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Fr 17. Jul 10:52:59 CEST 2020 in Munich (Germany),
written by Klaus Wittig (klaus.wittig@calculix.de)
cgx Change Log
================
NOTE: This document is potentially incomplete.
cgx 2.16.1 -> cgx 2.17
---------------------
o In addition to 'netgen' the tetmesher 'tetgen' can be used.
Default is 'tetgen'.
o Changed or extended commands:
- asgn The default tetmesher can be set (tetgen, netgen)
- asgn The default method used for the scale can be chosen:
max,maxr and maxc, minc together with a color.
- comp Option 'c' adds related combined lines to sets (LCMB's)
- eprop Calculation of a quality measure for tets (flatness).
- proj Normal projections to all types of shapes implemented.
- qdis Normal distance to a plane defined by 3 nodes or points.
- setr Remove only certain classes of lines from given set. Known
are 'l' straight lines, 'a' arcs, 'n' nurbs, 's' splines.
o New commands:
- maxc As maxr but the color above the defined value is set to
a user defined color (default 'neutral')
- minc As minr but the color below the defined value is set to
a user defined color (default 'neutral')
cgx 2.16 -> cgx 2.16.1
---------------------
o Command line can be shown in the graphic's window. Can be switched on or
off via menu or command.
o Changed or extended commands:
- qmsh The functionallity of qbia added.
- qseq Combination and substitution of several lines by one spline.
Selection of a single line or several lines must now be finished
by a 'g' keystroke!
- plot/ Potential node positions can be shown. The combined effect of
plus lp, ld, lc is available with lc.
- view Add a command line in the graphic's window (view cl)
o New commands:
- capt Change the captation from the default filename to a user
defined string
cgx 2.15 -> cgx 2.16
---------------------
o Transparency (blending of colors) implemented and available via
menu or command line for elemet faces.
o Multi-threading implemented for meshing, mapping and the 'cut' command.
o Improved 2D unstructured meshing (pre-requisite for 3D tet meshing).
o The frd format specification is extended by a double precision binary
format.
o Changed or extended commands:
- asgn: The number of cpu threads can be chosen.
Default is currently '4' when cgx is started with '-a'
and otherwhise '1' since the mesh numbering would be different
each time the 'mesh' command is used with more than '1'
threads (defined in cgx.h 'NTHREADS').
The user may use this command in his personal '.cgx'
config file to define the nr of threads to be used.
- ds: Uses parameter 'f' to finalize the current dataset. This triggers
a new calculation of the max/min values of the current dataset.
- hcpy The default name of the hcpy file and the running number of
that type of file is written to the stack if requested. Or the
user may specify the base name of the hcpy file.
- neigh Extended functionality and faster execution.
Writes *EQUATION, *TIE and *CONTACT formulations to be ready for
use.
- plot/ The numerical values at nodes are now presented with option 'nn'
plus instead of 'nv'. The option 'nv' is now used to present the values
at the nodes using colors in the same way as with 'fv' or 'ev'.
with 'f' and 'v' for illuminated faces or results
(ie. fvb).
- plot/ Transparency can be chosen with parameter 'b' together
plus with 'f' and 'v' for illuminated faces or results
(ie. fvb).
- qmsh The mesh type can be switched between unstructured and
structured with key 'x' (the structured tr6 will be used after
pressing 'x' if no elemtype was assigned so far)
- read Reading of double precision binary formated results. Nevertheless
the results are stored in single precision data fields.
- read In case a file written in an un-common format should be evaluated
the user may read the file into the cgx stack memory. From there
it can be parsed in a while loop using 'valu' commands.
- txt User defined texts can be assigned to a single- or set of nodes.
- valu/ Values with a leading '!' in the name are not written to
val the fbd file.
- view Add a ruler bar to the graphic with parameter rul and optional
the unit.
o New commands:
- col: User defined new colors which can be used with plot/plus.
The user may use this command in his personal '.cgx'
config file.
cgx 2.14.1 -> cgx 2.15
---------------------
o Changed or extended commands:
- ds: when only a dataset is specified and no entity then informations
including the number of entities is written to stdout and
eventually to the stack. Usefull when the existing ds
has to be evaluated in a batch file.
- elty: B31R added (be2r), B32R added (be3r).
- mshp: Sets the mesh parameters for individual lines as well.
- movi: Movies loop now automatically. The number of loops can be set
with parameter 'loops'. Default is infinite loops.
- node: A flag (0|1, def:1) can be used to force or skip the update of
related entities. Using '0' speeds up the command significantly.
- node: The value of the currently selected entity and dataset of a
given node can be manipulated by using the option 'vs' instead
of 'v'.
- rot: The model is rotated in a way that the viewing direction is
in normal direction at the location of a given node (parameter
'n'). Either a node-nr or a set with one node can be given.
- send: With option 'raw' instead of 'names' only the node- or element
numbers will be written to a file without a preceding *NSET or
*ELSET command.
- send: With option 'f' after 'fbd' the point coordinates will be
written in long float (double) format instead of the default
exponential format. Usefull when otherwhise a '0.' is not
exactly zero.
- test: Tests the observability ('o') of a certain node under the given
orientation of the model. The node can be given as a member of a
set or directly by its node-nr. The command returns TRUE or
FALSE and writes this to the stack.
o New commands:
- neigh: Finds neighboring element faces which can be used in a *TIE or
*CONTACT PAIR formulation
-else if:Extention to the 'IF' command.
- val: Has the same functionallity as 'valu' but the arguments will be
substituted by the command parser by eventually defined values
(the substitution can be suppressed with a leading '\' before
the argument).
REMARK: Substitution by the command parser does not take place
when the 'valu' command is used. The command uses his own
substitution rules. This results in a nested substitution for the
'val' command.
cgx 2.14 -> cgx 2.14.1
---------------------
o To prevent the user from executing potential dangerous 'sys' commands
the program will stop executing 'sys' commands unless the user accepts
either each single one or accepts the execution of every 'sys' commands.
If this functionallity is not desired then change "ALLOW_SYS_FLAG 0" in
the cgx.h file to "ALLOW_SYS_FLAG 1".
cgx 2.13 -> cgx 2.14
---------------------
o Updated cgxCadTools written by Pascal Mossier:
Sets are generated when colours are applied to surfaces or volumes. This
sets are named by the rgb fractions: r<val>g<val>b<val>
o The in-build programming language is somewhat simplified since constant
values are now supported. So far any value had to be initialized with a
'valu' command. Now constant numbers like '-1' or strings can be used
directly.
o Creation and manipulation of Datasets are supported.
o The animated deformations work now as well for the cylindrical system
(see 'trfm').
o Changed or extended commands:
- copy: The 'normal' transformation was added.
- ds: Datasets can be created.
- ds: Dataset parameters can be changed and created.
- ds: node results can be re-calculated using an exponent.
- elem: Shell-elements can be created based on element-faces.
- elty: C3D10T added (te10t).
- enq: The search in cylindrical coordinates did not regard the
circumferential position so far. The syntax has changed and
allows now the specification of the circumferential position.
- flip: Inverses the orientation of a set of elements.
- if: Constant strings and numbers are supported.
- move: The 'normal' transformation was added.
- node: Values can be defined or redefined on the current active
dataset.
- send: Write the current state in a special file 'init.fbl' which can
be used in other sessions to get the same view of a second model.
- swep: The 'normal' transformation was added. Good to create a layer
of thin elements on a given mesh.
- valu: Constant strings and numbers are supported. Therefore there is
no longer a need to define a valu for every number or string.
- while: Constant strings and numbers are supported.
- wsize: The size of the window can be set even in batch mode as long
as this is the first command!
o New commands:
- init: This command defines the window and model size, the model
position, rotational center, fonts and others.
cgx 2.12 -> cgx 2.13
---------------------
Emphasis was placed to post-processing:
o WARNING: The command "prnt se <set>" writes now 13 leading values to
the stack.
o Shaded representation of results can be switched on by command or menu.
o The user can add his own functions and scripts to the menu.
o A file (.cgx) with initialization commands will be read at startup
from the home directory. Useful to add functions to the menu.
o The front face culling works now for the entities drawn by plot and
plus.
o Changed or extended commands:
- elem: Automatic number generation by using '!'.
- frame: A setname can be provided as a size target.
- node: Automatic number generation by using '!'.
- plot: The pixel width of some entites can be specified.
- plus: The pixel width of some entities can be specified.
- prnt: In combination with "stack on" writes the number of entities
of a set to the stack. Existing scripts need a
"valu x pop 13" after "prnt se <set>".
- prnt: Lists failed elements regarding quality (eq).
- text: This command was renamed to 'ulin' (underline).
- valu: User input can be requested by '?'.
- view: The pixel width can be specified when using the parameter
'point'.
o New commands:
- maxr: 'max' with one more color box above the specified value.
- minr: 'min' with one more color box below the specified value.
- menu: The user can add his own functions and scripts to the menu.
- ulin: Replaces the command 'text'.
- thrs: Displays regions which values of the actual dataset are
above (h) or below (l) the given value.
- txt: Creates node-attached texts (as qtxt).
- wsize: The size of the window can be set.
- wpos: The positon of the window can be set.
cgx 2.11 -> cgx 2.12
---------------------
o Much faster unstructured shell element mesher. CAD-model meshing is much
improved in combination with some improvements of the 'qmsh' command and a
new stand alone step and iges interface. This stand alone tool uses the
openCascade library.
o The pnt commands written into the fbd file use now more digits
for a higher accuracy.
o Changed or extended commands:
- elty: Reduced- and full-integrated forms of various quad shell element
types can be selected now (ie. 'qu8r'|'qu8er'|'qu8sr'|'qu8cr').
- gtol: New parameter 'gtol auto' to recalculate the geometric
tolerance. This was done before by just typing 'gtol'. Now
'gtol' w/o parameters just prints the actual geometric tolerance.
- nurs: Apart from surfaces using four edges now also surfaces using 2
or more edges can be converted to nurbs based surfaces. The
nurbs will follow the initial blended contour. Such surfaces
are needed for unstructured meshes.
- prnt: Informations about the model with 'info' (nr of entities etc.).
- prnt: Actual stack size with 'stack size'.
- prnt: Enquire the alias name of an entity by placing a '?' before the
name.
- qmsh: Changing a line division causes an automatic re-mesh at this
location.
- qmsh: A change of the surface mesh density can be triggered by a
'h' and 't' key-stroke which causes an automatic re-mesh of the
surface.
- read: The parameters are written to the stack.
- shpe: A torus is now available.
- swep: Rotational sweeped lines create nurbs related surfaces if
requested (option 'n').
- valu: Strings can be splitted at the occurences of a defined
character.
o New commands:
- eprop: Calculates the element edge length and volume. Usefull for cfd
and explicid dynamic mesh improvements.
- seqc: Converts an LCMB into a spline. keeps the sum of divisions but
sets the bias to 1.
- mshp: Sets the mesh parameters for individual surfaces and bodies.
cgx 2.10 -> cgx 2.11
---------------------
o Changed menu function:
In the previous versions of cgx the "vMises" strain was calculated with
the same algorithm as used for the vMises stress. This is now corrected to
vMises_strain=2./3.*stressAlgorithm
o Changed or extended commands:
- elty be2f,be3f elements for fluid networks (ccx: *ELEMENT,TYPE=D).
- send: parameter 'cr'<temp|node> for cavity radiation conditions with
uniform emissivity and sink temperature or sink node is available.
o New commands:
- fil: Command line version of qfil.
- grpa: Assigns a group number to certain elements stored in a certain set.
The group number is an element attribute used in the frd file.
- int: Command line version of qint.
cgx 2.9 -> cgx 2.10
---------------------
o Changed or extended commands:
- anim: Option 'start' to start an animation added (implicit in most
related functions, therefore seldom needed).
- copy: Additional transformation options are available.
- ds: Sequences of datasets can be defined by just one dataset-nr.
The program recognizes the request when a 'h' key is
appended to the 'e' or 'a' keys which in turn define if the
fringe plots should use the deflected shape or not.
- ds: An offset can be added to the values of datasets.
- graph: Plotting any field results along a combined- or a single line
is supported. The division of the line determines the number
of new locations for data-points.
The current displayed results will be
automatically mapped to this locations and shown in a 2D
graph over the length of the line.
Unordered node sets can be used. They are automatically ordered.
- movi: The number of frames which will be saved before the recording
stops can be specified (option 'frames'). A given command
file will be executed after the movie is finished.
Alternatively instead of a given nr of frames the key-word
'auto' can be used to start recording of one period of an
animation or sequence. The program waits until the recording
is done and continues then with eventual subsequent comants.
- read: Time consuming dependency checks can be avoided by using the
parameter 'new' when reading frd files.
- send: The mass-flow in a cfd calculation can be written (mflow).
- swep: Triangle and Quad elements can be sweeped into wedges and hexa
elements. Results will be copied to the new nodes. The sweep
angle is not longer restricted to values <180 deg.
- swep: Additional transformation options are available.
- read: (Peter Heppel) The netgen file reader accepts quad-8
- read: (Peter Heppel) The netgen file reader accepts a keyword ndsb for
NoDeleteShells&Beams
o New commands:
- norm: Writes the normal direction of nodes to the konsole. The user
might store this values on the stack for further use.
cgx 2.8 -> cgx 2.9
---------------------
o The animation and sequence functionallity was improved.
- Previously only displacements could be animated by a sinus function
showing the deformed shape.
Now all kinds of datasets can be animated as a fringe plot with
deformed shape.
- Fringe plots of sequences of datasets using the related deformed shapes
are also supported now.
This functionallities are available over the menu or the "ds" command.
o Deformed element- and model-edges are used during animations. The user can
switch on additional undeformed edges as a reference over the "anim"
command or the "Animate" menu.
o Changed or extended commands:
- copy: More transformations are supported in case results have to be
copied as well (mir, rad).
- ds: The animation can now be used for fringe plots with or without
using the related deformations.
- max, A 3rd parameter "l" (lock) or "u" (unlock) can be provided which
min, locks the scale to certain max or min values. The selection of
mm: a different dataset will not change the scale (max 100 e l).
- prnt: List the contents of the stack (prnt st)
- read: Results from "openFoam", stl-files and netgen meshes (.vol) can
be read now during run-time.
- send: Boundary conditions for the new ccx-cfd finite volume code
can be written with the 'slidef' parameter. These are equations
which define the velocity direction parallel to an element
face (experimental).
- volu: The calculation of the element volumes was improved and is now
in accordance with the ccx solver since it uses the same
algorithms now.
o New commands:
- anim: Command which provides the functionallity of the "Animate" menu
cgx 2.7 -> cgx 2.8
---------------------
o This version shows some improvements of the batch
capabilities to support optimizations: 'loop' constructs,
case distinctions and variables were introduced. See 'while', 'if'
'test', 'stack' and 'value' for further details.
o Changed or extended menu functions:
In the previous versions of cgx the "maxShear" stress was named
"Tresca shear stress" in the menu. This was wrong since "Tresca" is
equivalent to 2*maxShear. Therefore "Tresca" is now renamed to "maxShear"
in the menu and the manual.
o Changed or extended commands:
- prnt: The content of 'values' can be printed (see 'valu').
- prnt: Existing 'user headers' stored in the ccx result files (frd)
can be listed and written to the stack.
- prnt: Existing 'parameters' stored in the ccx result files (frd)
can be listed and written to the stack.
- prnt: Nodal values and coordinates of nodes and points can be written
to the stack.
- proj: A tolerance for the maximum distance of a projection
can be defined.
- send: Boundary conditions for the new ccx-cfd finite volume code
can be written with the 'spcf' parameter for velocities,
pressure and temperature.
Cyclic symmetry mpc connections for cfd can be created with
'cycmpcf'.
- seta: 'values' can be added to a set.
- setr: 'values' can be removed from a set.
o New commands:
- break: Breaks the interpretation of a command file and returns to the
command line.
- dist: measures distances between entities of two sets. For example
between points or nodes stored in one set to surfaces or
shapes stored in a second set. The average-, maximum- and
minimum distance is determined. The distance is measured
normal-, rotational-, radial or translatoric. The command
works analogous to the 'proj' command.
- else: See 'if'
- endif: See 'if'
- endwhile: See 'while'
- if: A command to compare two values. If the compare is True
the following commands are executed. If the compare is False
the code after 'else' is executed. Strings and numbers can be
compared. Normal operation continues after 'endif'.
- stack: Several functions which return values to the user might now
place them also on a software-stack. The 'valu' command
is able to store this values from the stack in variables.
(stack used by area,dist,ds,enq,gtol,length,prnt,valu,volu)
- test: Tests the existence of a given entity. Returns TRUE or FALSE
and writes it on the stack.
- valu: A new entity which can store a string of characters or numbers.
The command parser will scan each parameter of each command for
expressions which match a value and will replace the parameter
by the value. The contend of the value can be defined by the
user or derived from commands or datasets.
The command is able to perform simple calculations, string
concatenation and format changes.
- while: A command to compare two values. If the compare is True
the following commands are executed until the 'endwhile'
command is found. This procedure is repeated until the compare
is False. Strings and numbers can be compared
cgx 2.6 -> cgx 2.7
---------------------
o The main goal of this version was the implementation of a tet-mesher.
The 2D-mesher was greatly improved as a basis for the netgen 3D-tet-
mesher. The netgen tetmesher (ng_vol) is not linked but used as a
stand-alone program started by a system call. This is not visible
to the user and has the advantage that cgx can still be build
independently. In addition any malfunction of ng_vol has no influence
on the stabillity of cgx. A modified version of ng_vol is included
and should replace the original ng_vol prg in the netgen source code.
The modified ng_vol allows the specification of a target size for the
size of the elements. But the apart from this feature the original
ng_vol prg from netgen works well and might be kept as it is.
See especially the command 'qmsh'.
o The restriction to a division of 99 as a maximum is not longer valid.
o Replaced commands:
- qele: Functionality included in qmsh
o Changed or extended commands:
- body: A multi-surface-body can be created by specifiing
a set of surfaces. This body can only be used for tet
elements.
- div: w/o arguments lists the defaults. In auto mode an element-size
-ratio can be specified (smallest/biggest).
- elty: w/o arguments lists the defaults. New elements:
tr6u unstructured tria with 6 nodes
te4 tet4 (netgen prg 'ng_vol' must be available)
te10 tet10 (netgen prg 'ng_vol' must be available)
- line: The restriction to maximum division is no longer valid.
The bias argument has to follow the division in the 'line'
command syntax if a division >99 is applied.
- mesh: "mesh <setname> tet [max-element-size]" creates a tet-mesh
based on an existing closed 2D mesh composed of trias.
This is a second method to generate tets. The first one is
to use 'elty' to asign tet-elements to bodies and to use
"mesh <setname>" to mesh all bodies in set <setname>.
- qdiv: Up to 3 digit divisions can be specified.
- qlin: The parameter 'e' allows the replacement of lines in lcmbs
or surface-definitions.
- qshp: A pre-defined shape-name can be provided.
's' attaches a pre-selected shape or nurbs.
'S' pre-selects a nurbs
'h' pre-selects a shape
'c' clears pre-selections
- qsur: A pre-defined surface-name can be provided.
's' selects a surface or attaches a pre-selected shape or nurbs.
'S' pre-selects a nurbs based on a surface-definition
'h' pre-selects a shape based on a surface-definition
'c' clears pre-selections
- seta: lines with a line-division greater as specified can be grouped
together "seta <setname> ld<x>" (ld: "line-division").
- shpe: A cylinder can be specified and used for the interiour def-
inition of a surface.
- surf: A multi-line-surf can be created by specifiing
a set of lines. This surface can only be meshed with tr3u or
tr6u in conjunction with a related shape (nurbs) if it is not
plane.
- view: The menu items 'FILL', 'LINE', 'POINT' and 'background colour'
are integrated.
o New commands:
- lnor: Generates a new line normal to a plane defined by 3 points.
(based on qnor)
- qmsh: Allows the manipulation of surface meshes.
- Based on identified lines or surfaces meshes can be deleted
and generated.
- Certain surfaces can be combined to get rid of very small ones.
- Certain surfaces can be splitted.
- The line-division can be changed.
cgx 2.5 -> cgx 2.6
---------------------
o Step reader is now able to deal with assemblies.
All single parts of an assembly will be written to separate files
if requested. A command-file for the assembly is then also provided.
This allows the user to generate single meshable models which will
then be assembled (cgx -stepsplit).
o Input file reader (ccx): Multiple load definitions inside one *STEP
on a single entity will now sum up (ccx compatible). This applies
to cflux, dflux, cload, dload.
o The nastran f06-file can be read (CHEXA, displacements and stresses)
at startup (option -f06).
o Changed or extended commands:
- asgn: Alternative parameters 'rbe' (with "alpha") or 'mpc' to force
a successive send (option areampc) command to write either
rbe's or mpc's (Nastran only).
- max,min: The number representation can be changed between int,float,exp.
- move: Points can be moved to nearest target points (param. equ).
- move: mirror, rotate or move-radial can be defined by one point and
a main-axis (x|y|z).
- move: The rotation-angle or radial-movement can be specified on two
axial positions, the target value for each point to be moved
will be calculated based on these two axial positions
- prnt: The range of nodes and elements of a certain set can be displayed
in addition holes in the numbering are detected.
- qadd: Collects connected element faces until a certain deviation
of the normal vector from the 1st picked face ist reached.
- read: Background pictures (still only xwd format) can be read with
a scaling factor.
- send: A simple text file (lst) to list node- and element-numbers
can be written (space separated, seven numbers per line)
- send: Certain entities of a certain dataset can be written
to a file.
- send: The option "mpc" will alternatively generate RBEs if
requested (nastan RBE2, abq *RIGID BODY).
- seta: Wildcards(*) can be used.
- setr: Wildcards(*) can be used.
- trfm: Option "rec" works now. In all cases the resulting entities
will overwrite the original ones. In this case successive
transformations are possible.
o New commands:
- csysa: Specifies the displacement coordinate system
(Nastran only)
- mm: Combines max and min in one command
- seql: Makes splines from lines
cgx 2.4 -> cgx 2.5
---------------------
o The drawing area does not longer keep its quadratic form when the window
size changes. Instead it will now change to a rectangular shape when
this allows a better use of the available window-area.
o A binary frd-format was created and can be used for reading and writing.
Ths reduces the storage space and leads to a speed increase.
o Changed or extended commands:
- comp: Wildcards(*) can be used to complete groups of sets of a
certain expression.
- del: Node attached "texts" can be deleted, see qtxt.
- enq: Nodes with values above or below a specified value can be
searched.
And a set with a point can be provided to specify a search-
location.
- graph: Wildcards(*) can be used for materials and amplitudes.
- map: Apart from 2D-to-2D and 2D-to-3D is now 3D-to-3D mapping
available. The mapping takes place for either all
or a specified dataset. All entities of the interpolated
datasets are regarded.
- plot/
- plus: Node attached "texts" can be displayed, see qtxt.
- prnt: Wildcards(*) can be used.
- qadd: Node attached "texts" can be generated and controlled.
- qdel: Node attached "texts" can be deleted, see qtxt.
- qenq: Node attached "texts" can be generated and controlled.
- read: Nodes and elements can be skipped to speed-up the reading of
input-files. This is usefull when a result file was read and
the pre-defined sets from the input file should be available.
This is default when cgx is started with an frd- together with
its inp-file.
- send: Node and element set-definitions can be written in gagemap
(gmp) or patran neutral format (pat).
- send: The binary frd-file format can be used to export data.
- send: The pressure-DOF can be specified for equations (areampc,
cycmpc).
- send: Second order elements (hex20,Pe15,Tet10) can be subdivided to
eight 1st. order elements each.
Syntax: "send <setname> abq quadlin"
- send: The additional enities generated by cgx can be written by
using the '+' sign after the 'ds' parameter (i.e. vMises).
o New commands:
- qtxt: Node attached "texts" can be generated and controlled.
This texts are attached to nodes and can be placed everywere
in the drawing area. They might show the node-nr and its value.
- sete: To enquire other sets which have entities in common or with
an identical content (depending on further parameters).
Example: "sete blade p min" searches for sets who store the
same or more points as "blade" (at least the set "all").
- seti: To generate an intersection of several set (what do the
specified sets have in common (of the specified entity-type)?)
Example: seti intersection_set p set1 set2 set3
cgx 2.3 -> cgx 2.4
---------------------
o Several speed improvements for example for mapping and mpcs
(*EQUATIONs).
o Better support of shell elements (POS, NEG can be specified).
o If netgen native mesh-format is read then the surface-patches of
the volume mesh are stored in sets ("+set[n]") and can be used for
boundary or load definitions (cgx -ng file.vol).
See the manual section: "Remarks Concerning NETGEN".
o The actual OpenFoam (1.7.1) format is now supported (read and write).
o The cfd-code dolfyn is now supported (thanks to Runar Tenfjord).
An example is included in the examples/dolfyn directory.
o The colour index mode is not longer supported.
o The menu entry "cut->vector" is introduced. See "cut" below.
o All principal stresses can be displayed with vectors.
o Changed or extended commands:
- cut/ A section can be created based on the selection of just
qcut: one node if a dataset and entity of a vector was selected
(disp, PS, worstPS ..)
- elty: Plain strain/stress and axisymmetric elements can be
specified.
- read: Result-files (frd) can be read during run-time in a way
that node- or element-numbers already in use will not be
overwritten (option 'add'). Instead new numbers are generated.
Existing datasets will be extended by the new node-numbers.
The optional parameter 'ext' will not change element or
node numbers but as with 'add' will extend existing
datasets by the new nodes.
If result-files are read without the option 'add' or 'ext'
then new Datasets are just added to the existing ones.
Element or node numbers are not changed.
- send: Mapping of surface-loads from one mesh to another one is
no longer supported (option 'surfmap'). A new command 'map'
is introduced for this functionallity. The mapped results
can then be 'send' as usual.
- send: The actual openfoam format (1.7.1) is now written.
- send: The actual darwin format (7.1) is now written.
- send: Writes mesh and BCs for the cfd-code dolfyn (thanks to Runar
Tenfjord).
- send: A netgen surface mesh can be written based on the faces of
elements. The faces of hex, tet, quad and tria elements are
triangulated and written in the stand-alone netgen mesher
format (file.ng). The mesher can be found in the netgen
sub-directory nglib and is named ng_vol.
- send: stl-format will now be written based on the faces of
elements. The faces of hex, tet, quad and tria elements are
triangulated and written in ascii-stl.
- send: The side of shell elements can be specified with an
additional parameter (+|-) when writing BCs.
- split: Tet-meshes can be splitted by surfaces, faces or shapes.
o New commands:
- map: Interpolates values at nodes from one mesh to another. For
example pressures from a cfd calc to the structure mesh.
See also remarks in the manual "How to map loads".
- sys: External shell commands can be issued. For example to move
files created by the 'send' command to certain file names
or/and locations.
cgx 2.2 -> cgx 2.3
---------------------
o The Datasets are bundled to loadcases if more than one loadcase is
defined (a loadcase is a certain bundle of datasets for which the
loads and boundary-condition are unique). It influences only the
menu structure. To define a dataset the user has to move the pointer
through a loadcase.
o The special keys PAGE_UP and PAGE_DOWN are now also used to scan
through Datasets of different Loadcases in a fast way. For example:
If displacements were selected a PAGE_DOWN will display the next
displacement dataset.
o Parameters in the result-file a now supported. These are values
related to datasets which give additional information for the loadcase.
They can be displayed with the graph command or with the menu
(ccx result-files (frd) usually do not contain meaningfull parameters).
See the manual section: "Parameter Header Record"
o A new entity called Shape is introduced. It allows the definition
of planes for projection purposes or to define the interiour of
surfaces (necessary for the 2D unstructured mesher, element-type
tr3u). Other types are planned.
o Reading of ccx-input files is improved:
- Sets which are used in contact pairs reference each other.
- Forces are automatically transformed in the basic coordinate
system.
- Sets can now be referenced before they were defined.
o A new parameter -bg will suppress the graphic window. Usefull for
pure batch mode.
o Speed improvements for the graph command.
o Improved step-format reader. Most types of lines are now supported.
But still only points and lines are supported.
o Netgen native mesh-format can be read. By this way the netgen-sets
will be available if the command "mats" is used in addition.
See the manual section: "Remarks Concerning NETGEN".
o Mapping of surface-loads is supported. See the manual section:
"How to map surface loads".
o Changed or extended commands:
- graph: Now parameters related to datasets can also be used for
the graph command.
- qseq: Is now also able to define a sequence of nodes or points.
Such a sequence of nodes can be used to plot values with
the graph (option "l") command. It replaces the equivalent
function "qadd set s". Sequences can be listet with "prnt sq"
- qsur: Unsorted lines can be picked with the "l" key to define a
surface only meshable with unstructured triangles (elty tr3u).
This surface permits holes in it. The surface has to be plane
or a suited NURBS has to be referenced.
- send: Will write nodes sequences in fbd format. This file can be read
again to define this sequence in another cgx-session.
- send: Mapping of surface-loads from one mesh to another one is now
supported (option surfmap), see also remarks in the manual
"How to map surface loads".
- seqa: Node sequences can be defined (as qseq, for the graph command)
o New commands:
- enq: Enquires entities (and values of a pre-selected dataset) at a
given position .
- flip: Changes the orientation of a set of surfaces or a single surface.
In case of a single surface with the parameter optional ``auto''
all surfaces will be flipped in a way that they share a common
direction (in or out of a volume)
- qshp: used to define a shape. A shape needs 3 points for its definition.
The points are selected with the 'p' key. After the points are
selected it will be generated by a 'g' keystroke. The shape can
be assigned to a surface by selecting the surface with the 's'
key. The shape will then define the interiour of this surface.
- shpe: Create a shape which can be used to define the interiour of
surfaces or to be used as a target for projections (see qshp).
- ucut: This command will delete a previous created section (cut) and
display the un-cutted structure.
cgx 2.1 -> cgx 2.2
---------------------
o The target for this version was in general to improve the menu-
functionality for post-processing.
o The special keys PAGE_UP and PAGE_DOWN are now used to scan fast through
sets. The entities of the previous or next set will be displayed. The type
of entity is used as in the last plot or plus command. In other words: If
you have displayed the nodes of set1 and you press PAGE_DOWN you will see
the nodes of set2 instead of set1 etc.
o The vector-plot option "Viewing->Toggle Vector Plot" will now take
immediate effect if a suited entity is already in use.
o This is also true for the "Viewing->Toggle Add Displacement" menu
function.
o After "Animate->Dataset Sequence" just one Dataset might be specified
before the entity is selected. The animation will then use all Datasets
with this name starting from the selected one. A constant spacing between
the Dataset is now not longer required.
o The commands qcut, qenq and graph are now included in the menu. But
with less functionality.
o Changed or extended commands:
- copy: Nodes and Elements can now be copied together with their
results. This is helpfull for calculations which use cyclic-
symmetrie. For example if just a segment of
a rotor was calculated but additional sectors with results should
be displayed. It can be used in combination or instead of the
parameter "NGRAPH" from the ccx-keyword *CYCLIC SYMMETRY MODEL
- copy/swep:
Existing sets are appended by the new build geometry only on
demand. The letter "a" (append) must be the last parameter to
request this functionallity. Otherwhise the new geo is appended
only to the target-set and the set default set "all".
- graph: The first and last dataset can be specified in addition to
restrict the range of datasets.
- plot/plus:
If "Viewing->Toggle Vector Plot" is active then nodes will be
displayed with arrows if the current entity belongs to a vector.
- prnt: Wildcards (*) can be used to search for setnames of a certain
expression.
- send: To write result files in darwin format (life evaluation software)
- send: Writes forced displacements normal to element-surfaces
(the components of the vectors at the node positions
can be scaled individually (fac1-3)). This is usefull to
define an offset to the geometry. A subsequent calculation
with ccx will move the mesh accordingly. After solving the
deformed mesh can be written and used as a new mesh.
With this procedure geometric variations are possible without
manipulating the geometry (morphing).
- send: Single Datasets can now be written in frd format by specifying
the dataset-nr.
send <setname> frd ds <datasetnr>
- tra: The command uses now model dimensions and the additional param-
eter "f" will move the mesh forward (towards the user and towards
the clipping plane). When the mesh penetrates the clipping-plane
the front part of the model will be clipped (same functionality
as the menu function "Viewing->Toggle Move-z/Zoom")
- trfm: Transforms vectors of the current dataset from cylindrical
to the basic cartesian system.
Usefull if vectors (forces etc.) in the
input-file are specified in a cyl-system but they should be
visualized with the menu option "Viewing->Toggle Vector Plot"
Because in this case the data must use the basic cartesian system.
- trfm: The first and last of a range of datasets can be specified.
Only the first dataset is regarded if no last dataset is
specified. As before the current dataset is selected if no dataset
at all is specified.
cgx 2.0 -> cgx 2.1
---------------------
o The target for this version was in general to improve the batch-
functionality.
o A Result-file can be read during run-time and replaces the existing data.
o The way result-files are read has changed. Up to now the results were read
before the user-interface started. Now only the meta-information
(dataset-name etc.) is read at startup but the node-values are read only
if a certain dataset is requested. In this way the program starts much
faster and the memory-requirement is lower if not all data are viewed.
o Stress-components in the directions of a cylindrical system around the
x-axis are not longer computed automatically for all STRESS datasets.
Instead a new command "trfm" was implemented.
o The command name lc has changed to ds (dataset).
o Changed or extended commands:
- copy/send: Existing sets are extended by the copied/sweeped entities.
- ds: is now "ds".
- del: "del l0 setname" will delete all lines with zero lenght.
"del se0" deletes all empty sets
- mids: Generate or delete midside-nodes.
- plot/plus: Plot lines with their end-points "plot lp set"
- proj: Moves now points and nodes to surfaces or element-faces.
- qlin: The key "x" will transform any line into a straight line and
the "e" key allows the modification of a lcmb w/o destroying
related entities like bodies.
- read: Now also result-files can be read during run-time and will
replace existing meshes and results. This allows batch-jobs
for post-processing.
- send: A so called "press-fit" connection between meshes can be created.
It is based on equations with a forced deflection.
- send: To write frd-files with results needs now the parameter ds.
Otherwhise only the mesh is written.
o New commands:
- cntr: Define new rotational center of the drawing (as qcnt).
- cut: Create a section through the mesh (as qcut).
- ds: Was former "lc". Explicidly the last or last-<nr> of dataset
can be selected now.
- font: Defines the font to use in the drawing- and legend-window.
- qfil: Creates a fillet between two intersecting lines.
- qint: Extend two lines to their intersection-point.
- view: Controlls several viewing options like element-edges on/off etc.
- trfm: Transforms displacements and stresses of the current dataset
in a cylindrical system.
cgx 1.8 -> cgx 2.0
---------------------
o Now 2D-step files can be read. Points and certain types of lines are
implemented. It was tested with files produced by UG-NX5. The
parameter -step is necessary during startup of cgx.
o The reading of abaqus input files is improved. Initial PLASTICSTRAIN
can be read.
o Changed or extended commands:
- elty: he8f for fluid calculations (ccx element F3D8)
- graph: Parameter l (length) to plot values along the length of a
set of nodes. This set has to be a sequence-set ( see qadd)
- lc: new parameter s to scale all values of a certain dataset or of a
range of datasets
- qadd: Parameter s to indicate that the set has to maintain the
sequence of the picked entities. This is used by the graph
command.
- qpnt: Parameter n to indicate that the coordinates of the picked node
should be used to create a new point.
- send: Now with the parameter lc not only temperature-values can be send
into a file instead also velocity and pressure. With this values
ccx can be restarted for a cfd calculation (ccx command *INITIAL
CONDITIONS). The created files have the extension '.dat'
(former .tem) and the mesh is not longer written in this case.
cgx 1.7 -> cgx 1.8
---------------------
o The copy and swep commands did not copy nurbs so far. Now it does.
o The reading of abaqus input files is improved. Initial stresses
can be read.
o Changed or extended commands:
- graph: Now it is not longer necessary to define a sequence of Datasets
before the graph command can be used. It is possible to define
the common part of the Dataset-names and the entity which should
be plotted (ie. graph nodes t DISP D1).
- plot, plus:
Bad elements will be shown with the parameter "eq"
- proj, copy, swep:
Now the parameters rad and rot can both use either two points to
define the rotational axis or just one global axis (x,y,z)
- qdis: Angles between two points (p) relative to one centerpoint (c)
can be measured.
- qlin: A line can be lenghted or shortened by picking the line (l) and
then one end-point (p) which should be moved.
- seta: A mesh referenced by a setname and consisting of independend
meshes can be separated into several new sets.
The setnames are generated automatically (seta ! <set>).
o New commands:
- qnor: A new line normal to a plane defined by three points is
created.
- eqal: Some element quality parameters can be defined. The elements
will be checked against this parameters either with the menu-
option "Show Bad Elements" or with the "plot" command. The
parameters are stored in the fbd file.
cgx 1.6 -> cgx 1.7
---------------------
o The hardcopy code is changed. Now it does not use "xwd" any more and
works also for other systems than Linux (thanks to Jeff Baylor).
o The Coefficients for *EQUATION and the *NODE vectors are written with
more digits. This improves results for "glued" meshes.
o The maximum Shear-Stress (Tresca) is computed automatically for all
STRESS datasets.
o Stress-components in the directions of a cylindrical system around the
x-axis are computed automatically for all STRESS datasets.
o The compressor in the examples-dir comes now with a fillet between disk
and blades. The stress-distribution is now more realistic.
o Changed commands:
- copy: option "scal" is changed, see "move".
- del: a background picture can be removed
- mids: midside nodes can be repositioned in a linear way.
- move: scaling can be performed to a reference point.
- proj: Normal projection for all types of surfaces.
- qpnt: A point can be moved also to a NURBS along the surface-normals.
- read: If a pixel-file in xwd-format of a certain geometry is available
it can be included as a background-picture. The user can then
create geomety based on this picture.
- send: a forced deflection for spc's (boundary) can be specified.
- swep: option "scal" is changed, see "move".
cgx 1.5 -> cgx 1.6
---------------------
o Capabilities of the command-line are improved. A command history is
realized.
o Entity-names might be as long as 255 characters now.
o The sets are selectable by index and by names.
o IMPORTANT! Since openFoam-version 1.3 uses a new format it is required to
convert the resulting files. See section "Remarks Concerning OpenFOAM"
in the manual.
o New commands:
- length: calculate the length of all lines stored in a set
- mids: correct the midside nodes of higher order elements stored in a set
- split: split lines and to create points on surfaces included in set1
where they cross surfaces from set2
- tra: This keyword is used to translate the model on the screen
- zoom: This keyword is used to zoom into the model on the screen
o Changed commands:
- graph: Displays also material-properties and amplitudes
- prnt: Prints also material-properties and amplitudes
- proj: Normal projection now possible
- nurs: Nurbs can be created based on existing surfaces following the
Coons-algorithm
- send: Write temperatures with step-information with reference to
a cload-file
- send: thermal connection between parts
- send: sliding equations (mpcs) between parts
- send: gap-elements can be defined
cgx 1.4 -> cgx 1.5
---------------------
o IMPORTANT! The definition of the line-bias has changed. One decimal digit
is now supported. A program parameter exists (-oldbias) to convert pre
v-1.5 models.
o IMPORTANT! The node-numbering has changed. A mesh will have a
differend node sequence than a pre-1.5 mesh. The mesher has now some
parameters who control certain aspects of the mesh, see the mesh command.
o ISAAC is now supported (a CFD-3D solver). A mesh can be created and
results can be visualized.
o All geometric operations are now performed with double precission instead
of float. Results use still float to save space.
o New commands: