Element quality

December 6, 2006, 08:59

Hello, I have a more general question concerning the mesh generation. However since I am using CFX I will post it here.

I know that it is important to generate elements with a "quality" as high as possible (e.g. for CFX at least 0.15, if possible). I also know that "high quality" means that the angles of the elements are supposed to be as good, i.e. as similar as possible (Prism 90deg, Tetra 60deg, etc), right?

What I do not understand is simply the reason. If I am using a CV-approach (like in CFX) my equations will be "made out of" expressions including CV-face-points. But why is it important to have faces that are oriented towards each other as similar as possible?

Regards Andreas

December 6, 2006, 10:07

Avoiding excessive numerical diffusion amongst other things.

December 7, 2006, 10:14

Alright, thank you.But what role play the element angles for numerical diffusion? If the answer is too lenghty for this forum I would be very pleased to get the titles of some good textbooks/references that deal with the issues of control volumes and element quality.

Thanks and regards Andreas

December 6, 2006, 08:59	Element quality	#1
Andreas Guest Posts: n/a	Hello, I have a more general question concerning the mesh generation. However since I am using CFX I will post it here. I know that it is important to generate elements with a "quality" as high as possible (e.g. for CFX at least 0.15, if possible). I also know that "high quality" means that the angles of the elements are supposed to be as good, i.e. as similar as possible (Prism 90deg, Tetra 60deg, etc), right? What I do not understand is simply the reason. If I am using a CV-approach (like in CFX) my equations will be "made out of" expressions including CV-face-points. But why is it important to have faces that are oriented towards each other as similar as possible? Regards Andreas

December 6, 2006, 10:07	Re: Element quality	#2
Joe Guest Posts: n/a	Avoiding excessive numerical diffusion amongst other things.

December 7, 2006, 10:14	Re: Element quality	#3
Andreas Guest Posts: n/a	Alright, thank you.But what role play the element angles for numerical diffusion? If the answer is too lenghty for this forum I would be very pleased to get the titles of some good textbooks/references that deal with the issues of control volumes and element quality. Thanks and regards Andreas

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