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March 3, 2012, 23:21 |
mesh skewness
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#1 |
Member
Musango Lungu
Join Date: Dec 2011
Location: China
Posts: 73
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I am running a 2D gas-solid fluidized bed reactor simulation in fluent. The grid was created in gambit. my simulation breaks down after some time with the message divergence detected in AMG solver. I have searched many forums and people recommend that i check the quality of the mesh. Having done so the min and max skewness of my mesh is 1.305729e-10. can somebody advice me if this is good enough! what is the criteria for mesh skewness
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March 5, 2012, 01:38 |
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#2 | |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
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Quote:
do it once again: in Gambit go in examine mesh and click on "worst element". And check the value of the skewness. http://my.fit.edu/itresources/manual...equiangle_skew
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March 7, 2012, 06:27 |
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#3 |
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Musango Lungu
Join Date: Dec 2011
Location: China
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Thank you max! I checked it and it is 0.1306 i.e in the range between 0 and 2.5 meaning it is excellent but I can not still understand why i am getting the reverse flow problem. I have reduced my under relaxation factors as well!
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March 7, 2012, 08:52 |
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#4 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
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reverse flow may occures at the start of computation, but should disappear (no link with skewness).
else you may extend your outlet domain, it is closed to an obstacle
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In memory of my friend Hervé: CFD engineer & freerider |
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June 7, 2012, 08:21 |
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#5 |
New Member
ARUN V
Join Date: May 2012
Posts: 13
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Hi...
I am a beginner in ANSYS FLUENT 13.0, so please excuse me to answer this simple question " how to check the skew ness and other parameters(other than sizing,inflation,statitics etc which are visible when mesh is highlighted) of the mesh? Thank you in advance... |
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June 7, 2012, 09:32 |
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#6 |
New Member
Join Date: May 2012
Location: Moscow
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In Ansys Meshing after you generate mesh in the Details choose 'Statistics' (click the + icon to unfold it). There you can see number of elements and nodes. And in the 'Mesh Metric' you can choose different kinds of mesh properties including Skewness and Orthogonal Quality.
In FLUENT when the mesh is loaded you can click 'Check' in the General tab and 'Report Quality' to check the orthogonal quality and aspect ratio properties. Sizing and inflation options are also visible in the 'Details of Mesh' when you simply click 'Mesh' in the Outline tree in Ansys Meshing. If you have any locally applied inflation, then it appears under 'Mesh' in the outline tree, and after clicking desired inflation there you will also see its properties in the 'Details'. |
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June 7, 2012, 10:56 |
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#7 | |
New Member
ARUN V
Join Date: May 2012
Posts: 13
Rep Power: 13 |
Quote:
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July 21, 2012, 14:03 |
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#8 | |
New Member
ARUN V
Join Date: May 2012
Posts: 13
Rep Power: 13 |
Quote:
How do we remove these worst element??(ANSYS V14) I find some highly skewed cells near some simple surfaces(maximum skewness :0.999999) suggestions will be helpfull.. . Thanks in advance |
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