Q) Can I export and isosurface from CFX-Post and bring it into ICEM?
A) You can actually use the print option in Post (only having the isosurface in the viewport) and printing to a vrml file. You can then import this geometry type into ICEM CFX. |
Q) Can I export and isosurface from CFX-Post and bring it into ICEM?<br><br>A) You can actually use the print option in Post (only having the isosurface in the viewport) and printing... |
Q. I have encountered the following error message in a FLOTRAN analysis. What should I do about it?
*** ERROR ***
Coefficient matrix has a negative diagonal.
Probably indicates divergent solution.
VX Node= 1341.
A. The negative diagonal error occurs due to spatial oscillations in the solution associated with the advection method. Most often, this happens near an the Outlet, and in turn means that the outlet region is too close to regions where the flow is undergoing changes.
If it is not possible to change the problem domain, the best thing to do is to use Modified Inertial Relaxation (as per the section on Advection Discretization in the Fluids Analysis Guide). It can be applied to temperature, momentum (as in this case, since the error was reported for VX) and turbulence.
See the FLDA,MIR command. Appropriate values are between 0 and 1. It is best to use as low as possible a number, but using 1.0 should be okay. Try 0.5 and raise it if necessary. Note that you may have to apply this to turbulence as well. |
Q. I have encountered the following error message in a FLOTRAN analysis. What should I do about it?<br><br> *** ERROR ***<br> Coefficient matrix has a negative... |
Q. What is the status of the Multi Body Dynamics software at 10.0?
How do you activate the license for it and is there any documentation available?
A. MBD capability is not commercial grade in v10. It will be in v11.
You need to choose the MBD module during install time to enable this feature.
After that, you need to have the beta key ON to access the module.
There is no help documentation available. |
Q. What is the status of the Multi Body Dynamics software at 10.0?<br>How do you activate the license for it and is there any documentation available?<br><br>A. MBD capability... |
Q. What are the units of Surface Tension as specified in the FLDA,NOMI,SFTS command?
A. The surface tension coefficient is specified in consistent units of Force/Length (or Energy/Area). |
Q. What are the units of Surface Tension as specified in the FLDA,NOMI,SFTS command?<br><br>A. The surface tension coefficient is specified in consistent units of Force/Length (or... |
Which releases of Redhat Linux are supported on the AMD Opteron platform? |
We have tested Redhat AS 3.0 and Redhat AS 4.0. The Workstation versions of Redhat should also work fine.
|
Is there a suitable boot file for a clean shutdown of the license server? |
There is no boot file needed for a clean shutdown. When the system is shutdown, all processes are shutdown accordingly.
|
I have a new Dell with Dual XEONs with the windows 64-bit operating system.
I tried to install the Windows IA64 ANSYS version, and it says it needs an Itanium.
Have I bought the wrong computer? What are my options? |
The ANSYS 10.0 IA64 download is specifically for the Intel Itanium processor.<br><br>The Dual Xeon machine running the Windows x64 Operating System is not supported yet.<br>We... |
Q. Why do I get surface temperatures HOTTER than my radiation source when using radiation in CFX? This seems to happen at the boundary b/w a symmetry plane and an adiabatic boundary.
A. In all likelihood, CFX has simply not converged yet. Radiation is of course highly non-linear. It is best to use as large a physical time step as possible (1.E+5 seconds as opposed to, say, 50 seconds) when solving Conjugate Heat Transfer problems in CFX. |
Q. Why do I get surface temperatures HOTTER than my radiation source when using radiation in CFX? This seems to happen at the boundary b/w a symmetry plane and an adiabatic... |
Customer tries to run the solution using remote solve. The case works just fine locally, and appears to work fine when using remote solve. Workbench then crashes when he tries to "get results".
What is causing WB to crash? |
This is a defect that is fixed in ANSYS/WB 11.0.<br>This error occurs on ASYNC solution ONLY if there is a CFX pressure load applied on the model.<br>This CFX pressure load is a new... |
I am modelling heat transfer across a wall that separates a compartment from environment. What is the right choice for boundary conditions ? |
If Biot number (Bi) << 1, heat flux needs to be prescribed; if Bi >> 1, temperature needs to be set. Anywhere in between, heat transfer coefficient needs to be... |
After configuring the connection for ProE with ANSYS 10.0, the user receives an error concerning MSVCR71.dll when trying to start Pro Engineer. |
Check the system PATH to verify that the following are at the beginning of the PATH:<br><br>C:Windows;C:Windowssystem32<br><br>(Control... |
Sometimes my models have temperatures below the lowest temperature load. How can this happen? |
Here are four potential causes:<br><br>1. The most common cause of such a temperature anomaly is a poor mesh -- either too coarse a mesh, or poorly shaped elements within the mesh. ... |
How can I schedule a CFX-10 run on Windows to start at a time in the future? |
If you go to the Start menu, then Control Panel, then Scheduled Tasks, you will see an application that you can use to schedule your CFX run.<br><br>From the application, select Add... |
If a pressure is applied to a free surface that comes into contact,
does the pressure remain active in ANSYS LS-DYNA? |
Yes. Please see the ANSYS LS-DYNA 10.0 example below (and<br> attached as well) that demonstrates this behavior.<br><br><br>! = = = = = = = = = = = = = = = = = = = = =... |
Q.. Where can I find a 2D FSI example that uses the Multifield Solver?
A. Use the input file listed below.
/batch
!!!!!!!!! Fluid Structures problem set up. Flow over a wall.
!! SI units are used Free stream velocity is 56m/sec
!! (about 125 mph). The wall is 4 meters high and
!! .25 meters thick.
!!
!! This file sets up and performs the Multifield analysis for
!! ANSYS8.0. Multiple Staggers
!!
!! Property/Multified modification of "fsi8.inp".
!!
!! Field 1 is the Fluid analysis
!! Field 2 is the structural analysis
!!
!! Create geometry
/prep7
et,1,141,,,,1
et,2,42
mp,ex,2,1.39E+8
mp,nuxy,2,.3
x0=0
hw=4
xw=4
ht=.125
xt=.25
dx=.25
d1=4
d2=4
y1=4
yh=.2
y2=8
y3=80
k,1,-ht,0
k,2,ht,0
k,3,-ht,hw
k,4,ht,hw
x6=ht+dx
k,6,x6,0
k,5,x6,y1
k,7,-x6,0
k,8,-x6,y1
k,13,0,hw+ht
k,14,0,hw+ht+yh
x9=x6+d1
k,9,x9,0
k,11,x9,y1
k,10,-x9,0
k,12,-x9,y1
x17=x9+d2
k,17,x17,0
k,15,x17,y2
k,18,-x17,0
k,16,-x17,y2
k,19,-x6-xw/3.,y2
k,20,x6+xw/3.,y2
xe=80
xs=-30
k,21,xs,0
k,22,xs,y2
k,23,xs,y3
k,24,-x17-xw/2,y3
k,25,-xw,y3
k,26,xw,y3
k,27,x17+xw/2,y3
k,30,xe,y3
k,29,xe,y2
k,28,xe,0
k,31,0,y2
k,32,0,y3
l,1,7
l,3,8
l,13,14
l,4,5
l,2,6
l,7,10
l,6,9
l,8,12
l,5,11
l,10,12
l,9,11
l,18,16
l,17,15
l,10,18
l,9,17
l,12,16
l,8,19
l,14,31
l,5,20
l,11,15
l,19,16
l,20,15
l,1,3
l,2,4
l,7,8
l,6,5
l,1,2
l,3,4
larc,13,3,4,ht
larc,14,8,4,4*ht
l,31,19
l,32,25
larc,13,4,3,ht
larc,14,5,3,4*ht
l,31,20
l,32,26
l,25,24
l,24,23
l,16,22
l,18,21
l,17,28
l,15,29
l,27,30
l,26,27
l,21,22
l,28,29
l,22,23
l,16,24
l,19,25
l,31,32
l,20,26
l,15,27
l,29,30
mx1=3
mx2=5
mx3=6
rx3=6
mx4=15
rx4=2
rxm4=1.5
mx5=10
rx5=2
mx6=30
rx6=3
mx7=12
rx7=-2
my1=12
ry1=-3
rym1=3
my2=40
ry2=3
lsel,s,,,29,36
lesize,all,,,mx2
lsel,s,,,1,5
lesize,all,,,mx3,rx3
lsel,s,,,6,9
lesize,all,,,mx4,rx4
lsel,s,,,21,22
lesize,all,,,mx4,rxm4
lsel,s,,,37,44,7
lesize,all,,,mx4
lsel,s,,,14,20
lesize,all,,,mx5,rx5
lsel,s,,,41,43
lesize,all,,,mx6,rx6
lsel,s,,,38,40
lesize,all,,,mx7,rx7
lsel,s,,,23,26
lesize,all,,,my1,ry1 |
Q.. Where can I find a 2D FSI example that uses the Multifield Solver?<br><br>A. Use the input file listed below.<br><br>/batch<br>!!!!!!!!! Fluid Structures... |
Customer has tested Windows 64-bit on INTEL and AMD processors and it seems that ANSYS runs faster on the Intel Em64T running Windows x64 than it does on an AMD Opteron running Windows x64.
1) Intel Xeon64 3.6Ghz
2) AMD Opteron64 252 (4.6 Ghz)
The AMD is a faster processor. Why does this occur? |
This is a known problem with 32-bit ANSYS on AMD 64-bit chips.<br>We are looking into it and it appears the problem is related to Intel¿s MKL library.<br><br>In short,... |
Why doesn't this Command Snippet return my parameters returned from Classic Ansys ?
When a user inserted the following Command Snippet, he expected to have the parameters my_temp1, my_temp2, my_temp3, etc returned. Instead, the parameter was named "my_tem%j%", and it was assigned a value of zero. Why?
next_n=ndnext(0)
*do,j,1,5,1
*get,my_temp%j%,node,next_n,temp
next_n=ndnext(next_n)
*enddo |
Workbench scans the commands in the Command object for variables. Only the variables found from scanning the Command Snippet are given return values. Therefore, forced substitution in parameter... |
I would like to use transient adaption, however, when I look in the manual for ANSYS-CFX 10.0 it says that I cannot use mesh adaption for transient problems.
How can I use transient mesh adaption? |
The transient mesh adaption is a beta feature. I enclose a document detailing how to use this in cfx10.<br><br>It is important to note though, that this is non-conservative. You can... |
The solver fails to pick up a user Fortran shared library when running on an Opteron, using the PGF90 compiler. However the shared library is present. |
Please note that this problem only occurs if the shared library has been compiled on a different machine from that used to run the solver. If this is the case, then the problem may be due to... |
Customer is using ANSYS 9.0 on HP-UX platform B.11.11 U 9000/785 and gets the following error.
An unexpected error ( Bus Error ) has occurred... ANSYS internal data
has been corrupted. ANSYS is unable to recover and will terminate.
Previously saved files are unaffected.
elm_WrkSpaceObj
lsstr
solvcl
slmenu
ANSYS
What is causing this error? |
This is most likely related to the patch level they are using.<br><br>By getting a libF90.sl from a pre May 2005 patched system and putting it in ansys/syslib/hp64 directory, the... |
How can I use the ANSYS License Manager with a Firewall? |
<br><br>1.) Change the license file and add a port number for the Vendor Daemon 'ansyslmd'. Ensure that this port number is not used by another program,... |
Is it possible to have different physics in different domains? |
Yes. By default, however, constant physics is enforced because in most cases, it is desirable. To enable the ability to model different physics in different domains, the environment... |
I have a number of CFX parallel process licenses which are served by two different increments in my license file.
If I have multiple parallel jobs going, I am sometimes not able to use all my licenses, since the licenses for
any single job must all come from one increment or the other (i.e. I can't take 4 from one pool and 6 from another).
Is there any way around this limitation? |
<br><br>The issue here is how FLEXlm pools licenses. Since the licenses may have different versions and expiration dates,<br>there are two separate pools of licenses. ... |
SYMPTOM:
When trying to install Ansys CFX Release 10.0 on an HP Alphaserver machine, the relevant OS package could not be found.
PROBLEM:
The HP AlphaServer Hardware Platform is mistakenly listed on the HP IA-64 CD. It is actually located on the SGI 64-bit CD. |
WORKAROUND:<br>Install the product from the CD labelled SGI 64-bit.<br><br>Note:<br>A sticker will be adding a sticker to the current stock of incorrect CDs that points... |
Customer configures RSM under WB 10.0 and when he tries to perform verify server function his communicaton channel appears to lock and
does not give a response. What is wrong? |
The customer is using the same machine as web server and compute server, which is a special case that slipped thru the doc cracks.<br><br>For windows server 2003, they need to run RSM... |