At ANSYS 8.1 and earlier releases, the calculated S11 parameter (using SPARM.MAC) for a half symmetry stripline model having PML at either end (to prevent reflections) and no discontinuities between the ends, is far from 0. It should be zero (or very close to it). The value of S11 reported by the older TLSPRM.MAC is correct (close to zero). Is this a bug? |
Yes. This is defect 25932, which was fixed at release 9.0.<br><br>To run half symmetry TLINE models at 9.0, the user must now set VAL3 = 0.5 in the HFPORT,,TLINE command (this is new... |
Are there any plans to support Workbench on the AMD and Itanium 64-bit platforms?
If so, what will be the OS version for these platforms? |
As of now, the plan is for an Itanium2 64-bit Workbench at the 9.1 release.<br>We are currently trying to decide what our release plan will be for the extended systems (AMD Athlon 64, AMD... |
Does SFSCALE scale real and imaginary pressures on SURF154 elements? |
Yes, the format of the command is:<br><br>SFSCALE, Lab, FACT, FACT2.<br><br>FACT will scale the real pressure and FACT2 will scale the imaginary pressure.
|
QUESTION:
SFA is used to apply a heat flux to an area. The db is archived (cdwrite,all,test,cdb), the database is cleared, and the files are read back in (cdread,all,test,csb).
SFELIST shows the hflux properly applied. SFALIST indicates that a convection load was applied with a bulk temperature of a nearly infinite value (e31). The convection load is transferred to the elements during solve and the problem errors out during solution due to the tbulk.
Is this a bug?
ANSWER:
Yes, this is defect 19763, which was fixed at release 9.0 |
QUESTION:<br><br><br><br>SFA is used to apply a heat flux to an area. The db is archived (cdwrite,all,test,cdb), the database is cleared, and the files are read back in... |
Customer was successful in downloading the ICEM 5.0 encrypted file to a local Unix machine using command line ftp.
He was able to decrypt the downloaded file, but when he tried to un-tar it (tar -xvf), he got the following error:
tar: directory checksum error
What is the cause of this error? |
This error is usually caused by a bad decryption (wrong password) or the file did not download completely.
|
A hole in the middle of a 2D axisymmetric Mooney Rivlin rubber model is enlarged by a block that is displaced radially outward. Surface to surface contact is defined between the block and the hole. The solution fails to converge due to an element formulation error. Can you suggest anything that would help? |
The following changes led to a successfully converged solution for this particular model:<br><br>1) CONTACT:<br>a) Switch from Augmented Lagrange to Lagrange +... |
When trying to launch Ansys8.1 on a SUN Blade 1000 (US III) Solaris 8, the following error is encountered:
ld.so.1: /test123/v81/ansys/bin/usIII/ansys.e81: fatal: libz.so.1: open failed: No such file or directory
Killed |
According to Sun, Patch 112611-02 contains libz.so.1.<br>Have the user install this patch. This should fix the error.
|
A customer noticed the ANSYS Workbench solution appeared to hang when it completed. The solution information showed the last message written before the hang was "ACTIVATE ERROR ESTIMATION CALCULATIONS". It appeared that the error estimation was causing the problem. What's wrong? |
There is a known issue which came up with MacAfee's latest version (which we here at ANSYS have installed). Essentially MacAfee is attempting to scan a small solver file while we try to... |
I get the following error when trying to use curve fitting to create a hyperelastic foam material model when compressive (negative values) uniaxial data was supplied to the curve fitting solver.
*** WARNING *** CP= 9.484 TIME= 13:25:08
Base term is negative in Base^Exponent. Absolute Value of Base Term is
Used
Then I get a visual C++ runtime library error and ANSYS aborts.
Is this a bug? |
Yes.<br><br>In fact this was working fine in 8.0. If you have 8.0, you should be able to fit uniaxial compression data.<br><br>(-ve strains,-ve... |
I'm attempting to run ANSYS LS-DYNA in batch mode and get the following error:
*** ERROR *** CP= 4.609 TIME= 16:46:48
The EDUI command is either not available for this version of ANSYS or
the appropriate product was not selected for this session.
Contact your ANSYS support person for more information.
What am I doing wrong? |
EDUI refers to 'Explicit Dynamics User Interface', or the ANSYS LS-DYNA Drop Test Module.<br><br>To resolve the problem, include '¿dtm' as an... |
I try to use EDFPLOT,1 to show applied pressures on SOLID168 elements but it does not appear to work. It does work for SOLID164 elements. What am I doing wrong? |
Enhancemnt Request 345918 has been submitted regarding this issue.
|
A user has installed ANSYS v9.0 preview 3 on a machine with the following configuration:
AMD Opteron 250 with SuSE Professional 9.1
When he tries to start ANSYS, he receives the following error message:
master:/ansys_inc/v90/ansys/bin # ./ansys90
/ansys_inc/v90/ansys/bin/linop64/ansys.e90: /ansys_inc/v90/ansys/syslib/linop64/
libgcc_s.so.1: version `GCC_3.3' not found (required by /usr/lib64/libstdc++.so.
What is causing this error? |
ANSYS 9.0 is not supported on AMD Opteron running SuSE 9.1.<br>We are building on and supporting SuSE SLES 8.<br><br>We do have an in-house AMD Opteron machine running SuSE 9.0,... |
Which versions of Linux will ANSYS Workbench 9.0 be certified on? |
Workbench 9.0 is the first version to be supported on Linux.<br><br>It is supported/certified on REDHAT 7.3.<br>Certification will be done on REDHAT 8.0 and REDHAT... |
Are there any examples of the new (ANSYS 9.0) SOLSH190 solid-shell element? |
Yes, please see the ANSYS 9.0 example below created with the UP20040915 build.<br><br>Note: If you encounter problems with data below, please use the attachment... |
The vorticity variable is an internal solver variable. By default it is not written out to the results file, but if you want to make it available you can create a file called e.g. vorticity.ccl containing the following lines:
LIBRARY:
VARIABLE: vorticity
Option = Definition
MMS Name = VORT
Long Name = Vorticity
Tensor Type = VECTOR
Quantity = Shear Strain Rate
Status = D
CEL Root =/FLOW/PHYSICS/{Zone}/{Fluid}
User Level = 2
Output to Jobfile = No
Output to Postprocessor = Yes
Component Short Names =
vorticity x,
vorticity y,
vorticity z
Component Long Names =
Vorticity x Component,
Vorticity y Component,
Vorticity z Component
Component MMS Names =
VORT-1,
VORT-2,
VORT-3
General Availability = ADAPTION, RESULTS, MONITOR, CEL
Variable Scope = PHASE
Variable Class = HYDRO
Field Variable = True
END
END #LIBRARY
You can then perform your run from the command line typing: cfx5solve -def myfile.def -ccl vorticity.ccl
Or if using the solver manager, on the 'Define Run' form, select the definition file & turn ON 'Show Advanced Controls. On the 'SOLVER' tab, enter the following in the 'Solver Arguments' box
-ccl vorticity.ccl
The results file will then contain the vorticity variable.
The lines above come from the VARIABLES file, located in CFX5_INSTALLATION_DIRECTORY/etc. |
The vorticity variable is an internal solver variable. By default it is not written out to the results file, but if you want to make it available you can create a file called e.g. vorticity.ccl... |
How can I include the applied pressure value on an element plot in ANSYS? |
The input below demonstrates the use of /PSF and /PNUM to include the applied element pressure value on a plot. The /PSF command is under PlotCtrls > Symbols. The /PNUM command turns on... |
After installing Workbench 8.1 (CAD2Mesh) on RedHat 8/9 Linux, I get the following error when trying to run DesignModeler 8.1: "Unable to resolve function glXQueryExtension" and DM does not run. |
This error is caused by missing OpenGL libraries. Installing the XFree86-devel-4.2.0-8 package and required dependencies should fix this problem.
|
A customer has run a transient mode-superposition analysis at 7.1, 8.0, and 8.1. The transient timestep solutions are considerably slower at 8.0 and 8.1, compared to 7.1. For one particular test case, the CP time required to complete a transient timestep is 30 times slower at ANSYS 8.0 (compared to ANSYS 7.1), and is 35 times slower at ANSYS 8.1 (compared to 7.1). |
This was filed as Defect 24553, and has been fixed at 9.0. The run times have been improved at 9.0 to be faster than those for 7.1.
|
Do you have an example illustrating the use of foam material model in LS-DYNA and/or determining net impact force in a drop test simulation? |
The attached input file, presentation, and animation may be helpful to you.
|
Q. How to add the Time Value/Time Step information in a transient animation in CFX Post.
A. Create> ABC Text. On the definition form for the Text item, turn on 'Embedded Auto Anotation'. For TYPE select 'Time Value' or "Time Step'. Apply.
This will create a Time = x [s] or Time Step = x entry in the Viewer, which is automatically updated when the animation is played. You can also add more than one 'Auto Anotation' by clicking on the MORE button in the definition form. |
Q. How to add the Time Value/Time Step information in a transient animation in CFX Post.<br><br>A. Create> ABC Text. On the definition form for the Text item, turn on... |
The Elements Manual states that the wave amplitude, ETA, is calculated at the integration points. The Theory Manual states that there are no integration points for the stiffness and mass matrices, but there are two integration points for the hydrodynamic loads. Are there integration points for the PIPE59 element, and, if so, where are they located? |
For most elements, integration points are used to perform the numerical integration necessary to form the various matrices. For some elements, like most beam and pipe elements, we know the closed... |
In ANSYS 8.1, when running a thermal analysis with SHELL131 and postprocessing heat loss using FSUM, a confusing mix of HEAT and multiple HTOP values associated with SHELL131 are reported in output. How are these multiple heat calculations to be interpreted? |
This is a code defect (# 27977) with regards to SHELL131 and FSUM command in /POST1. It has been corrected for ANSYS 9.0.<br>The first non zero HEAT or HTOP value should be the correct heat... |
Do you have an example demonstrating the use of magnetic contact elements in which the air gap mesh is entirely eliminated and effectively replaced by using the MCC (permeance) real constant? |
Attached are 2 input files. One creates a permanent magnet model and keeper immersed in a contiguous air mesh, the other has a modestly large void in the mesh where magnetic contact elements are... |
The SUCALC,,,ATAN2 command in ANSYS gives same answer as the SUCALC,,,ATAN command. Why is this? |
This is a documentation error both in the online docu and in the GUI dialogue box that has been corrected at ANSYS 9.0, which is due out 4th quarter of 2004.<br>(Ref. Defect Report... |
######## WORK NOTES COPIED FROM INCIDENT 349043 ########
--------------------------------------------------------------
QUESTION:
I modeled a multiply connected magnetic region with SOLID96 and SOLID117 (C core with a permanent magnet in the airgap). In both models, all boundaries were made flux parallel. Results differs substantially. The SOLID96 MSP predicts circulation of flux around the core and through the PM. The SOLID117 edge-flux predicts flux emerging from one PM pole doubling bacK through adjacent "air" into the other PM pole, with NO circulation in the core. A 2D MVP model agrees with the 3D SOLID96 model. Why does the SOLID117 predict these seemingly counterintuitive results? Models are attached to this solution.
ANSWER:
In Emag problems with edge-flux elements (SOLID117),
the "flux parallel" boundary condition (AZ=0) can do more than set a local
condition that B is parallel to the boundary. If applied on surfaces forming
a multiply connected region, it also creates a global condition that there
is zero net flux through any area for which the boundary lies entirely in
those surfaces. The reason is obviously that setting AZ=0 for a set means the
line integral of A over any chain of nodes belonging to the set is zero.
DETAILS:
In the attached input file:
method=1 ! set method=0 to use edge-flux, 1 to use scalar potential
multconn=1 ! set multconn=1 to make hole in air (and make the boundary multiply connected)
! The following combinations give the results an uninformed user would expect:
! method=0 , multconn=0
! method=1 , multconn=0
! method=1 , multconn=1
! The combination method=0, multconn=1 gives "incorrect" (or at least misleading) results
! since it's actually a very different physical system that gets modelled.
NOTES:
Not yet clear what action, if any, shall be taken regarding element formulation. |
######## WORK NOTES COPIED FROM INCIDENT 349043 ########<br>--------------------------------------------------------------<br><br><br><br>QUESTION:<br>I modeled... |