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June 22, 2008, 14:27 |
Are Pyramid elements good for CFX solver
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#1 |
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Hello friends,
Can anyone explain me in the following doubt Case: I am having a volume mesh on a geometry like a waterjacker for SI engine. I plan to create a hybrid mesh ( tet+ prism layers) In some places of my mesh ,I get pyramids . So my question is are pyramids here are an unwanted elements or I should still go ahead with such mesh or sit n redo the mesh till I get rid of pyramids Thanks for your inputs |
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June 22, 2008, 18:37 |
Re: Are Pyramid elements good for CFX solver
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#2 |
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Hi,
CFX works with pyramid shaped elements. This is discussed in the documentation. Glenn Horrocks |
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June 24, 2008, 02:14 |
Re: Are Pyramid elements good for CFX solver
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#3 |
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What documentation are your refering sir. Kindly give me reference number of the same.
thanks Best Regards |
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June 24, 2008, 02:23 |
Re: Are Pyramid elements good for CFX solver
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#4 |
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Also I would like to know, that when you have hybrid mesh like tet with prism layers ,then pyramids are unwanted element as we dont actually specify for such element anywhere . Specially when I get pyramids in the area of interest.
Keeping pyrmaids is good for CFD reesults in general or not.Kindly clearify the above Thank you Sir for your feedback Best Regards |
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June 24, 2008, 20:41 |
Re: Are Pyramid elements good for CFX solver
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#5 |
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Hi,
Element shapes is discussed in the CFX documentation which by default is included with a CFX installation. ICEM/CAD2MESH occasionally generates pyramid elements in heavily distorted regions of the mesh at the tet/prism boundary. While good quality pyramids are fine for the solver often the pyramids generated this way are of very bad quality and should be minimised. Glenn Horrocks |
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June 25, 2008, 13:52 |
Re: Are Pyramid elements good for CFX solver
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#6 |
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Pyramids are necessary if the number of adjacent inflation layers changes, exposing a quad face at the side of a prism. The pyramid element connects the quad face to adjacent tetrahedral elements. You can reduce the number of pyramid elements by refining the surface mesh in the region where they are created and/or modifying your inflation settings. That said, CFX has no issues with pyramids, so it isn't necessarily worth the extra effort or additional mesh, unless you have other mesh quality issues in this region.
-CycLone |
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June 26, 2008, 02:27 |
Re: Are Pyramid elements good for CFX solver
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#7 |
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Thanks a lot people to have really cleared my doubts on pyramids elements.
Best Regards Pratik Mehta |
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