I would like to be able to animate streamlines so that I see the individual massless particles as they move through the flow field. I know that quick animation can be used to do this, but I'd like more control over the time interval between particle updates and the rate at which the animation will play. Is an example available? |
The easiest way to do this involves the use of keyframe animation and the display of symbols (not lines) for the streamline. You can control the interval between particles by setting it on the... |
Is there any way to expand a CMS superelement for all of the harmonic sweep solutions? |
At 12.0, you can get the complex solution for the whole frequency range with NUMEXP,ALL. At 11.0, you have to expand all of the real results and then all of the imaginary results separately, as... |
In ANSYS Release 11.0, does the number of modes used in a mode-superposition transient dynamic analysis have to be the same as the number of modes extracted from a QR damped modal analysis? |
Yes, the program requires that all of the extracted modes are used. This requirement will be removed from Release 12.0.
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In ANSYS Release 11.0, does issuing the SET command overwrite boundary conditions stored in the database? |
Yes, when the SET command is issued, displacement and force boundary conditions (D and F commands) are replaced by the corresponding values on the results file. In a single-load-step analysis... |
What does "general solver error" mean after a Simulation solution? |
When a run completes successfully (based on Solution Information), but then gives a "General solver error," it usually means Simulation could not find the results file. Additional... |
The BF command with temperature (TEMP) as function of X,Y,Z seems to work fine at 11.0.SP1; however, the following limitation from the documentation on this command suggests that it should not work:
"When using TEMP, you can define a one-dimensional table that varies with respect to time (TIME) only. When defining this table, enter TIME as the primary variable. No other primary variables are valid."
Should the use of BF with primary variables X, Y, Z be considered "undocumented" and therefore not acceptable in a quality controlled environment? |
This feature works fine in 11.0 and 12.0. The documented limitation on BF at 11.0 has been removed at 12.0.
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What kind of damping is available in a Rigid Body Solution in Workbench Simulation? I am particularly interested in material damping. |
In a true Rigid Dynamics analysis, the only type of damping is discrete viscous damping specified for a spring. If you are doing a Flexible Dynamic analysis with rigid bodies, then material... |
In the Workbench Fatigue Module at Release 11.0, how is the safety factor (SF) calculated when mean stress effects are included? |
The safety factor (SF) is calculated is differently depending on the mean stress theory used. The Goodman theory is linear, so the SF is simply the equivalent alternating stress at the specified... |
Why is remote displacament on solid-shell elements giving incorrect reaction forces? The problem disappears when regular 3-D elements are used. |
This is feature request 75615. It is currently a documented limitation of Simulation, as stated below. Some known workarounds are (1) use MPC contact or (2) set... |
In ANSYS Release 11.0, can velocity be obtained from a harmonic analysis? |
Velocity cannot be obtained directly from a harmonic analysis; however, the velocity is simply the displacement multiplied by the circular frequency (omega=2*pi*frequency). Thus, APDL (*GET,... |
I am getting the warning below about a material that is being evaluated outside of the defined temperature range; however, there are no specified temperatures, and both TREF and TUNIF were set to 550 (a temperature at which materials are defined). This warning is issued only if there is a 0 thickness (dropped) layer in the shell element. Is this a bug?
*** WARNING *** CP = 9.594 TIME= 09:53:16
Material property EX of material 1 of element 1 is evaluated at a
temperature of 0, which is below the supplied temperature range.
Temperature range checking terminates. |
This was a code defect (#72923) that has been corrected for version 12.0. The erroneous warning message is no longer issued, and the temperatures are retained.
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Could CFX temperatures be used in an ANSYS acoustic modal for material property evaluation? |
If a temperature-dependent speed of sound (SONC) is specified, the acoustic-modal results would be a function of temperature specified with BF commands. When CFX exports temperatures via a CDB... |
In the Workbench Simulation Fatigue Module at Release 11.0, what is the "Bin Size?" |
The bin size specifies the number of divisions in the rainflow matrix. By default, the bin size is 32, so the rainflow matrix is 32 x 32. A larger bin size has greater precision but will take... |
In ANSYS Release 11.0, is it possible to obtain the contribution of a portion of the model to a particular mode? |
It is not possible to directly obtain the contribution of a portion of a model to a particular mode; however, the ratio of the strain energy for a selected set of elements to the strain energy for... |
I am solving for a scalar variable which should be equivalent to the fluid age by defining a volumetric additional variable Age with units of seconds and then setting it to zero at my inlet with a volumetric source throughout my domain equal to 1.0.
I'd like to convert my range of scalar ages at the exit to something which resembles a standard exit age distribution, but am not sure how to do so.
Is there some way to accomplish this in CFD Post? - KSVIHLA |
The method you use to compute the fluid age is based on the tautology that the substantial derivative of fluid age is 1.0.<br><br>For a constant density fluid, you can convert the... |
In ANSYS Release 11.0, is it possible to access the Micro Electro Mechanical Systems (MEMS) material library from the MEMS Repository from the ANSYS website? |
No. That link is not longer maintained by ANSYS.
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When I run a Cohesive Zone Material Model (CZM) analysis in ANSYS version 11.0SP1, the surfaces remain bonded and fail to separate sine the material table data (TBDATA) assigned to the contact element is material #1. If the material assignment for contact is changed to a number >1, then it runs as expected. Is this a bug? |
This is a limitation that has been trapped at version 12.0 and instructs the user to change the material number to something other than 1.
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Can I do a random-vibration (PSD) analysis in Workbench Simulation on a model supported by body-to-ground spring? I am getting the error message, "This analysis depends on one or more environments that have no fixed support." |
No, a PSD excitation in Workbench Simulation must be applied at a true fixed support. The base excitation is applied with unit displacement constraints at the fixed support. The constraints in a... |
Thermal contact is not allowed in a single-frame restart. How can I work around this limitation? |
MPC-based contact can be used initially, and after a solve (or even PSOLVE,ELFORM), issue CELIST,,,,CONV. This will convert the internal constraint equations created by the contact elements into... |
In ANSYS Release 11.0, are the torsional shear stresses for BEAM188/189 correct? |
No, the SXZ and SXY torsional shear stresses are reversed for BEAM188/189. The value for SXZ is stored as SXY and vice versa. This behavior has been corrected in Release 12.0.
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How can I reduce the moment constraint produced by contact in Workbench Simulation? Moment equilibrium is not being satisfied in my model. |
There is a beta feature called "Beam" formulation in Simulation 11.0 that often produces good moment equilibrium. The contact surfaces are connected by beams and, therefore, produce... |
Why are my COMBI214 elements causing the error below in ANSYS 11.0? They are defined at coincident nodes.
*** ERROR *** SUPPRESSED MESSAGE CP = 3.859 TIME= 18:42:46
Element 74228 (COMBI214) is not in the plane indicated by its
KEYOPT(2). |
This error was a warning at version 10.0. Defect 76339 reported this because the use of coincident nodes for the bearing input is supported. Further investigation may reveal that your nodes are... |
Why does a shell model, supported at the surface, bend the wrong way when subjected to gravity? |
The default SHELL181 applies inertial forces at the nodes without the associated moment. Ignoring rotational inertia could cause hour-glassing with this formulation. Setting KEYOPT(3)=2 corrects... |
In Workbench Simulation Release 11.0, how are pressures and forces applied across multiple entities? |
If a force is applied to multiple scoped entities, the total specified force is evenly applied across all of the entities by converting the force to a pressure with a magnitude equal to the total... |
The APDL command PHYSICS,CLEAR does not remove an RDSF load applied on a surface in version 11.0 SP1 using Windows XP 64 bit. Is this a known bug? |
The was a code defect has been corrected for 12.0 Release.
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