how to make good Mesh

niaz · June 22, 2012, 15:50

Dear CFD man
My question is " what feature does a good mesh have?"
how can we check that is a mesh good or not?

bi.bi · June 24, 2012, 12:37

it depends on your problem. i.e. we can use multi-grid for some problem or not. although we must notice to time scale and space scale ... . finally it's refer on your experience about problems.

sepidecent · June 24, 2012, 20:56

Hi

I have a rectangular box,(450*900*225mm) and a slot (extrude with imprint faces) at the top of the box (450*225mm) that is 10mm at the middle of the box so the centrelin eof the box is at 225mm in x direction.I used multizone mesh with different mesh sizes of 8,7,6,..3mm but in all cases when I look at my data in post CFX,the slot size has been moved about 4mm from the centreline,and I think the problem is with multizone mesh method I can compensate for half elements or any decimal number of elements,scince I need an exact value of variables in CFX post this movment make my results antisymmetric.
I would appreaciate if anybosy knows how to make the mesh process better.

Regards,
Sepi

June 22, 2012, 15:50	how to make good Mesh	#1
niaz Senior Member A_R Join Date: Jun 2009 Posts: 122 Rep Power: 16	Dear CFD man My question is " what feature does a good mesh have?" how can we check that is a mesh good or not?

June 24, 2012, 12:37		#2
bi.bi New Member Join Date: Jun 2012 Posts: 2 Rep Power: 0	it depends on your problem. i.e. we can use multi-grid for some problem or not. although we must notice to time scale and space scale ... . finally it's refer on your experience about problems. Last edited by bi.bi; June 24, 2012 at 13:22.

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June 24, 2012, 20:56		#3
sepidecent New Member sepideh Join Date: Jul 2011 Posts: 21 Rep Power: 14	Hi I have a rectangular box,(450900225mm) and a slot (extrude with imprint faces) at the top of the box (450*225mm) that is 10mm at the middle of the box so the centrelin eof the box is at 225mm in x direction.I used multizone mesh with different mesh sizes of 8,7,6,..3mm but in all cases when I look at my data in post CFX,the slot size has been moved about 4mm from the centreline,and I think the problem is with multizone mesh method I can compensate for half elements or any decimal number of elements,scince I need an exact value of variables in CFX post this movment make my results antisymmetric. I would appreaciate if anybosy knows how to make the mesh process better. Regards, Sepi