Why doesn't an ANSYS pipe model of a u-tube produce any reaction force? There should be end forces and the "u" should want to open up. |
The ANSYS pipe elements are assumed to be capped by default. KEYOPT(8)=1 can be used to specify open ends.
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How to define the damping in Component Mode Synthesis Analysis? There doesn't seem to be any provision for a damping matrix as with normal superelements. |
The CMS superelements do not compute a damping matrix in ANSYS at 11.0. The damping can be applied to them in the use pass.
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How could a PSD response analysis of a fuel tank, including fuel, be done? |
In the PSD analysis below, a 0.5 inch thick steel container is modeled with SHELL63. Inside the container, a fluid is modeled with... |
What does damping mean in a modal analysis? |
It depends on the type of modal analysis:<br><br>1. In a QRDAMP modal analysis, MP,DAMP is material dependent "beta" damping (K matrix multiplier.) [Ref: Table 5.6 of... |
Unigraphics UG NX models fail to attach into DesignModeler, however the same model attaches successfully into Simulation. Unigraphics runs correctly, and the plugin is confirmed to be installed correctly.
DM posts an error dialog reading:
Error: Attach Failed
Context: Attach Feature Attach1
UG posts an error dialog reading:
*** ERROR code 1020005 at line 80 in .agUtil.cpp:
+++ Invalid file name
UF_PS_export_data(body_list, pName);
What could be the problem? |
The user login name should not contain extended ASCII characters. (e with an accent, U with two dots above, etc). The UG-DM translator is different from Simulation, in that uses a direct Parasolid... |
Why is Simulation making the modal prestressed for this model with no loads? |
Some of the contact has "specified offset" requested in the advanced features. This can act as a load, so that is what Simulation is detecting. If this is changed to "adjust... |
For a simple uniaxial compression test, the reported stresses are not continuous. It seems as though local unloading occurs. This is physically not correct. For parameters psi<1, the surface is not convex anymore! This is also unphysical. See attached PDF. Is this a code defect? |
It is not a defect.<br>(1) Yes. Yield surface can be nonconvex at the ratios below some values. Consider Fig 4.11 of Theory Manual (with psi<0.80).<br>(2) Drucker's... |
Does the Workbench 11.0 / 11.0 SP1 plugin provide support for SolidWorks 2008? |
Informal testing and feedback from customers indicate that WB 11.0/11.0SP1 will work with SW2008 with exceptions as follows:<br><br>- In "Plugin" mode with CAD model open... |
I created a test model to understand the sewing tolerance, which could be set inside the midsurface operation, but I could not find out how it should work. Could you please explain me how to use this tolerance? |
The mid-surface feature works by first generating the mid-surface for each face pair individually. The thickness of the body for each face pair is also computed. Then, the next step is sewing. DM... |
How can I write a JScript macro for Workbench Simulation that will update the tabular data of a pressure load? |
Please see the attached example dsdb and macro. Examine the load in the tree before and after running the macro, which I tried to comment heavily.
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Customer has a new XP x64 computer. They have loaded SolidWorks 2007 on it and now ANSYS V11 SP1. ANSYS works fine and the interface to ProE works fine. However, the interface for SolidWorks does not appear in SolidWorks when trying to use the interface. The Geometry Interface for SolidWorks was chosen during setup and there were no errors during install. What needs to be done to show the ANSYS interface? |
Open SolidWorks and go to: Tools->Add-Ins. Check ANSYS Interface so that it is loaded when SolidWorks starts up.
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**** Entered By: rlange @ 01/17/2008 03:40 PM ****
Q.I 'm trying to solve a heat transfer problem with Solid domains, but it's giving unrealistic temperatures and generating heat where there shouldn't be any. What could be wrong?
A. The most likely root of the problem is the domain interface connections. Rather than leave them at automatic, they should be changed to GGI. |
**** Entered By: rlange @ 01/17/2008 03:40 PM ****<br><br>Q.I 'm trying to solve a heat transfer problem with Solid domains, but it's giving unrealistic temperatures and... |
Making an exact duplicate of my model in another region of space reduced the initial contact stiffnesses reported by the CNCHECK,DETAILS command. Why? |
The algorithm that calculates the initial contact stiffness for the 17X elements considers the model size. As the model gets larger, it becomes more difficult to solve due to the increase in... |
Class 3 Error
SYMPTOM:
The variables 'Group I Diameter', 'Group I Mass', 'Group I Lower Mass', 'Group I Upper Mass', and 'Group I Index' return the 'Group J' values instead of the 'Group I' values if they are prefixed by a Musig Fluid name. For example, 'Group I Diameter' is correct, but 'Musig Fluid 1.Group I Diameter' is incorrect.
PROBLEM:
The CFX Solver incorrectly accesses the |
WORKAROUND:<br>Use the variable names without the Musig Fluid name prefix when possible.<br><br>FIXED IN:<br>ANSYS CFX Release 12.0. A custom executable for ANSYS CFX... |
Class 3 Error
SYMPTOM:
For boundary mass sources, the 'Specified Mass Fractions and Local Temperature' value for Sink Option gives an energy source based on an enthalpy value evaluated from the specified mass fractions and local hybrid temperature, when it should be evaluated using the conservative temperature, which may be quite different at a wall.
PROBLEM:
The CFX Solver incorrectly calculates the secondary energy source that exists because of the |
WORKAROUND:<br>No workaround is available.<br><br>FIXED IN:<br>ANSYS CFX Release 12.0. A custom executable for ANSYS CFX Release 11.0 SP1 is available on request.
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Class 3 Error
SYMPTOM:
If a run, which includes periodic boundaries, also has mesh adaption, any new nodes that the refiner creates at a periodic boundary may be unattached at the corresponding periodic boundary. This can lead to the CFX Solver computing a solution in which only the original nodes on the periodic boundaries recognize the periodicity of the problem, and thus the solution will be corrupted.
PROBLEM:
This is due to a bug in |
WORKAROUND:<br>No workaround is currently available. However, if the mesh refinement only takes place in regions away from the periodic boundaries, then there will be no error in the... |
The plugin does not show up when installing Workbench. How do I install the plugin for OSD 2007 with Workbench 11.0 SP1 |
Below is a solution to installing OneSpace 2006 plugin with OneSpace Modeling 2007<br><br>Procedure that I followed to install is as below.<br><br>1. Install OneSpace... |
I'm running an axisymmetric problem, and the run stopped with the error message, "Subgrid xxxxxx has small cells on axis (<radius cutoff)." Please let me know what causes this problem and how to fix this problem. |
This message indicates that nodes of the specified part are on the symmetry axis so they have fallen within the limit of the radius cutoff.<br><br>If this error message came... |
Class 3 Error
SYMPTOM:
If an Additional Variable is transferred across a Fluid-Solid Interface, then the Additional Variable is not correctly conserved in a case with turbulent flow. This can be seen by inspecting the "Boundary Flow and Total Source Term Summary" section of the CFX-Solver Output File, where the amount of Additional Variable leaving the solid side of the Fluid-Solid Interface is not equal to the amount of Additional Variable entering the fluid side of the Fluid-Solid Interface.
In addition, for both laminar and turbulent flow, the hybrid values of the Additional Variable calculated by the solver on the Fluid-Solid Interface are incorrect.
This only affects cases with GGI interfaces. It should also be noted that the transfer of Additional Variables between fluid domains and solid domains is a beta feature and cannot be set up in CFX-Pre unless beta features are enabled.
PROBLEM:
The solver does not correctly calculate the Additional Variable flux into the control volume on the fluid side of the Fluid-Sol |
WORKAROUND:<br>No workaround is available.<br><br>FIXED IN:<br>ANSYS CFX Release 12.0. A custom executable for ANSYS CFX Release 11.0 SP1 is available on request.
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Is LS-DYNA fully supported by ANSYS 11.0 SP1 on Windows Vista 32-bit and 64-bit? |
Yes, ANSYS/LS-DYNA is supported on Windows Vista 32-bit and 64-bit.
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I don't understand the sensitivity plots in DesignXplorer. They are displayed using positive and negative numbers in both bar and pie charts. What is the significance of the sign and the number? |
The sensitivities essentially indicate the effect on a given output that a single parameter variation will have. There is a slight difference in how the numbers associated with sensitivities are... |
I can't see the project tree (or some other dockable item). |
Please try clicking "View" > "Windows" > "Reset Layout" before contacting tech support.
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Is it possible to introduce mesh motion in a domain that is defined as porous? There is a a pull-down menu for "Mesh Deformation" in the "General Options" tab, but unlike for a fluid domain, the only possible option seems to be "None", i.e. no mesh motion. |
<br>The combination of 'Mesh Deformation' and 'Porous Domain' is not yet supported (ANSYS CFX 11.0).<br>You should be able to setup a case with mesh motion,... |
When I attempt to run ANSYS Workbench 11.0SP1, the program hangs with a message "Workbench is Configuring". |
The "Workbench is Configuring" message is normally displayed the first time the program is run by a user on a machine. Workbench is adding information to the user registry during... |
SYMPTOM:
When restarting a moving mesh calculation that uses the Second Order Transient scheme, initial jumps in the solution (e.g. pressure) may be apparent. the size of the jump is problem dependent.
PROBLEM:
Due to a bug in the solver, the transient term in the flow equations is assembled as first order for the first timestep instead of second order. The solver then switches to second order for the remainder of the calculation. |
WORKAROUND:<br>No workaround is currently available.<br><br>FIXED IN:<br>ANSYS CFX Release 12.0.
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