Q. Where is part proximity meshing control or its equivalent in version 11
A. This is always on at 11.0 and has been removed as an (ON/OFF) Options |
Q. Where is part proximity meshing control or its equivalent in version 11<br><br>A. This is always on at 11.0 and has been removed as an (ON/OFF) Options
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SYMPTOM:
For a moving mesh problem, If the user specifies 5 coefficient loops per time step for the mesh displacement equation, only one coefficient loop is taken into account.
PROBLEM:
For moving mesh problem, the solver recognizes the global default setting instead of the specified setting in the mesh displacement equation class. |
WORKAROUND:<br>No workaround is currently available.<br><br>FIXED IN:<br>ANSYS CFX Release 11.0 Update 1.
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Class 3 Error
SYMPTOM:
The density of Iso-Octane C8H8 is 253.35 kg m^-3 in the CFX-11 material library " Liquid Phase Combustion".
PROBLEM:
Wrong value of the density. This latter should be in the range of 600 - 800 kg m^-3 for a reference point of about 300K, according to NIST We |
WORKAROUND:<br>No workaround is currently available.<br><br>FIXED IN:<br>ANSYS CFX Release 11.0 Service Pack 1.
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What kind of CFX 11.0 modules can be used with a multiphysics license (ane3fl)? |
You can run CFX-Pre, basic CFX Solver, and CFX-Post. Each module will check out one ane3fl. Also you can launch Simulation, then right click Mesh>Edit in CFX-Mesh from the display tree to... |
In the equation of motion for a particle, Equation 4 in ANSYS CFX-Solver Theory Guide | Particle Transport Theory of the CFX 11.0 documentation, the Left Hand Side (LHS) represents the time rate of change of the particle momentum, the Right Hand Side (RHS) represents the relevant forces modeled. For an evaporating particle, is a (dm/dt)*v term added to the LHS? Does a corresponding source term for the particle mass transfer appear in the continuous phase momentum equation? |
In the equation for the particle velocity, the LHS of the momentum equation can be written as d(m*v)/dt; however, there is an extra term v*d(m)/dt that should be added to the RHS (the rate of loss... |
1-2 points will give you a 3D density object depending on size and width. The element size within that object will be of designated size. It will expand away from the object using the ratio.
For 3 or more points, it will first expand away from the object using width and size, then away from these layers using the ratio. This is true whether the object is planar or makes up a polyhedral. For polyhedral objects, it doesn't make sense to prescribe a width - the designated size will be inside the polyhedra. If you set width, then you also get that prescribed size so many layers outside the polyhedra. |
1-2 points will give you a 3D density object depending on size and width. The element size within that object will be of designated size. It will expand away from the object using the... |
How do I turn ghosting off in ANSYS Version 11.0, 32 or 64-bit?
Executing "sdbinst.sdb" in v10.0 turns off ghosting, but this file doesn't seem to get installed when installing version 11.0. |
The ansys110.sdb file attached should turn off ghosting.<br>Correctly install this file with the following command:<br><br>sdbinst "C:Program FilesANSYS... |
Customer tries to run Workbench and receives the following error:
Driver Component sizes mis-match. Retry to keep going. Cancel to exit
Then the following error:
Script Error:
Line: 41621
Char: 1
Error:
Code: 80004005
Source:
Script if(ds.Graphics.CameraMode == id_DefineCutPlane)
What causes this error? |
This was due to an old Graphics Card/Monitor combination. After replacing with newer components, Workbench ran as expected.
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QUESTION:
At ANSYS v11 and earlier, it appears that LDREAD,EHFLU does not read surface heat fluxes from HF emag (HF119/120) as surface loads in a thermal analysis. Is there a workaround?
ANSWER:
The problem appears to exist only when the emag and thermal elements exist on the same side of the surface to which shield conditions were applied in the HF emag model using SFx with the SHLD label. The APDL workaround (see ehflu.mac) used in the model attached to this solution appears to work fine.
Additional background that may be useful:
1) SFLOSS (ETABLE item NMISC,8) is the total surface loss (in Watts for all surfaces experiencing surface loss) for the HF119/120 element.
2) ETABLE item NMISC,9 is the lowest face number flagged with SHLD condition for which nonzero surface loss is calculated.
3) ETABLE item NMISC,10 is the surface heat flux (in W/m^2) on the face number identified by ETABLE item NMISC,9.
4) ETABLE items NMISC,11 and 12 are next highest flagged face number and corresponding surface heat flux in W/m^2.
5) ETABLE items NMISC,13 and 14 are next highest flagged face number and corresponding surface heat flux in W/m^2 after the NMISC,11 face number.
6)Supposean element has only one face with the SHLD flag. If you divide SFLOSS (NMISC,8) by area of the flagged face identified by NMISC,9, you'll get the surface heat flux reported as NMISC,10. I checked this at v11.
7) The attached test model and macro seem to work (total solve time ~2 minutes). The macro writes a command file defining heat fluxes that can be subsequently read into a thermal model when LDREAD,EHFLU does not read in the values (which seems to happen only when HF emag and thermal elements appear on the same side of the boundary flagged with SHLD).
8) I haven't yet checked the MFS for this modeling scenario. If I determine that surface heating is not transferred using MFS, then, until the code is enhanced to account for this case, user |
QUESTION:<br>At ANSYS v11 and earlier, it appears that LDREAD,EHFLU does not read surface heat fluxes from HF emag (HF119/120) as surface loads in a thermal analysis. Is there a... |
SYMPTOM:
Non-MeTiS methods (eg, user-specified direction) can give poor partitions on structured grids, if the distance of an entire plane of nodes is the same in the specified direction. The partition boundary can be jagged, switching back and forth between two planes. This can lead to excessive overlap and possible robustness problems (particularly with free surface flow).
PROBLEM:
This is due to this potential problem not being thought of during design. |
WORKAROUND:<br>There is no workaround.<br><br>FIXED IN:<br>ANSYS CFX Release 11.0 Update 1.
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How to use a PERL script to write out the percentage of bad elements (below the limit value, "% Bad") of a give mesh quality metrics in ANSYS TurboGrid batch mode. |
The mesh statistics are stored in a CCL object which you can access through perl script using the instructions provided below:<br><br>The way to do this in a PERL script envirnoment is... |
Why do I receive the following error message when installing ANSYS Pressure Equipment Module 11.02?
Error 1315.A network error occurred while attempting to read from the file
C:Docume~1jvwLocals~1Temp_is48BANSYS Pressure Equipment Module 11.01.msi.
OK |
If you have installed the ANSYS Pressure Equipment Module 11.01 you will need to uninstall it.<br><br>Two ways to do that:<br>1)Run the setup file that has been used to install... |
When I run the RSM 11.0 "Test Server", I receive the following error. Why?
ANSYS.Scripting.Process.FatalCommandException:rcp::not a plain fileServer stack trace: at ScriptDevelop.RPCCommand.apr_OnReceivedStdErrMess
The previous command failed to complete successfully: retrying in 10 seconds |
Based on the "ls" output of RSM log, his "ls" output does not conform to the POSIX locale.<br><br>The environment variable LANG is overriding the default... |
What are the Windows 64-bit parallelization limitations? |
<br><br>(1) With PVM, a 64 bit Windows machine cannot act as a SLAVE. This is a known problem. It can act as a MASTER though. Should be fixed in SP1.<br>(2)With MPICH, a 64 bit... |
How can you set the thermal conductivity in a porous domain in CFX 11.0? |
<br><br>There is no energy equation for the solid phase when porous domain is defined. The only way to simulate the energy transfer between the solid and the fluid phase of the porous... |
How can I identify the action point for forces on a surface in CFX-11.0? |
<br><br>This can be done in CFX-Post, but not automatically. In the CFX-Post calculator you have to calculate the following expression for 2D space:<br><br> x_p = (area y... |
What is an optimal choice for the model parameters of a non-reflective boundary ? |
A perfectly nonreflecting boundary condition sets the amplitude of incoming characteristic waves to zero. Unfortunately, this kind of condition is not robust, so instead the wave amplitude is... |
CAD-NEXUS Interface for CATIA can import .Catpart but not .CatProduct files. What is the problem? |
.CATProduct files are actually assemblies, all the parts of the assembly must exist in the same directory.
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I import a BladeGen file into DesignModeler (DM) and try to create a fillet at the base of each blade. The model is a 360 runner. Some of the fillets are created properly, but at least half of them are imcomplete and there appears to be a hole at the base of the blade where the fillet should have been created. This is confirmed by importing the resulting model into ICEM. |
Sometimes fillet creation can fail when the fillet is created from several curves rather than one. If the hub surfaces appears as several sub surfaces in DM, the curve around the base of each... |
Which version of ANSYS will work with Windows Vista? |
No version of ANSYS up to 11.0 is not supported on Windows Vista.<br>We are currently looking to certify ANSYS 11.0 SP1 or 12.0 on Windows Vista. This still has not been formalized.
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I have a BladeModeler License, however, when I start Design Modeler 11.0, there is no BladeEditor icon. What is the problem? |
There are a few things to check:<br><br>1) Ensure under Tools > Addins... that the "Load on Startup" and "Loaded" checkboxes are checked under... |
In some circumstances, a thin surface (internal wall), meshed in ICEM and imported into CFX-Pre have a strange appearance. Some of the surface mesh is visible where it shouldn't be. The attached PNG file shows an example of this, with the surface mesh being visible in the central region. |
<br>CFX requires a separate mesh on each side of the thin surface, which ICEM provides automatically when the mesh file is written. In ICEM, the meshes on each side match node for node, but... |
Class 3 Error
SYMPTOM:
A case using the Redlich Kwong equation of state may have inaccuracies in phase change predictions, and give differents results to Release 10.0.
PROBLEM:
Various liquid phase saturation properties are being set to values predicted by the raw Redlich Kwong equation of state instead using the more accurate equations or correlations listed in the documentation. The list of inaccurate properties is:
- density (should use the Rackett equation)
- enthalpy (should be offset from the gas value by the latent heat correlation mentioned in the documentation)
- specific heat capacity at constant pressure (should use the the Cp correlation presented in the documentation)
- specific heat capacity at constant volume (should use the Cp correlation presented in the documentation)
- entropy (should be offset from the gas value by -(latent heat)/Tsat(p))
The inaccurate predictions of the raw Redlich Kwong equation of state for liquid phase properties will mainly lead to inaccuracies in phase change predictions when running the equilibrium wetness model (equilibrium phase change) or the thermal phase change model (non-equilibrium |
WORKAROUND:<br>For steam calculations, a workaround is to use the IAPWS equation of state instead. There is no workaroundcurrently available for other materials.<br><br>FIXED... |
How much computer memory is required to produce a mesh of a given number of elements? |
This is a difficult question to answer accurately but some general guidelines can be provided.<br>Note that, due to the underlying meshing techniques employed, memory use for the final mesh... |
Class 3 Error
SYMPTOM:
Some values do not change when the timestep is changed in CFX-Post, even though they should do so.
PROBLEM:
Components of vector variables are not updated properly when the timestep is changed. For example, the expression "massFlowAve(Velocity u)@inflow" will not be updated as it involves a component |
WORKAROUND:<br>There is no workaround.<br><br>FIXED IN:<br>ANSYS CFX Release 11.0 Update 1.
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