Verification Manual Input Data 121 (VM121) contains a fully developed laminar flow problem with constant heat flux. On the basis of theory in that problem, Nusselt number will be 4.36 and corresponding heat transfer co-efficient will be 7344.4 w/m2-k. This theoretical result is discussed in the "Temperature Solution" section of VM121.
But heat transfer coefficient determined by ANSYS (PLNSOL,HFLM) ranges from ~100 - ~600 and averages about 250 W/m^2C, which of course is far lower.
Why is this so? Is the FLOTRAN-calulated result incorrect? |
From the equations in VM121 write-up:<br><br>H = Nu*k/D = (4.36)(8.54 W/mC)/(0.005m) = 7450 W/m^2C<br><br>The FLOTRAN-calculated film coefficient ranged from ~100 - ~600... |
What advection and transient scheme should I use for a DES simulation? |
You should typically choose a 'High Resolution' or 'Specified Blend Factor' scheme for the advection, and the 'Second Order Backward Euler' scheme for the... |
The solver manager fails with the following error messages:
Error sending CCL to database.
CCLAPI::loadCCLDat |
<br>CCL parser failed with message:<br>Perl Syntax errors detected:<br>Error creating /MONITOR WORKSPACE:<br>cclCreateObject: unable to<br>create at C:Program... |
I ran a multiple sequence analysis and have results available. I would like to save figures for my Report which show results from each load step. However when I insert a figure in a result then change the sequence number in the graphics window the result and the figure update. What can I do to get figures from each sequence? |
For each sequence that you wish to capture in a figure, insert a result object. For example, if you have a 3 sequence model and want the stresses from each load step you would insert the stress... |
By default, the outer edge of the model is highlighted on a Q-slice plot. Is it possible to turn off the outline. |
Yes. In ANSYS Release 9.0, you can turn of the edge outline using /GLINE,,-1. See example... |
Q. I get the following error at the end of CFX 5 installtion on a Intanium 2 machine running RedHat Linux Work Station 3.0.
System Information:
------------------------
RedHat Linux Work Station 3.0
Host Name: cae00
Kernel: 2.4.21-4.EL #1 SMP
Fri Oct 3 17:29:39 EDT 2003
ia64 ia64 ia64 GNU/Linux
File: glibc-2.3.2-95.30.ia64.rpm
File: glibc-2.3.2-95.30.i686.rpm
ERROR MESSAGE RECEIVED:
-------------------------------
.......
.......
Loading (33Mb): QT 3.2.3-1 Runtime Files...
Loading (1Mb): QWT 0.4.1-3 Runtime Files...
Loading (8Mb): CFX-5 Mesh Adaption Binaries...
Loading (9Mb): CFX-5 basic runtime libraries...
Loading (143Mb): CFX-5 Solver...
Loading (37Mb): CFX-5 Solver Manager...
Loading (2Mb): Basic Shared Files...
Loading (44Mb): CFX Command LangLibrary Files...
Loading (2Mb): User Interface Shared Files...
Loading (163Mb): CFX-5 example files...
Loading (52Mb): CFX-5 Online Docntation...
CFX-5.7 (C) 1996-2004 CFX Ltd. All rights reserved.
Setting up a default parallel host configuration
Error setting up database for API: Error loading library /usr/local/cfx/CFX-5.7/lib/linux-ia64/CCL_Parser_Lite.so
: libcxa.so.4: cannot open shared object file
: No such file or directory at /usr/local/cfx/CFX-5.7/lib/ccl/CCL/Parser/Lite.pm line 84.
Compilation failed in require at /usr/local/cfx/CFX-5.7/lib/ccl/CCL/API.pm line 109.
RESOLUTION:
This is a known error in CFX 5.7 and CFX 5.7.1, but it's harmless . It just means that it's failed to create the default hosts.ccl file. You should be able to use all modules of CFX without any problems.
The hosts.ccl file is used to setup distributed parallel runs. Since it failed to create a default hosts.ccl file, please refer to CFX Help pages for more info on how to create one manually. Help>Master Contents> Solver Manager>Contents>Using Solver Manager> Setting Up and Running a Parallel Run. |
Q. I get the following error at the end of CFX 5 installtion on a Intanium 2 machine running RedHat Linux Work Station 3.0.<br><br>System... |
How to write the torque relative to a User Defined Axis to a file from CFX-Post? |
Example CFX-Post Session File:<br><br>COORD FRAME:Coord Frame 1<br> Axis 3 Point = 0 [m], 0 [m], 1 [m]<br> Coord Frame Type = Cartesian<br> Origin Point = 1 [m], 3... |
How does Workbench handle multiple loadcase in the calculations in the Fatigue Tool. In particular, when I insert a solution combination into the problem, how is each load case handled fatigue-wise? I.e., how is the load set for each used, particularly when the loading type(reversed, zero-based etc.) is different in each load environment. What if one load is present all the time, like gravity? |
At the present time (Release 9.0), the fatigue tool calculations in each Environment are independent and are based upon the specifications of that environment. Under the details of the Fatigue... |
How to get the number of nodes in a CFX-Post macro? |
Example session file:<br><br>MESH CALCULATOR:MESH CALCULATOR<br>Mesh Function = Mesh Statistics<br>END<br>> mesh<br>!$nodes = getValue("MESH... |
QUESTION:
Do you have a 3D example of a charged particle trajectory due to bot E and B fields acting simultaneously.
ANSWER:
See attached file |
QUESTION:<br><br>Do you have a 3D example of a charged particle trajectory due to bot E and B fields acting simultaneously.<br><br><br>ANSWER:<br><br>See attached... |
How to switch off convection in a transport equation for an additional variable (pure diffusive transport, No Convection Keyword of CFX-4)? |
This can be done with the following steps:<br><br>1. Define a standard transport equation in CFX-Pre and write definition file.<br>2. Change the type of transport equation to... |
Why does Autodesk Inventor generate an application error and then close (crash) when the Workbench plugin is enabled to Load on Startup in the Inventor Add-in Manager? |
Possible causes are :<br><br> 1. Ansys Workbench plugin (Add-in) is conflicting with an Add-in that is already loaded.<br><br> To test this, in Inventor, go... |
I wrote a macro to round a number to the nearest integer. Is there any automatic method to round to the nearest integer in ANSYS? |
Yes, use NINT(x) where x is the number you want to round to the nearest integer. For example, if your number is... |
Are there any examples of getting transmissibility factors in ANSYS Workbench? |
Yes, please see the attached files for an ANSYS Workbench Simulation 9.0<br> example. A cantilever beam has its base displaced in a full harmonic<br> response analysis. ... |
How to reduce or disable the popup-window with the warning on the license expiry? The message is: "The license for one or more ANSYS products will expire in 20 day(s)! Please contact your ANSYS Sales Representative or ANSYS Inc." |
A popup window on the upcoming license expiry is shown at every start of ANSYS Workbench in case less than 30 days remain until the expiry of the license. This period can be modified by setting... |
A parallel run with MPI and User FORTRAN in the setup fails on Windows. Why? |
With User FORTRAN always the pvm solver library is linked with the executable, indepent which type of parallel communication (PVM or MPI) will be selected. This is hardcoded in the file... |
Will there be a 64-bit version of Workbench at 10.0? |
We are looking to support running a 32-bit Linux version of Workbench on a 64-bit Linux Opteron for WB 10.0.<br>We are also looking to support a 64-bit version of WB on Sun for the next... |
What are the differences between EM64T and Opteron versions on ANSYS 9.0? |
AMD64 and EM64T mean same technology for different<br>chip sets/manufacturers. AMD64 is AMD Opteron (true 64bit<br>system) and EM64T is Intel Xeon (32bit system) with... |
User saves his wbdb and dsdb files, exits Workbench, then tries to re-enter Workbench.
He then gets the following error:
Internet Explorer Script error
Script error
An error has occurred in the script on this page
line 292
character 3
error object expected
code: 0
url: File://C:Program FilesANSYS Incv81aisolstartpagesstartpageslanguageen-ushtmlstartscreen.htm
Do you want to continue running scripts on this page?
Yes No
How does the user resolve this? |
The script file to resolve this issue in Workbench 8.1 is attached.<br>Here are the instructions:<br><br>1. This fix applies to 8.1 only.<br>2. Locate the C:Program... |
I have several questions related to swelling.
1. According to the documentation, swelling is only available as a User Programmable Feature (UPF), USERSW. Is that true?
2. Is USERSW limited to isotropic materials?
3. Is USERSW available for SOLID226/227. If not, can it be made so? |
The concept of swelling in ANSYS means different things to different people. Historically, irradiation induced swelling was all that was available. In recent years, questions have come in... |
How can I create an extruded, 2-D or 2D mesh in CFX-Mesh? |
The CFX-5 solver does not currently support true 2-D meshes (e.g. tri and quad meshes), but similar result can be obtained by using an extruded mesh having a thickness of one... |
I'm running a transient simulation in a closed system (no inlets or outlets).
I've noticed that if my fluid is modeled as an ideal gas, the initial condition that I use for pressure is applied. I verify this by checking the pressure in the backup file at 0 iterations.
If the fluid is incompressible, however, I notice that the initial condition I set for pressure is not applied. If I set a constant initial condition, that condition is replaced by a zero field for initial pressure. If I set a variable initial condition for pressure, my initial guess is shifted by some amount.
What's going on? |
<br><br>Here's a summary of the behavior you should expect:<br><br>1. If the density depends on pressure (say for an ideal gas) and you set an initial condition for... |
Q. I am using inches as my working unit in Inventor 9. When I open the model in CFX-Mesh, it appears that the model was changed into Centimeters. I thought that CFX-Mesh did not do any units conversions. What happened?
A. CFX Mesh did not convert the units. The user can choose the working units in Inventor 9, but that does not control how Inventor stores the model. It will always do that in Centimeters. So that's what CFX-Mesh reads. |
Q. I am using inches as my working unit in Inventor 9. When I open the model in CFX-Mesh, it appears that the model was changed into Centimeters. I thought that CFX-Mesh did not do any units... |
Q. Are there any examples of how to move contact nodes to target surface by running a partial solve with CNCHECK,adjust in Solution?
A. Attached is a sample APDL input illustrating how this works. |
Q. Are there any examples of how to move contact nodes to target surface by running a partial solve with CNCHECK,adjust in Solution?<br><br>A. Attached is a sample APDL input... |
My new Bladegen Plus license doesn't work - Bladegen works, but Bladegen Plus is still in Demo mode. |
This usually occurs when moving from a local license to a network license. To correct, set an enviroment variable LM_LICENSE_FILE to port@host. Usually this is... |