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UofA ANSYS Tutorial ANSYSUTILITIES
BASICTUTORIALS
INTERMEDIATETUTORIALS
ADVANCEDTUTORIALS
POSTPROC.TUTORIALS
COMMANDLINE FILES
PRINTABLEVERSION
Creating Files
Features
Basic Tutorials
Intermediate Tutorials
Advanced Tutorials
PostProc Tutorials
Radiation
Index
Contributions
Comments
MecE 563
Mechanical Engineering
University of Alberta
ANSYS Inc.
Copyright © 2001University of Alberta
ANSYS Command File Creation and Execution
Generating the Command File
There are two choices to generate the command file:
1. Directly type in the commands into a text file from scratch. This assumes a good knowledge of the ANSYS command language and the associated options.
If you know what some of the commands and are unsure of others, execute the desired operationfrom the GUI and then go to File ‐> List ‐> Log File. This will then open up a new windowshowing the command line equivialent of all commands entered to this point. You may directlycut and paste from here to a text editor, or if you'd like to save the whole file, see the next item inthis list.
2. Setup and solve the problem as you normally would using the ANSYS graphic user interface(GUI). Then before you are finished, enter the command File ‐> Save DB Log File This savesthe equivalent ANSYS commands that you entered in the GUI mode, to a text file. You can nowedit this file with a text editor to clean it up, delete errors from your GUI use and make changes
as desired.
Running the Command File
To run the ANSYS command file,
save the ASCII text commands in a text file; e.g. frame.cmd
start up either the GUI or text mode of ANSYS
GUI Command File Loading
To run this command file from the GUI, you would do the following:
From the File menu, select Read Input from.... Change to the appropriate directory where thefile (frame.cmd) is stored and select it.
Now ANSYS will execute the commands from that file. The output window shows the progressof this procedure. Any errors and warnings will be listed in this window.When it is complete, you may not have a full view of your structure in the graphic window. Youmay need to select Plot ‐> Elements or Plot ‐> Lines or what have you.Assuming that the analysis worked properly, you can now use the post-processor to view elementdeflections, stress, etc.If you want to fix some errors or make some changes to the command file, make those changes ina separate window in a text editor. Save those changes to disk.To rerun the command file, you should first of all clear the current model from ANSYS. SelectFile ‐> Clear & Start New.
Then read in the file as before File ‐> Read Input from...
Command Line File Loading
Alternatively, you can also read in the command file right from the ANSYS command line. Assumingthat you started ANSYS using the commands...
/ansys52/bin/ansysu52
and then entered
/show,x11c
This has now started ANSYS in the text mode and has told it what graphic device to use (in this case an
X Windows, X11c, mode). At this point you could type in/menu,on
, but you might not want to turn onthe full graphic mode if working on a slow machine or if you are executing the program remotely. Let'sassume that we don't turn the menu mode on...
If the command file is in the current directory for ANSYS, then from the ANSYS input window, type
/input,frame,cmd
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and yes that is a comma (,) between frame and cmd. If ANSYS can not find the file in the currentdirectory, you may need to point it to the proper directory. If the file was in the directory,/myfiles/ansys/frame for example, you would use the following syntax
/input,frame,cmd,/myfiles/ansys/frame
If you want to rerun a new or modified file, it is necessary to clear the current model in memory withthe command
/clear,start
This full procedure of loading in command files and clearing jobs and starting over again can becompleted as many times as desired.
ANSYS Command Groupings
ANSYS contains hundreds of commands for generating geometry, applying loads and constraints,setting up different analysis types and post-processing. The following is only a brief summary of someof the more common commands used for structural analysis.
Category Command Description Syntax
BasicGeometry
k keypoint definition k,kp#,xcoord,ycoord,zcoord
l straight line creation l,kp1,kp2
larc circular arc line
(from keypoints)larc,kp1,kp2,kp3,rad(kp3 defines plane)
circle circular line creation
(creates keypoints) see online help
spline spline line through keypoints spline,kp1,kp2, ... kp6
a area definition from keypoints a,kp1,kp2, ... kp18
al area definition from lines a,l1,l2, ... l10
v volume definition from
keypoints
v,kp1,kp2, ... kp8
va volume definition from areas va,a1,a2, ... a10
vext create volume from area
extrusion see online help
vdrag create volume by dragging area
along path see online help
SolidModeling(Primitives)
rectng rectangle creation rectng,x1,x2,y1,y2
block block volume creation block,x1,x2,y1,y2,z1,z2
cylind cylindrical volume creation cylind,rad1,rad2,z1,z2,theta1,theta2
sphere spherical volume creation sphere,rad1,rad2,theta1,theta2
prismconetorus
various volume creationcommands
see online help
BooleanOperations
aadd adds separate areas to create
single area aadd,a1,a2, ... a9
aglue creates new areas by glueing
(properties remain separate) aglue,a1,a2, ... a9
asba creat new area by area
substraction asba,a1,a2
aina create new area by area
intersection aina,a1,a2, ... a9
vaddvlguevsbv
volume boolean operations see online help
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vinv
Elements &Meshing
et defines element typeet,number,typemay define as many as required;current type is set by type
type set current element type pointer type,number
r define real constants for
elements
r,number,r1,r2, ... r6may define as many as required;current type is set by real
real sets current real constant pointer real,number
mp sets material properties for
elements
mp,label,number,c0,c1, ... c4may define as many as required;current type is set by mat
mat sets current material property
pointer mat,number
esize sets size or number of divisions
on linesesize,size,ndivsuse either size or ndivs
eshape controls element shape see online help
lmesh mesh line(s) lmesh,line1,line2,inc
or lmesh,all
amesh mesh area(s) amesh,area1,area2,inc
or amesh,all
vmesh mesh volume(s) vmesh,vol1,vol2,inc
or vmesh,all
Sets &Selection
ksel select a subset of keypoints see online help
nsel select a subset of nodes see online help
lsel select a subjset of lines see online help
asel select a subset of areas see online help
nsla select nodes within selected
area(s) see online help
allsel select everything
i.e. reset selection allsel
Constraints dk defines a DOF constraint on a
keypoint
dk,kp#,label,valuelabels:UX,UY,UZ,ROTX,ROTY,ROTZ,ALL
d defines a DOF constraint on a
node
d,node#,label,valuelabels:UX,UY,UZ,ROTX,ROTY,ROTZ,ALL
dl defines (anti)symmetry DOFconstraints on a line
dl,line#,area#,labellabels: SYMM (symmetry); ASYM(antisymmetry)
Loads fk defines a fk,kp#,label,value
labels: FX,FY,FZ,MX,MY,MZ
f defines a force at a node f,node#,label,value
labels: FX,FY,FZ,MX,MY,MZ
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