**** Entered By: akpaul @ 06/20/2005 10:20 AM ****
Q. How do I set the units of Pressure to "inches of Water" in CFX POST?
A. It turns out that "inches of Water" is a built in unit system in POST - unfortunately, it does not show up in the drop down menus in POST. Here are the instructions on how set the pressure units in POST to "inches of Water".
1 - Open POST and go to Edit>Options
2 - In the Pop-Up menu, select the "Units" option in the tree structure.
3 - Set the unit system to "Custom"
4 - You should see the Pressure units set in the "Quantity Types" list. (Usually pressure will be set to Pa)
5 - Click "in" the white space next to "Pressure". Do NOT use the drop down list.
6 - Clear the existing unit system (use back space)
7 - Type in "in Wg". NOTE the space and the case. It should match as given. See attached picture.
8 - Click 'OK' on the options form.
All legends should automatically update to show the current unit system. |
**** Entered By: akpaul @ 06/20/2005 10:20 AM ****<br>Q. How do I set the units of Pressure to "inches of Water" in CFX POST?<br><br>A. It turns out that... |
######## WORK NOTES COPIED FROM INCIDENT 411105 ########
QUESTION:
Is it possible to have more than 32 characters in a parameter? Any workarounds? The customer wanted to put the directory path in the parameter, for example.
PDIR='P:AutomotivedynamicsPROJP059413486_LV_3567_BerakningsresursGrenror_andbitANSYS_Inputgrenror_end_v11_gror_base'
/INPUT,'grenror_v5a','cdb',PDIR
ANSWER:
I recommend the use of a string array as follows (I picked 128 as just a relatively large number):
*DIM,PDIR,string,128,2
PDIR(1)='P:AutomotivedynamicsPROJP059413486_LV_3567_BerakningsresursGrenror_andbitANSYS_Inputgrenror_end_v11_gror_base'
PDIR(2)=join(PDIR(1),'grenror_v5a')
/INPUT,PDIR(2),'cdb'
Note that the dir field is no longer documented and users should put the path and filename into the Fname field. |
######## WORK NOTES COPIED FROM INCIDENT 411105 ########<br><br><br>QUESTION:<br><br>Is it possible to have more than 32 characters in a parameter? Any workarounds?... |
How can I change the allocated memory in CFX and why might I need to do this? |
There are various memory settings available, which can be specified from both the solver manager and when running the solver from the command line. The notes below explain the issues and what to... |
How can you orient the outward normal of surfaces and shells in WB? |
There is currently (v. 10) no straightforward way to do this in WB. Depending on the model¿s characteristics, it might be possible to use named selections and ENORM or ENSYM in a command... |
When running the solver it crashed with the following error:
ERROR #001100279 has occurred in subroutine ErrAction.
Message:
Stopped in routine ASS_GLOB_MPFCHT |
The set up has 3 domains, a one fluid domain, a solid domain and a 2 fluid domain. Energy transfer is coupled across them by CHT.<br>In the 2 fluid domain there are 2 energy equations, in... |
A prestressed modal analysis was run on the same model, using WB 8.1 and WB 9.0. The results differed significantly:
ANSYS 8.1 ANSYS 9.0
f1 18.232 Hz 30.839
f2 19.331 31.080
f3 30.747 32.584
Why is there such a difference? |
A program change was introduced in 9.0, due to the resolution of Defect 22811. In ANSYS 8.1, SOLID182, 183, 185, 186, and 187 included pressure load stiffness in modal analyses. Starting in... |
Q.
When running a spectrum (DDAM) analysis in ANSYS 9.0 on a Windows 2000 or XP system, ANSYS aborts with an Unhandled exception in ANSYS.exe: 0xC0000005: Access Violation error in /POST1 during the modal combination phase. The error occurs when using two processors (/config,nproc,2). For Linux systems, ANSYS aborts with a Segmentation fault error. Note, the error does not occur when using just one processor.
The model consists of BEAM188, SHELL63, MASS21, BEAM4, and COMBIN14 elements.
A.
The above error is caused by an unintialized number in the SMISC record for the BEAM188 elements. A number such as E-311 is used and ANSYS aborts in the load case combination phase when it tries to multiply it. There are two possible workarounds:
1) replace the BEAM188 elements with BEAM4 elements
2) suppress the writing of the SMISC records for BEAM188, e.g. in the expansion pass before the solve:
outres,erase
outres,all,none
outres,basic,1
Another possible workaround is to run the analysis using just one processor, however, using just a single processor will not quarantee a successful solution.
This error has been fixed in ANSYS 10.0 |
Q.<br><br>When running a spectrum (DDAM) analysis in ANSYS 9.0 on a Windows 2000 or XP system, ANSYS aborts with an Unhandled exception in ANSYS.exe: 0xC0000005: Access Violation error... |
QUESTION:
I have 2 models of a MEMS scale membrane. One has EMT126 elements with VOLT=0 on all nodes (and so should not exert any force on the membrane), the other has no EMT126 elements at all. Nonlinear geometry effects are on, and I apply pressures in a prestress load step then remove the pressures and recalculate the displacements. Final results between the 2 models differ, but they shouldn't because the EMT126 voltages are all zero. What's happeneing?
ANSWER:
The presence of EMT126 in the database forces ANSYS to turn off solution control. In the model without EMT126, solution control is, by default, on. If you turn off solution control in the model without EMT126 elements, the results will match those with the model that has EMT126 elements in it.
The stiffness in the thickness direction of a 1 um thick membrane spanning 560 um is very small. Normal deflections of ~1e-4 um in this direction are therefore probably numerical noise. This probably explains why the use of different nonlinear algorithms (SOLCON,OFF/ON) predict different results. |
QUESTION:<br><br>I have 2 models of a MEMS scale membrane. One has EMT126 elements with VOLT=0 on all nodes (and so should not exert any force on the membrane), the other has no EMT126... |
Is there a problem with the unit definitions when importing an IGES file into DesignModeler? My model, defined in [m] seems to be imported in [mm] even though I choose [m] when starting DesignModeler. |
Yes there is a problem with IGES files when the dimensions are other than [mm]. This issue has already been griped and will be addressed in a future release. Meanwhile the workaround is to perform... |
Customer is running ANSYS 9.0 on windows platform using a file server installation.
The ANSYS executables reside on a w2000 server, while the client machines are running Windows XP.
ANSYS runs on the client machines fine, with the exception of the help system.
When the help system comes up, the left side table of contents appears and he is able to navigate, but when he selects a topic, the right side of the help screen indicates that it's unable to display the page.
Why is the help documentation not accessible from client machines? |
This issue seems to be a Microsoft problem. We¿ve seen this here.<br>It only happens when a user applies a certain Microsoft patch.<br>We are in the process of writing something... |
**** Entered By: rlange @ 06/24/2005 11:41 AM ****
Q. I am getting the following error messages from CFX-Post. It claims I have not defined a specific heat, but I have. What is wrong?
WARNING
Expression '(hgh2og-hgh2ol)*tmwh2o/((hpfg)*tmwh2o2)' depends on a variable
'gasmix.h2og.Specific Heat Capacity at Constant Pressure' which does not exist.
A. There is an inconsistency in the ccl between PRE and POST which is the problem. Nothing is actually wrong. The results are not affected, and anything you can print/plot in CFX-Post will be correct.
A defect, number 36833, has been filed. |
**** Entered By: rlange @ 06/24/2005 11:41 AM ****<br>Q. I am getting the following error messages from CFX-Post. It claims I have not defined a specific heat, but I have. What is... |
I would like to compare different results in CFX-Post, but it seems that you can only load one results file at a time. |
<br>You can create a "frozen variable" in CFX-Post to allow easy comparisons between two sets of results.<br>Start by loading your first results file. Go to the Variables... |
When starting ANSYS by using launcher90 with the DYNA license, or using command lsdyna90 pr=DYNA i=file.k, the following error is returned:
=========================================================================
Product: ANSYS Mechanical/LS-DYNA (feature 'ansysds')
Checkout failed for the above product.
FLEXlm error message:
No such feature exists (-5,412)
Servers/license files searched:
1055@server
=========================================================================
Why is it trying to checkout an ansysds license? |
This is a defect that was filed and fixed in ANSYS 10.0<br><br>For earlier versions, the workaround is to set ANSYS80_PRODUCT, ANSYS90_PRODUCT, etc.
|
Do you have a model which can be used to verify the theoretical skin depth? (or one that demonstrates that ANSYS calculates the skin depth correctly)? At one skin depth below the surface of a conductor, the volumetric joule heating (W/m^3) should be (1/e^2) times the value on the surface of the conductor (e = natural log base). |
For the purposes of this investigation, I adapted an input file from our documentation (Coupled Field Guide, Section 4.6: Sample Induction Heating Analysis of a Circular Billet). I simplified the... |
With ICEM CFD 5.1, the customer was unable to create a body point using Geometry > Create Body > Material Point > Centroid of 2 points. Despite selecting 2 locations and clicking the middle button to confirm, a body point was not created. |
Save the project end exit ICEM CFD. Locate the cache files written by ICEM CFD and remove them. To locate and delete the cache files:<br><br>On Windows:<br><br>1. Open a... |
When a user tries to run Workbench from a PC with exceed, the program freezes with a blank white screen. Are there any known problems trying to run Workbench using exceed? If so, what is the workaround? |
There is a patch for exceed that fixes this problem. The customer will need to install exceed v9.0.0.28 in order to run Workbench.<br><br><a target=_blank... |
Both Workbench and Pro/E Wildfire 2.0 (64-bit Unix), are installed locally on the same computer, and both Workbench 8.0 & 9.0 along with Pro/E launch and run correctly by themselves.
When the user tries to import a Pro/E part by pressing "New Simulation" in Workbench, then the text window gives the following error:
ERROR: NMS client: internal error occured.
Failed to initialize communications. Some features are disabled.
After that they get 2 pop-up windows:
Plugin Error: Unable to start Pro/Engineer for data transfer
And
Plugin Error: Attached failed.
What is causing Pro/e Wildfire 2.0 and WB 9.0 to not work together properly on HP 11i v1.0 or 11.11? |
There is a knowledge base article from PTC. It says to set the environment variable LANG to "C" for the... |
Question:
Class 3 Error Report no. 2005-08 states that the temperature is evaluated "elsewhere within the element". Does this mean that the temperature is still being evaluated at the centroid, at a different integration point, or what?
Answer:
The error only affects the coefficient of thermal expansion (CTE), the instantaneous coefficient of thermal expansion.
PLANE42 has 4 integration points. The CTE using the correct temperature at point 1 is called C1, point 2 is C2, etc. Also the CTE using the correct temperature for the element centroid, is CC.
In Release 9.0, the CTE using the temperature computed at point 1 is called A1, point 2 is A2, etc.
Thus, the erroneous usages may be summarized:
A1 = CC
A2 = C1
A3 = C2
A4 = C3
In other words, it's one step behind.
Desired, of course, is;
A1 = C1
A2 = C2
A3 = C3
A4 = C4
which is what is in version 10.0. |
Question:<br><br>Class 3 Error Report no. 2005-08 states that the temperature is evaluated "elsewhere within the element". Does this mean that the temperature is still... |
Q. I am attempting to generate a tet mesh in ICEM CFD 5.1
I can mesh the volume fairly coarsely at about 200000 elemets, but when I try to generate a more refined mesh of around 500000 elements using 'natural size' and 'refinement' settings, I get a message saying that, 'faces are missoriented' and several thousand additional messages along the lines of 'face at 1 2 3 has one volume neighbour and no shell element'. The volume mesh appears to be created successfully, but when loaded into CFX-PRE there is a surface element set created 'inside' the volume (I guess this is all the misoriented faces from ICEM) which means the Pre-Processing cannot be set up correctly.
A. I would recommend that after creating the tet mesh smooth it and then run Mesh > Check Mesh. This will highlight any problems in ICEM before export. If there are problems, you can either try to fix or change the geometry and/or mesh settings. Alternatively, with more experience, you could try to fix the problem manually by creating a subset when prompted (this will allow you to locate the problem). The edit mesh tools can then be used to fix any problems. |
Q. I am attempting to generate a tet mesh in ICEM CFD 5.1<br><br>I can mesh the volume fairly coarsely at about 200000 elemets, but when I try to generate a more refined mesh of around... |
Q. I have been trying to access TurboGrid 1.6 but the graphical user interface does not appear when I click on the button in the bottom left hand corner of the application manager. All other attempts to open TurboGrid from other buttons and program menus have also been unsuccessful. I thought this might be due to a license problem but when I click on CFX License Manager > Available, there appears to be licenses for TurboGrid. All other components are also working ok (BladeGen, CFX-Pre, Solver and Post). I am running TurboGrid on a Windows machine.
A. This sounds like a typical problem relating to the installation of Exceed and Exceed3D. Make sure that Exceed and Exceed3D are fully installed. |
Q. I have been trying to access TurboGrid 1.6 but the graphical user interface does not appear when I click on the button in the bottom left hand corner of the application manager. All other... |
Q. How can I increase the integer stack memory size to the solver in CFX-5.7?
A. Within the Solver Manager, you need to select the Advanced option on the Solver Manager panel and set the Solver Memory factors. You can either set a general scale factor or detail the individual memeory arrays separately. |
Q. How can I increase the integer stack memory size to the solver in CFX-5.7?<br><br><br>A. Within the Solver Manager, you need to select the Advanced option on the Solver... |
Q. Can I simulate the seals within a turbine passage using CFX-TurboGrid?
A. No, I'm afraid this is not possible as TurboGrid is specifically tailored towards bladed passage rows. It utilizes the meridional section only for the blade passage and therefore |
Q. Can I simulate the seals within a turbine passage using CFX-TurboGrid?<br><br>A. No, I'm afraid this is not possible as TurboGrid is specifically tailored towards bladed... |
When I attempt to create a large mesh interactively using Tetra, the memory requirements exceed the available memory on my machine. Is there any way to overcome this problem? |
You should find that you can cope with considerably larger meshes by running Tetra in batch from the command line. By running the mesher separately from the mesh editor, less memory is required. A... |
After I uninstalled ANSYS Workbench 10.0 Preview 2 from my Windows XP PC,
I installed the production build of ANSYS Workbench 10.0. However, some of
the windows are now messed up. For example, in DesignModeler 10.0, the
Tree Outline pane is missing and the Details View pane is blank. Issuing
View > Restore Original Window Layout
does not clear up the problem, either. Why? |
There is a conflict with some of your old preference settings that need to get<br> wiped out, so that a new, correct set of preference files will automatically be<br> created... |
Is DesignXplorer available on the Unix platforms; HP, Sun, Linux? |
No, DesignXplorer was not ported to the Unix platforms. There are currently no plans as of 7/5/2005 to do so.
|