Solution on hexa mesh vs solution on tetra mesh

Chander · December 8, 2011, 17:55

Hi,

I have a block structured hexa mesh (made in ICEM CFD) for my geometry and a converged solution for fluid flow and conjugate heat transfer on this mesh (solved in CFX).

I have not used tetra mesh with prism layers before for fluid flow. I now want mesh the same geometry with the automated tetra + prism layer mesh in ICEM CFD and solve the same problem as above for this mesh and then compare the results with those on the block structured hexa mesh.

How should I ensure that any difference in results that I finally get is only due to change in nature of mesh from hexa to tetra and not other factors like mesh density etc.?

Thanks for your inputs

ghorrocks · December 9, 2011, 04:22

Do a mesh sensitivity study of both meshing options separately. You can only compare fully mesh independent meshes of each type to get a meaningful result.

Chander · December 10, 2011, 09:35

Thanks Glen for your reply. Yes, that makes sense. I will do grid independence studies on both types pf meshes as per your suggestion before comparing the results.

Best regards.

December 8, 2011, 17:55	Solution on hexa mesh vs solution on tetra mesh	#1
Chander Senior Member Join Date: Oct 2010 Location: Zurich Posts: 176 Rep Power: 16	Hi, I have a block structured hexa mesh (made in ICEM CFD) for my geometry and a converged solution for fluid flow and conjugate heat transfer on this mesh (solved in CFX). I have not used tetra mesh with prism layers before for fluid flow. I now want mesh the same geometry with the automated tetra + prism layer mesh in ICEM CFD and solve the same problem as above for this mesh and then compare the results with those on the block structured hexa mesh. How should I ensure that any difference in results that I finally get is only due to change in nature of mesh from hexa to tetra and not other factors like mesh density etc.? Thanks for your inputs

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December 9, 2011, 04:22		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,937 Rep Power: 145	Do a mesh sensitivity study of both meshing options separately. You can only compare fully mesh independent meshes of each type to get a meaningful result.

December 10, 2011, 09:35		#3
Chander Senior Member Join Date: Oct 2010 Location: Zurich Posts: 176 Rep Power: 16	Thanks Glen for your reply. Yes, that makes sense. I will do grid independence studies on both types pf meshes as per your suggestion before comparing the results. Best regards.