How can I restore the original window layout for Design Modeller? |
Select Menue View -> Restore Original Window Layout in Design Modeller.
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On the Domain Form in CFX-Pre why can't I select the Material I have just created? |
Check that you have specified the necessary Transport Properties (Dynamic Viscosity and/or Thermal Conductivity) on the Material Properties tab of the Material form.
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According to the documentation, you can change the Design Life under Tools > Options. However, the change isn't taking effect after running a prior simulation, even after getting out and back into Workbench and solving again. The updated value shows up in Tools > Options, but the value used in the Fatigue results is still the default 1e9. How do you get that change to take effect? |
If you change the Design Life value in the Fatigue Options, you must first DELETE the fatigue object (such as Damage), then insert it anew. You will then notice that your Option-specified Design... |
Several pop-up windows (panels) of CFX-Pre do not appear. For instance the client can create a new domain name (the small pop-up window for assigning a name appears), but the subsequent pop-up window for defining domain properties is not appearing on the screen. Occured for CFX-5.7.1 and CFX-10 on Windows 2000 SP4: |
Settings in the user preferences in the (hidden) directory C:Documents and SettingsUSERNAME.cfx have settings for displaying the pop-up windows outside of the current visible screen. Sometimes... |
In ICEM tetra what does the Laplace smoother do? |
The Laplace smoother is a mesh smoother that only operates on surface meshes. It generally gives a more uniformly spaced mesh and, as such, can help to eliminate some of the Octree-ness of the... |
How do I determine net volumetric flow at an inlet or outlet using FLOTRAN? |
The attached input file demonstrates calculation of net inlet/outlet volumetric flow using surface integral commands. It also reports net viscous shear on the inner tube surface. This input... |
I receive the following error whenever I try clicking any sub-menu under 'Help' from the ANSYS CFX 10.0 Launcher or any of the ANSYS CFX 10.0 products (CFX-Pre, CFX Solver or CFX-Post):
HelpError
Error returned from Help viewer:
initialiseJARReader: Environment variable CFX5JAVA not set |
First confirm that you installed the Sun JAVA 2 Runtime Environment as well as the ANSYS CFX 10.0 software from the installation CD. This is needed for the ANSYS CFX 10.0... |
I'm running a particle tracking problem with a large number of particles. I'd like to be able to compute some statistics for particles which terminate on a specific boundary. I want to use a Post session file to do this but I don't know how to get the list of particles which end on this boundary into a Perl variable. I see how to get this last using the info window on the Particle Track object in an interactive session of Post, but how can I do this in batch or in a session file? |
You can use the following approach.<br><br>1. Create a Particle Track object which uses the ending location as the filter. Set the maximum number of tracks to be high enough to... |
I would like to know if ANSYS has orthogonal visco-elastic material properties for use with composites?
My understanding is that neither NASTRAN nor ABAQUS offer this. I use both composites and viscoelasticity
and have structures that require both. Can ANSYS solve this problem? |
The answer to your question is a definite maybe.<br><br>We can do orthotropic elastic materials but the relaxation using the Prony series will be isotropic. Meaning that<br>the... |
After RESUMing a db file created in ANSYS Release 9.0 or earlier into Release 10.0, why does the program abort when CDWRITE or PARSAV,ALL is issued? |
There is a defect (#38590) regarding string array dimensions. A string array can have a first dimension of up to 128. However, Release 10.0 multiples the first dimension of a string array by a... |
I receive the following error when trying to access CFX Help:
InitializeJARReader : Environment variable CFX5JAVA not set. |
Run the CFX 10.0 setup again and choose to install Java 2 Runtime environment. After doing so, the Help should operate correctly.
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My Workbench model (dsdb) contains a Point Mass. When I open this model in FE Modeler and Generate Data for any target system (ANSYS, ABAQUS, or NASTRAN), the point mass does not appear in the finite-element model. Why isn't the point mass included in the FE model? |
FE Modeler can recognize only entities and features that are attached to the underlying geometry. Because WB Point Masses are not attached to any geometry, FE Modeler doesn't even know... |
Why were references removed from the 10.0 Distributed ANSYS documentation for the Windows platform? |
At ANSYS 9.0, Distributed ANSYS was Beta on the Windows Platform, however the Shared Memory Distributed Solvers<br>were not. Distributed ANSYS and Distributed Solvers shared the same... |
Thermal DOF coupling (CP's on TEMP) are introduced in a restart of a thermal transient analysis having nonlinear (temperature dependent) properties. It doesn't look like ANSYS is honoring the couples. What's wrong? |
CP¿s will work in a transient thermal restart if the model is linear (material properties not a function of temperature). They will NOT work if the model is nonlinear (properties ARE... |
I have observed puzzling behavior in a nonlinear solution. In my output file, after a converged substep at TIME = 39.8846, a next step with NEXT TIME INC = 0.15928E-01 is attempted, but fails to converge due the DOF limit being exceeded. The program then says it bisects, but the time step size does not change: NEW TIME INCREMENT= 0.15928E-01. In this bisected solution, the incremental plastic strain computed is larger than the criterion of 15%, leading to another bisection. This time, the time increment changes only slightly: NEW TIME INCREMENT= 0.15359E-01. With this setting, the substep converges.
Why does the timestep size not change at all in one bisection, and change only slightly in the other bisection? |
This behavior becomes less puzzling when one realizes how the gradual changes to the Bisection feature have given the term ¿Bisection¿ an evolving meaning in ANSYS. Over the years,... |
QUESTION:
A user had a simple drop test analysis using ANSYS/LS-DYNA (either Rev 9.0 or 10.0). They only intended to test the technical capability that allow to switch parts from deformable to rigid and back to deformable during an analysis.
- 1st step : drop test up to 0.01 sec (new analysis)
- 2nd step : the structure is switched from deformable to rigid from t=0.01 to t=0.02 s (first restart)
- 3rd step : the structure is switched back to deformable (second restart) from t=0.02 to t=0.04 s.
Problem : The time-step at the end of step 2 (first restart) which is 10-5 s (as requested by user) is not recomputed by LS-DYNA during the 3rd step when the structure is switched back to deformable. Its value should normally be in accordance with the Courant condition for deformable solids (roughly 10-6) and not 10-5 s.
It appears that the source of the problem is that the LS-DYNA ".r" restart file that has been automatically generated by the ANSYS interface for the 2rd step contains part deletion commands that have never been requested by the user. If you run the analysis using a corrected ".r" file (i.e. without part deletion commands) it works fine.
ANSWER:
For this particular model, the problem was with three lines of data in drop.cdb.
*SET,_PARTSEL, 1.000000000000
*DIM,_PSEL ,ARRAY, 6, 1, 1,
*SET,_PSEL ( 6, 1, 1), 1.000000000000
These three lines of data are un-selecting parts 1-5.
That's why *DELETE_PARTS are written in file.r.
By including PARTSEL,'ALL' command in drop.run, the third step (after the rigid to deformable switch) works as documented. |
QUESTION:<br><br>A user had a simple drop test analysis using ANSYS/LS-DYNA (either Rev 9.0 or 10.0). They only intended to test the technical capability that allow to switch parts... |
Customer gets the following error when trying to install ANSYS 9.0:
The image file D: is valid, but is for a machine type other than the current machine.
What is causing this error? |
The customer was trying to install IA 64 image on an x64 box, which doesn't work. ANSYS/WB 10.0 x64 will be released in the fall. The customer can try the IA 32 install for now, that should... |
When I try to open a geometry file in DesignModeler 10.0, I am unable to Restore Original Window Layout or resize the panes for Model Tree, Detail and Graphics View |
This problem may occur if a preview version of V10.0 had been installed on the machine.<br> Uninstalling / reinstalling Workbench will NOT resolve this... |
The CFX license daemon is not running on newer Linux operating systems, error message wrt. GLIBC_2.0
'lmgrd: symbol errno, version GLIBC_2.0 not defined in file libc.so.6 with link time reference' |
Set LD_ASSUME_KERNEL=2.4.1 as environment variable.
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I have a set of runs that needs to be solved. Is there a way I can define
a list of runs to start one after another in the solver mode. For example,
run #1 start in parallel mode, runs until max number of iteration is
reached or residuals are reached, stop solver, start run #2 and repeat
until all runs on the list are completed. |
<br><br>This can easily be done using Perl scripts.<br><br>An example which modifies a flow rate and uses results from previous runs as a restart for<br>subsequent... |
I have just installed ICEM CFD 10.0 and when I try to run it I get a pop-up containing the following message:
AI*Environment 10.0 Initialization Error
ansys license 241 is not available in the license file
failed to get ansys license 241: return code -21, unknown error
I have the ansys licensing running and this was not interfered with before, during or after the installation of ICEM CFD 10.0. |
This happens when you are trying to use a version of the software which was released after your TECS contract expired.<br><br>If you have a Paid Up license for any of the ANSYS ... |
When User tries to start the ANSYS 10.0 License Manager on an HP64 machine, the following errors are received:
/usr/lib/pa20_64/dld.sl: Unsatisfied data symbol 'pL5rUm' in load module '/ansys_inc/shared_files/licensing/hp64/ansyslmd'.
/usr/lib/pa20_64/dld.sl: Unsatisfied data symbol 'teocZi' in load module '/ansys_inc/shared_files/licensing/hp64/ansyslmd'.
/usr/lib/pa20_64/dld.sl: Unsatisfied data symbol 'eF6CFD' in load module '/ansys_inc/shared_files/licensing/hp64/ansyslmd'.
/usr/lib/pa20_64/dld.sl: Unsatisfied data symbol 'og7JhW' in load module '/ansys_inc/shared_files/licensing/hp64/ansyslmd'. |
This is a known Problem. Replace the ansyslmd on the system with the ansyslmd attached to this solution.<br><br>User can also receive a status 0 in the License .log:<br>If you... |
I am using the input file appearing in Fluid Analysis Guide Section 16.3.3. I cannot figure out how to plot the calculated structural mode shapes and contour the squeeze film element pressure. |
This input file uses the RMFLVEC command and subsequently calls the ABEXTRACT command macro (which in turn places 2 calls to another macro called DMPEXT - once for each of the 2 beam mode shapes).... |
QUESTION:
Do you have an example demonstrating the procedure for modeling a single pole antenna located above an infinite conductor plane, but not touching the plane? I want to add a voltage excitation. I am interested in
- Close Field
- Far Field
- Antenna Impedance
- Total Current along the antenna
My questions are:
- Do I need to mesh the antenna as a volume or a line?
- If I have to volume mesh the antenna, do I need to use a 'skin' thickness, as I am interested in the current around the antenna, and not the internal current?
- How can I apply the voltage ( where do I apply the 2 values to create the difference of voltage)?
- How far do I need to mesh around the antenna?
- How can I use symmetries in the model?
- Which elements should I use on the boundaries?
ANSWER:
See the attached example (ANSYS input file) plots and animation.
In words, answers to questions are:
- I would model the antenna as a cylindrical void. The surface should be PEC.
- Apply voltage with a COAX port
- Extent of mesh neednot be much more than 0.5 times antenna length. Experiment with parameters using the input file to make sure.
- Model 90 degree sector with PMC (naturally occurring) at 0 and 90 degrees.
- For PML ('perfectly matched layers') surround the computational domain with elements having keyopt(4) set to 1. |
QUESTION:<br><br>Do you have an example demonstrating the procedure for modeling a single pole antenna located above an infinite conductor plane, but not touching the plane? I want... |
Q. User is trying to model two offset surfaces, meshed with shell elements and tied together by MPC contact.
The simulation does not account for the bending moment that develops due to the offset. Is this a code defect or a limitation?
A. This is a limitation of default MPC contact. The solution is to set KEYOPT(5)=3 for the TARGE170 elements of the subject MPC contact pair. In workbench, add a command object to the contact pair to execute "KEYOPT,tid,5,3", where tid is the TARGE170 element type number. This switches the DOF set in the CEs to shell-to-solid. Hence, when the constraint equations are created, all six DOFs are used on the contact side of the pair, while only the translational DOFs are used from the target side. This has the effect of including bending due to offset. Unfortunately, we do not say this clearly in the documentation. A clarifying note will be added to the Contact Technology Guide at 11.0. |
Q. User is trying to model two offset surfaces, meshed with shell elements and tied together by MPC contact.<br>The simulation does not account for the bending moment that develops due to... |