. How do I apply a harmonic displacement on a surface in a transient structural analysis?
Can I use a function or do I have to use a table? Is there an example I can refer to?
I have a given amplitude and frequency. |
You can define it as a function in ANSYS.<br><br>GUI pick: Parameter > Functions > Define/Edit<br>Function Editor dialog pick (all buttons): SIN 2 ... |
######## WORK NOTES COPIED FROM INCIDENT 461653 ########
**** Entered By: jpataski @ 12/15/2005 02:44 PM ****
Caller - Sudhaker
message "no license is available"
**** Entered By: mding @ 12/15/2005 02:56 PM ****
asked the user to check with the system administrator to see if the interface license is available.
**** Entered By: mjmiddle @ 12/16/2005 02:14 PM ****
There is a problem with the license checking in the ug20_vendor_dir in ICEM
5.1.
Assuming you are running on Windows, unzip the attached zip file and replace
with the file at:
C:Program FilesAnsys Incv90icemcfd5.1-windifuglibug
Best Regards,
Matthew Middleton |
######## WORK NOTES COPIED FROM INCIDENT 461653 ########<br>**** Entered By: jpataski @ 12/15/2005 02:44 PM ****<br>Caller - Sudhaker<br><br><br>message "no... |
Is it possible to append new plots to an existing graph file? |
In ANSYS Release 10.0, you can only append to the last file specified by a /SHOW command within the same. You cannot append to a previous file from the same session or a previous file from a... |
Is it possible to plot contour information along the length of a LINK10 element? |
In ANSYS Release 10.0, you can plot contour information along a LINK10 element using PLLS. To plot contour information along the length of LINE element (LINK or BEAM), first store that... |
Is it possible to import multiple CDB files with shells defined by both SECTION IDs and REAL constant numbers? |
In ANSYS Release 10.0, you must take great care if importing CDB files where some elements are defined using SECTION IDs and some elements are defined using REAL constants. If both SECTION IDs... |
How can I obtain the time derivative of a variable? |
This can be achieved with a user CEL routine as described below.<br><br><br>INTRODUCTION<br><br>In some transient simulations, it can be useful to have access to... |
I have a geometry that I am trying to mesh in CFX-Mesh. The largest dimension in my model is on the order of 5000 in model units, but
I have small faces with edge lengths on the order of 1 which I would like to resolve. I can create a surface mesh which appears to resolve the small faces well, but when I try to create a volume mesh, I get an error message which says that the surface mesh is intersecting.
What can be done? |
<br><br>You can run into some issues in CFX-Mesh when the size of the model reaches several thousands in model units and there are small features that you wish to resolve. One... |
Q. Some dsdb models, which originated in 10.0, will crash Simulation when the user tries to reopen them. They open fine in 11.0 beta.
What is the possible cause?
A. One possible cause of a crash is a DSDB file which has been saved while a CAD parameter is selected ("P") in the details window in a model with multi-body parts. This is a defect in the code that has been corrected for 10.0 Service Pack 1. The workaround is to save the dsdb model without cad parameters selected. |
Q. Some dsdb models, which originated in 10.0, will crash Simulation when the user tries to reopen them. They open fine in 11.0 beta.<br>What is the possible cause?<br><br>A. ... |
I have heard that it is possible to set up and run a MHD problem in ANSYS CFX 10.0 to include Ohmic heating (in a conducting solid, for example) but I don't know how to do it. What steps should I follow? |
<br><br>Setting up and solving certain electromagnetic problems can be done as a beta feature in ANSYS CFX 10.0. There are customization files and scripts which will allow you to set... |
I set up a monitoring point for some variables in the CFX 10.0 solver. When I export in Post the same variables at the same location I end up with different values for my variables than those given in the solver manager. Why is that? |
When setting up a monitoring point, the solver looks for the vertex closest to the monitoring point that you have defined, and monitors the values there. Depending on the mesh resolution, the... |
Can I create a plane in Post with fixed dimensions at an offset w.r.t. the origin? For instance, when I specify a YZ-plane with dimensions Y=1m, Z=1m, the plane is plotted centered about the XYZ origin. I would like to set the plane centered about Z=1m. |
This is done by creating a plane with the method 'Point and Normal', rather than selecting a YZ plane. The point will be the centre of your plane, and the normal will give its... |
How can I obtain a solution variable at a previous time step for use in a CEL expression? |
This can be achieved with a user CEL routine as described below.<br><br><br>INTRODUCTION<br><br>At time of writing, (current release is CFX-10.0) CEL expressions only... |
I am running a multiphase simulation with the particle model. I expect the area density to be related to the volume fraction and particle diameter by
A_int = 6 * volfrac / d
When I plot the area density in Post, I find that this is the case almost everywhere but for a few locations. Why is that? |
The particle model is strictly only valid for continuous-disperse flows. The area density is clipped when the volume fraction of the disperse phase exceeds a maximum value, which by default is set... |
I would like to reduce the heating values of gases in a combustion simulation to represent a low combustion efficiency. How can I modify the NASA coefficients? |
The ccl below uses the CEL expression CombEff to adjust the heating values:<br><br>LIBRARY:<br> MATERIAL: Methane Air WD1<br> Option = Variable Composition... |
CFX-Mesh gives the following error on Linux running Redhat Enterprise Workstation 4:
Storage allocation failed
Number of words requested = 18000
No. bytes/word = 8
Array = tr_src
Current memory allocated = 954212 bytes
Maximum memory allocated = 954212 bytes
============================================================================
The mesh generation program was unable to allocate enough memory.
That is memory that can be grabbed by a 'malloc' statement. In general
this will be a machine dependent combination of available real memory
and swap space. If in doubt, contact your systems administrator.
You will either need to:-
(1) Increase the size of the available hardware:
(a) Run on a machine that has more memory/swap space. OR
(b) You may be able to run the problem on this machine when there
are fewer processes running on it.
(2) Reduce the size of the problem.
============================================================================ |
Workbench 10.0 will not run on Redhat Enterprise Workstation 4. From experience we know it is OK on Redhat 8 and 9 and Redhat Enterprise 3, as well as the officially-supported Redhat 7.3. In fact... |
SYMPTOM:
When trying to run the CFX-Solver in parallel on Windows using the MPICH version, the run fails with the following error:
Error 32, process 0, host VORTEX:
CreateFile failed: .mpi3.tmp
Wait for process 0 to write port to temporary file timed out
An error has occurred in cfx5solve:
The CFX-5 solver has terminated without writing a results file.
Running the PVM version of the solver, or running in serial mode, work as normal.
PROBLEM:
This problem is known to occur on some Windows machines running the Symantec Antivirus software. It appears that the creation of the mpi temporary file is delayed by the intervention of the antivirus process, and this causes the solver run to fail with what is essentially a timeout error. |
WORKAROUND:<br>No workaround is currently available.<br><br>FIXED IN:<br>A modified MPICH library for Release 10.0 is available.
|
Customer gets the following error when installing ANSYS 10.0 on Windows XP 64-bit system:
This installation of Ansys 10.0 requires an Itanium System.
Why is he unable to run the setup? |
The customer was trying to install ANSYS 10.0 on an EM64T (x64) machine.<br>Applications written for the Itanium processor will not run on an EM64T system.<br>Currently ANSYS only... |
Trying to run the ANSYS Product Launcher, the user receives:
"Can't read env(Ansys_appdata_dir) no such variable"
What is the cause of this error? |
Usually it is a permissions problem where the user is locked out of the registry.<br>When logged in as the user, check to see if the following registry key... |
How to apply the Intel Visual Fortran 9 compiler for ANSYS CFX 10 applications? |
<br><br>ANSYS CFX 11 will be switching from Digital Fortran to Intel Visual Fortran 9 for the officially supported compiler<br>to build user fortran for the CFX solver on Windows... |
I would like to set-up a problem for a fluid with a non-Newtonian viscosity dependence.
Are there any built in models for doing this in CFX? |
There are various non-Newtonian viscosity models available in CFX as beta features.<br>The available models are the Herschel-Bulkley, Bird-Carreau, Cross, and Power-Law<br>models. The... |
How can two tangent interfaces gliding along each other be defined in CFX-10.0 Pre? |
<br>Edit CCL and add in the respective boundary section for the interface side the following syntax:<br><br> BOUNDARY: int1 Side 1<br> Boundary Type =... |
QUESTION:
I have heard that the 3D magnetic vector potential (MVP) formulation used by SOLID97 fails to accurately predict the magnetic field at material interfaces across which there are large changes in magnetic permeability. This was the motivation for creating the edge flux potential formulation (SOLID117), which correctly predicts fields in such cases. However, a number of features available for SOLID97 (circuit coupling through CIRCU124, sliding interfaces via CEINTF, and companion infinite boundary elements) are not yet available for SOLID117. If I have an application requiring these features in a system with material interfaces, is there a workaround to correct the field error at material interfaces using SOLID97 so that I may use these features?
ANSWER:
An unsupported procedure has been known to work in at least some cases. A simple example (attached to this solution) in which a permanent magnet is placed along side a permeable bar is solved 4 different ways:
1) mdl02.inp: 3D MVP (SOLID97): field distribution and magnitude differs considerably from all other cases
2) mdl03.inp: SOLID117
3) mdl04.inp: SOLID98 magnetic scalar potential (MSP)
4) mdl02c.inp: SOLID97 using the workaround described below - field distribution and magnitude agrees well with cases 2 and 3. Input file calls macros mbdryMVP.mac and mbdryCP.mac.
The steps in the workaround may be summarized as follows:
a) rotate nodal degrees of freedom on the material interface so that the nodal x direction is normal to the interface
b) duplicate the iron mesh, discard the original mesh, retain the duplicate copy (no longer joined to the surrounding "air", but has duplicate nodes along the interface).
c) couple only tangential components (AY and AZ) of MVP on coincident pairs of nodes at the iron-air interface.
The attached presentation and input files illustrate that SOLID117 edge and SOLID98 MSP results agree and that SOLID97 results are incorrect unless the procedure summa |
QUESTION:<br><br>I have heard that the 3D magnetic vector potential (MVP) formulation used by SOLID97 fails to accurately predict the magnetic field at material interfaces across which... |
Question:
The MPINQR command seems to work with MPINQR(0,0,12) and MPINQR(n,0,1) but MPINQR(n,61,1) does not catch the non-linear material. The *get command doesn't appear to do something similar. Is there an alternative command that can do the same?
Answer:
There was a change in the way material properties are stored in the database at release 8.0. This was necessitated when the number of linear material properties became greater than 60. The nonlinear material properties now begin at 80 (release 10.0) but the MPINQR command will not identity the existance of nonlinear properties. The MPINQR command continues to function when the MAT value is 0 for the existance of nonlinear properties but will not identify anything associated with the nonlinear properties.
MPINQR was exposed to the command level for the purpose of creating the GUI and its use is not considered a part of standard ANSYS. That it no longer functions as previously is NOT an error and likely will not be corrected. The corresponding nonlinear inquire function, NLINQR, is not used by the GUI and is not exposed to the command level of the program. For the TB data that may exist in the database, the GUI uses the undocumented ITEM1 value of EXIST; a returned parameter value of 1 indicates that this particular nonlinear properties exists for this material. For example, if TB,BKIN had been defined for the problem, the *GET,CON,BKIN,1,EXIST would return a value of 1. Since the ITEM1 label of EXIST is also not documented, its use could change in the future but that is highly unlikely since ITEM1=EXIST is used by the MATERIAL GUI to obtain information about the nonlinear materials. Note that the ITEM1=EXIST only works for a single material. If the user is attempting to identify the highest material number used, he should continue to use the MPINQR for that purpose. |
Question:<br><br>The MPINQR command seems to work with MPINQR(0,0,12) and MPINQR(n,0,1) but MPINQR(n,61,1) does not catch the non-linear material. The *get command doesn't... |
I'm trying to get results from a shell model (using SHELL91 and SHELL93 elements).
It appears that nodal results are available on the 'TOP' and 'BOTTOM' surfaces
for both these element types. How can I retrieve that data and then print it out? |
I modified ANSYS Verification Manual sample vm35 to use the *VGET and *VWRITE<br>commands along with the SHELL command in POST1 to store and output the top and<br>bottom values. I did... |
Is there a way to release all moments at the end of beam 188? |
You could utilize a macro to create the new node and couples. A possible<br>macro could look like this.<br><br>! macro file named bmomrel<br>!<br>! macro to remove... |