I have a large number of multi-body parts in my simulation. I need to select all of the solids to modify their details behavior. If I use the shift key I get both parts and solids. I can use a combination of shift and control keys but the procedure is tedious when there's a large number of parts. What's the alternative? |
A simple way to get all the solids in the tree highlighted so their detail windows can be modified as one is the following:<br><br>1. Go to "Edit > Select... |
Can I apply an acceleration (or gravity) in an axisymmetric analysis? |
If the acceleration is in the Y-direction, then you can simply apply ACEL,,# in an axisymmetric analysis. If the acceleration is in X or Z, you would need to use Plane25, the... |
How can I use a phase pair variable in a CEL expression in CFX-5.7.1? |
i) Extract the VARIABLE definition from the variable file and add the line 'General Availability = CEL', then include this in the LIBRARY section of your CCL. None of the phase pair... |
I have just installed CFX-5.7.1 onto my master and slave PCs (Windows platforms) and when I try running PVM distributed parallel I get the following error:
+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| Unable to start the PVM daemon on host host_name. This may indicate |
| that the PVM daemon is already running on that host, or that it |
| left files in /tmp on that host because it did not exit cleanly |
| last time it was run. |
+--------------------------------------------------------------------+
I can run both PVM and MPICH locally in parallel. The command "rsh host_name cmd /c set" returns the environment variables of the slave machine called host_name, as it should.
When the run finishes a file called pvml.pid is left in the temporary directory on the master which looks like the following:
[pvmd pid1412] parsehost(): unknown option "IncCFXSharedpvm3.4.4_11-1libWIN32pvmd3.exe"
[pvmd pid1412] parsehost(): unknown option "FilesANSYS"
[pvmd pid1412] readhostfile() d:testTestnew_019.dirPVMhosts 2: errors
[pvmd pid1412] parsehost(): unknown option "IncCFXSharedpvm3.4.4_11-1libWIN32pvmd3.exe"
[pvmd pid1412] parsehost(): unknown option "FilesANSYS"
[pvmd pid1412] readhostfile() d:testTestnew_019.dirPVMhosts 3: errors
[pvmd pid1412] readhostfile() d:testTestnew_019.dirPVMhosts: 2 errors in hostfile
[t80040000] PC1234 (10.200.36.67:1296) WIN32 3.4.4
[t80040000] ready Mon Jan 17 14:44:22 2005
[t80040000] startack() host PC1304 expected version, got "PvmCantStart"
[t80040000] dm_halt() from (PC1234), halting...
[t80040000] work() pvmd halting
[t80040000] pvmbailout(0) |
This is a known problem on Windows platforms and it is listed in the CFX-5.7.1 Release Notes which can be found in the CFX-5.7.1 help documentation. When CFX-5.7.1 is installed in the default... |
How to calculate heat transfer coefficient based on bulk inlet temperature?
**** Entered By: emwillia @ 01/28/2005 11:05 AM **** |
There is an expert parameter, described below that will get you the info. If for an existing res file, you'll have to set the expert parameter in Pre, then re-run your solution for a... |
The CFX-5 Solver uses a license from a license file which is not on my license server. This license file is always found and the keys are used. Even when my license server is down. All PCs are in a network, all have OS WIN XP SP 2. The LM_LICENSE_FILE is set in order to direct the license request to my license server, but this does not happen. |
FlexLM uses several entries in the Registry, which seem to have a higher priority, so that the actual environment variables have no effect.<br><br>The solution... |
QUESTION
Defining a temperature in a Workbench Simulation model and writing out an ANSYS input file, one finds that the thermal load is applied as a D command and not as a BF command. It appears that the only way to do calculate thermal stress due to an arbitrary temperature distribution is to request BOTH a thermal analysis AND a structural one, which workbench seems to do automatically when both thermal and structural BC's are applied.
But suppose I wish to apply the temperature distribution (as a body load) in Workbench and skip the thermal analysis. How can this be done?.
ANSWER:
I don't know of a direct way to do this in WB but it would be quite simple using command objects. You can make a named selection of the surface(s) in WB where the bf commands are to be applied. Then in a command object just add the bf commands referencing a nodal component of the same name as the named selection. Here's the procedure I used in a simple case that I tried:
1. Created a named selection of a surface in WB called 'Heat_face'.
2. Added a command object in the Environment with the command BF, Heat_face, TEMP, 100.
3. Wrote the input (or ds.dat) and the BF command was there.
In ANSYS 'Heat_face' will show up as a nodal component. Hopefully that's what he's after. |
QUESTION<br><br>Defining a temperature in a Workbench Simulation model and writing out an ANSYS input file, one finds that the thermal load is applied as a D command and not as a BF... |
I was trying to look at edmrate and kinrate in CFX-Post. How can I view these rates separately so that I can see where the combustion is kinetically controlled? |
Separate post-processing of reaction rates is often useful in debugging combustion problems in which there are temperature over shoots, or in deciding how to tune combustion models. The best way... |
Q. Can FLOTRAN Simulate Vortex shedding?
A. Yes, it can. Please see the attached input file named vortexinput.zip. Also attached is a much larger file (~7 MB) vortex.zip which contains the input files and several animations. The Reynolds number is 1000.
If you have problems obtaining these files, please contact ANSYS Technical Support. |
Q. Can FLOTRAN Simulate Vortex shedding?<br><br>A. Yes, it can. Please see the attached input file named vortexinput.zip. Also attached is a much larger file (~7 MB) vortex.zip... |
QUESTION:
Do you have an example demonstrating the procedure for calculating charged particle trajectory using PLTRAC due to a combined E and B field?
ANSWER:
See the attachment to this solution |
QUESTION:<br><br>Do you have an example demonstrating the procedure for calculating charged particle trajectory using PLTRAC due to a combined E and B... |
CFX-Pre fails during startup with the error message "Mutex Destroy Failure" on Red Hat Linux 8.0 |
This is due to the KDE desktop. Install new patches from Red Hat to resolve this.
|
Call of gethostbyname fails in scripts on Linux. |
Check hostname configuration:<br><br> Test on command line: nslookup machine_name<br><br> Sort out configuration in files /etc/hosts ; /etc/resolv.conf ;... |
What version of ICEM-CFD will run on the EM64T, and will it take advantage of the 64-bit extensions? |
We have not yet done extensive testing on the EM64T. However, the linux AMD64 version "should" work fine.<br>It will take advantange of the 64-bit extensions.
|
Are there any BEAM189 examples detailing the element output information? |
Yes, please see the ANSYS 9.0 example below of a BEAM189 model.<br><br> This input file is also "attached" to this solution... |
All of the CatiaV5 models seem to import into ANSYS using metric units, even though the Catia users have their Catia
environment set to an inch system. Why is this? |
As per our development, CATIA V5 uses mm as their length unit internally and in their files. We use the data from their file directly. ANSYS does have a scaling command, VLSCALE, which should... |
Is it possible to project a curved surface onto a plane in DesignModeler? |
You cannot project a curved surface onto a plane in DM. However, you can create a NAMED SELECTION from curved surface edges first, then extrude the NAMED SELECTION to create a frozen solid, then... |
Why is the ds.dat file produced during the solve different from the file Tools > Write ANSYS Input file produces when temperatures are applied in a structural analysis in Workbench Simulation? |
Workbench always does a sequential thermal-structural analysis when temperatures are applied in a structural analysis. The degree of freedom temperatures are solved first in the thermal analysis.... |
My 10-node tet (SOLID168) model seems to output the wrong CG
(center of gravity) information in the d3hsp file for each part. Why? |
This appears to be an obvious bug in the 5434 build of LS970.<br> LSTC Technical Support was notified on February 3rd, 2005. This<br> should be fixed in an upcoming build of... |
How to solve an implicit equation for non-newtonian fluid viscosity. An algebraic equation can not be applied here, as the solver processes the following steps when evaluating an expression for viscosity:
1. Solver recognises, that viscoity is needed as variable to solve the expression.
2. The solver calls getvar.
3. getvar looks for the viscosity.
4. Recognizes that there is no viscosity to put into the expression.
5. Solver looks into the material properties and finds the expression for the viscosity. Now, Solver proceeds with step 1. and comes into a circle. |
The viscosity of the old iteration has to be provided to the solver. Therefore the viscosity of the last iteration has to be stored in the MMS to mask the circularity which would occur by... |
I have results from two different transients runs that I'd like to use to create a
single mpeg animation file. How do I do this? |
<br><br>There are two possible approaches here.<br><br>One way would be to load the first results file and create key frames for the first and last timesteps stored in the... |
Q. I am doing a FLOTRAN analysis with the incompressible formulation. I am using artificial viscosity to stabilize the flow. Do I have to eventually reduce it to zero to get a valid result?
A. No. It is advisable, however, to reduce it to the order of magnitude of the effective viscosity for a turbulent case and within an order of magnitude of a laminar case. The units of Artificial Viscosity are the units of fluid dynamic viscosity (NOT kinematic viscosity). |
Q. I am doing a FLOTRAN analysis with the incompressible formulation. I am using artificial viscosity to stabilize the flow. Do I have to eventually reduce it to zero to get a valid... |
Do you have an example that shows exactly how NFORCE calculates
its values in a full harmonic response analysis? |
Yes, please see the ANSYS 9.0 input below (which is also attached to<br> this solution record as "nforce.inp"). This input consists of two blocks<br> that are... |
When attempting to start ANSYS interactively via the launcher or directly using ansys90.exe,
what causes the error dialogue box, as described below, to appear?
Invalid I/O redirection, specify -i inputfile -o outputfile. (Message) |
This is only occurring during interactive startup on a Windows machine at ANSYS 9.0 when the Working Directory<br>contains the characters "-b" or "-B". This was... |
How can I use single integer arguments in CFX-5.7.1 user CEL user Fortran subroutines? |
Arguments of user CEL functions are usually used to pass variable fields, but it can often be useful to use single integer arguments in CFX-5.7.1 user CEL user Fortran subroutines. There are many... |
I began a DesignModeler session and attached to an active CAD model. Later I moved the CAD file and wished to update the path to DM. The Project page does not show the CAD file and DM will not allow me to browse to the new location of the CAD file. What can I do? |
The problem is this: if you open a DM session and then, from the File menu ¿Attach to Active CAD Geometry¿ the CAD file does not show up in the project page. If, on the other hand,... |