The meaning of MPC184 keyopt(2) was changed rather significantly between 9.0 and 10.0, with the result that some legacy input from 9.0 no longer runs correctly in 10.0. Can't the software developers keep the existing keyopts and just add to the end of them without changing the order? At least then our historical files would continue to run. Please could an explanation be given as to why the 2D option was dropped and why the actual use of the keyoption was changed? |
We agree that it is very important to support our customers¿ legacy input, and normally we do not consciously implement changes that we know will cause problems with legacy models. In this... |
Class 3 Error
SYMPTOM:
When attempting to use particle vertex variables, for example in CEL expressions or in User Fortran, the solver crashes or produces unphysical results.
PROBLEM:
This is due to a bug in the CFX Solver when the particle vertex mass flows are calculated for particles that are injected at Wall type boundaries. General particle injection regions (e.g. specified through User Fortran), and particles injected at boundaries other than Walls ar |
WORKAROUND:<br>No workaround is currently available.<br><br>FIXED IN:<br>Release 10.0 Service Pack 1.
|
Why is the user receiving the following warning on startup of ANSYS 10.0?
OMP Warning: --kmp_axu_set_library: Setting library type to SERIAL. |
To remove this warning, remove the KMP_LIBRARY=SERIAL System Variable by right clicking on My Computer->Properties->Advanced->Environment variables.<br>After removing... |
Question:
We have used the "Paint" option and placed thermal SHELL131 elements over SOLID70 elements to act as a thin insulator coating with a 1-layer thickness. It is desired to use SURF152 surface effect elements on the exposed outside face of the SHELL131 elements. After ESURF meshing the SURF152 elements on the same nodes as were used for the SHELL131 elements, we find that convective loads on the SURF152 elements are acting on the face of the underlying solid element, not the exposed face of the SHELL131 element. Can you tell me what is going on?
Answer:
The problem here is the identification of the degree of freedom. The degree of freedom for the SURF152 is TEMP; the degree of freedom that the user is attempting to connect to is TTOP.
The SHELL131 element has 32 degrees of freedom, all of them temperature. To differentiate them, they were given names like T1, T2,...,TTOP and TBOT. When you use the PAINT option for the SHELL 131, ANSYS changes the degree of freedom from TBOT to TEMP so that the degree of freedom matches the solid element that the SHELL 131 is painted onto. When the user adds the SURF152s with the TEMP degree of freedom, those elements are effectively attached to the bottom of the SHELL131 where the degree of freedom is TEMP. The element itself doesn't know anything about position in space other than through the nodes.
The workaround for this problem is somewhat involved. It will be necessary to create a second area with new lines and keypoints and to mesh that second area with SURF 152 elements with new node number and element numbers. It will then be necessary to connect the SURF152 nodes to the SHELL131 nodes. Constraint equations may be the only answer here since most other coupling options (elements like LINK33 or CP command) have only the TEMP degree of freedom.The constraint equation would look like
CE,NEXT,0,node1,TEMP,1,node2,TTOP,-1
It will likely be convenient to create the mesh of the SOLID70 areas fi |
Question:<br><br>We have used the "Paint" option and placed thermal SHELL131 elements over SOLID70 elements to act as a thin insulator coating with a 1-layer thickness.... |
QUESTION:
Do you have an example showing how to circuit couple independent voltage source CIRCU124 to PLANE53 using the sinusoidal excitation option in a transient analysis?
ANSWER:
See attached input file, plots, and animation |
QUESTION:<br>Do you have an example showing how to circuit couple independent voltage source CIRCU124 to PLANE53 using the sinusoidal excitation option in a transient... |
**** Entered By: rlange @ 09/26/2005 12:08 PM ****
Q. Where can I find an example of a Thermal Stress calculation using ANSYS Multiphysics and CFX. I want CFX to solve a Conjugate Heat Transfer Analysis and ANSYS to solve for the resulting thermal and pressure stresses in the structure. The assumption is that the deformation of the structure has a negligible effect on the flow field.
A. Such an example, using the ANSYS Multifield Solver, is attached. Since the CHT problem is solved in CFX, the a Multiphysics license is needed in order to transfer the temperatures. |
**** Entered By: rlange @ 09/26/2005 12:08 PM ****<br>Q. Where can I find an example of a Thermal Stress calculation using ANSYS Multiphysics and CFX. I want CFX to solve a Conjugate Heat... |
QUESTION:
Do you have examples demonstrating a method for calculating net flux passing through a coil? My objective is to use time varying flux in a harmonic response or transient analysis to calculate induced EMF in a sense coil of an eddy current probe.
ANSWER:
The attached zip file contains a 30 degree sector of a simple air coil modeled 2 ways:
1) SOLID97 MVP (flux calculated with surface integral of B_normal and also with FLUXV.MAC)
2) SOLID117 edge flux formulation (flux calculated with surface integral of B_normal - FLUXV.MAC is not applicable).
In both models, the coil is current fed (BFE,,JS...) and has a uniform current density over its cross section, just as a stranded coil would. In a sensor application, the sense coil current will be negligible so no current excitation should be defined in it. Coil current excitation should instead be defined in the drive coil. |
QUESTION:<br><br>Do you have examples demonstrating a method for calculating net flux passing through a coil? My objective is to use time varying flux in a harmonic response or... |
Why does ls970.exe crash when running from the Launcher?
ls970.exe
ls970.exe has encountered a problem and needs to close.
We are sorry for the inconvenience. |
There is a defect for this issue and we are planning to have it fixed for ANSYS 10.0 Service Pack 1.<br><br>The problem is caused by certain messages being displayed in the LS-DYNA... |
User has installed Ansys Workbench 10.0 and the plugin for AutoDesk Mechanical Desktop 2006 (MDT2006), but the menu is not displayed in MDT. |
The mechanism by which MDT handles third-party menus has changed in MDT2006. Use the following procedure to manually add the menu.<br><br><br>Use the following procedure to add... |
When I load a large simulation, or try to visualize 3D bodies in a large simulation, CFX-Post prints an error message stating that it failed with an unrecognized exception. What is the cause of this error message? |
This error message is often the result of CFX-Post running out of memory. You can attempt to close down other applications which may be consuming memory on your machine to help this. This message... |
How to avoid failure of PVM at start of parallel run with error code 1? |
When the hosts.ccl file does contain a machine whose name can not be resolved in the network, then PVM can not start correctly. The following error message is printed:<br>... |
Is DesignExplorer or DesignExplorer VT supported on the Unix or Linux platforms with Workbench? |
No, DX or DXVT are not supported on the Unix/Linux ports of Workbench.<br> There are no plans to support this in the future.
|
Q. I am getting some strange differences between slice and sample plane behaviour, particularly on points 'outside' the domain, in Post in CFX-10.
A. There is now an Interpolation Tolerance in Post that means sample points considered just outside the flow domain are snapped to the domain boundary (and therefore assume the boundary value). The tolerance defaults to 5% of the domain extent. If your domain is large compared to the geometry of interest that intersects your slice plane, the sample points might be snapped to a boundary (eg. parallel to the plane) when they shouldnt be. Hence they are displayed with non-zero values instead of being 'undefined'.
You can change the tolerance (or turn it off and revert to 5.7 behaviour by setting it to 0) in Edit > Options > Post. |
Q. I am getting some strange differences between slice and sample plane behaviour, particularly on points 'outside' the domain, in Post in CFX-10.<br><br>A. There is now... |
I specified a Z-rotation constraint using remote displacement in WB 9.0. In WB, the remote displacement details show reaction values for all 6 DOFs. If I look at the results in Traditional ANSYS, the only reaction at the pilot node is MZ, as expected. Why does WB report these extra reactions for the other DOFs? |
This is a known error for WB 9.0 that has been fixed in 10.0. The problem was that at 9.0, the program was getting the reaction using FSUM logic on the attachment geometry of the remote... |
With the release of 10.0 and the new cohesive zone elements, an interest in modeling the adhesive properties has arisen. We have contacted our adhesives material supplier to perform testing but they have indicated that they are not sure how to gain the necessary parameters, (normal/shear separation and max normal stress). Can you provide any published works on how these parameters can be obtained from empirical techniques? Also, please clarify the meaning of the material constants for the CZM material model. |
Here is further explanation of the three material parameters:<br><br>C1 (sigma_max) is simply the peak value of tension stress, and C2 (delta_n_bar) is the corresponding deflection at... |
Q. If I have multiple versions of CFX installed on my machine, how can I control which versions show up in the CFX launcher?
A. If there are several versions of CFX on the system, they will each have their own installation directory. What shows up in the launcher will be a function of what in the "launcher directory". A typical location of this directory is as follows:
Program Files> Ansys Inc > CFX > CFX-5.7.1 > etc > Launcher
Each installation of CFX will have this directory, and the launcher will show all the versions that have this directory.
If you rename the directory Launcher to, say, Launcher1, it will not be seen by the launcher next time it comes up. |
Q. If I have multiple versions of CFX installed on my machine, how can I control which versions show up in the CFX launcher?<br><br>A. If there are several versions of CFX on the... |
When I am setting up a transient run inside of CFX-Pre, it is fairly easy to specify a timestep list using the asterisk for repeated steps,
i.e. 5*.01 [s}, 10*.02 [s}... If I am working outside of CFX-Pre, what is the easiest way to modify the timestep list with a number of repeated steps without typing in the whole thing manually? |
<br><br>One way to do this uses a CCL file snippet with Power Syntax (embedded Perl commands) that does the looping necessary to set up and modify the timestep... |
ANSYS 10.0 32-bit will not work with Pro Engineer on a Windows x64 machine. |
We do not support the x64 version of Pro/e Wildfire, mainly because a 32-bit DLL<br>(our PROE CAD Interface DLL) will not load into an x64 executable's process space.
|
Since I have upgraded from WB version 9 to 10, I can no longer generate meshes in CFX-Mesh. The program launches normally and everything works normally until I try to create the mesh. Then I get the following error and WB hangs:
GTMMES~1.EXE has hit at problem and will shut down. |
the problem could be due to non-English characters in the pathname:<br><br>C:Documents and SettingsusernameLocal SettingsTemp<br><br>To check this, go to the Workbench ... |
I am having problems opening a geometry file in Workbench DesignModeler 10.0
The Pop up message said:
Line: 15148
Char: 2
Error: Object required
Code: 800a01a8
Source: microsoft JScript runtime error
Script: var pg = pm.PreferencesCategories.Item{"CATNAME_DesignModeler"}.PreferencesGroups; |
It cannot find the preference manager or cannot access DesignModeler¿s preferences xml file.<br>A suggestion is to look in your Application Data folder to see if your... |
I would like to calculate the interphase drag coefficient Cd in CFX-Post 10.0.
I notice that in the VARIABLES file there is setting Output to Postprocessor = No with Cd.
Is it possible just change this to Yes? If it is, can I use a local version of VARIABLES file instead of that in the cfx root directory? |
You can change it locally by adding it to your CCL.<br>CFX-Pre 10.0 will have a problem reading it if the CCL is in the .def file, so I suggest the folowing:<br>1. Create a ccl file... |
Error Message after installing ICEM CFD 10.0 on a SuSE Linux 9.0:
Command test_licensing not found
...
HAS_AIENV undefined |
Environment Variable ICEM_ACN was set to the wrong directory. Make it point to <install_dir>/ansys_inc/v100/linux.
|
Question:
I cannot find information on the binary file that contains the view factors for a radiation calculation, file.vf. Is there any information available that would allow me to access the binary form of that file since the ASCII form does not have sufficient accuracy for the calculations that I am doing.
Answer:
The information contained on the file.vf in binary form is the same as the information in ASCII form. The only difference is in the format of the file. The ASCII form of the file may be read with any stardard text editor. The binary form of the file appears to be a standard ANSYS binary file that may be processed like any other ANSYS binary file. A user can access the binary information in two ways: dumping the file in ANSYS using the /AUX2 routine or writing an external program to read the file using the reader/writer routines documented in the Guide to Interfacing with ANSYS.
The binary file has an ANSYS Standard Hearder record that contains the standard information. This record is documented in the Guide, Section 1.1.2. Beginning at record 2, the view factors are written per enclosure per element. Or, in Fortran terms
DO II 1,Enclosure Number
DO JJ 1,Number of Elements
Write (N) (viewfactor(kk),kk=1,Number of Elements)
ENDDO
ENDDO
Each record contains the view factors from the current element face to the other faces in the enclosure. Records are written sequentially. Users should be able to use the BINSET function to open the file and BINRD8 subroutine to read the various records. The Guide includes several examples for reading ANSYS binary files.
Questions concerning this should be directed to ANSYS Technical Support. |
Question:<br><br>I cannot find information on the binary file that contains the view factors for a radiation calculation, file.vf. Is there any information available that would allow... |
User has installed OneSpace Designer Modeling 2005 (a/k/a OSDM version 13.20) and Ansys Workbench 10.0
The user gets a plugin error when attempting to import an OSDM geometry file.
- The OneSpace plugin was selected during Workbench setup.
- In OSDM, Applications > Modules > Add-Ins Tab
Attempting to check ANSYS 10.0 causes the following:
Error : Activation of module ANSYS 10.0 failed. (.NET initialization failed) |
The Microsoft .NET Framework 1.1 is not properly installed on the system, and/or OSDM is not registered.<br><br> - Re-Install Microsoft .NET Framework 1.1 from the OSDM Installation... |
Q: Post crashes hard while processing a very big session file and the license stays blocked. How can I have it released?
A1: First of all, this should not happen. Check system configuration and update FlexLM version and CFX Version. The server will release the license after 1 hour. Restart License Manager or reread license file to force immediate release.
A2: Licensed feature can be killed by LM admin. He should log in to the Server and post the following command:
lmutil lmremove [feature] [user] [lic_server] [client]
License Status can be gathered by lmstat |
Q: Post crashes hard while processing a very big session file and the license stays blocked. How can I have it released?<br><br>A1: First of all, this should not happen. Check system... |