Meshing

bisht044 · June 8, 2017, 04:31

Can anybody tell me pls what change there will be if meshing hexahedral is not in my setup ..than how will differ the result tetrahedral ....what is basic diiference in calculation n all in case of numerical investigation of natural convection heat transfer over annular finn case is taken for numerical investigation...thank you all suggestions wellcome

BlnPhoenix · June 8, 2017, 09:20

I'm not sure how well tetra results compare in general to hexaeder results. I can imagine results can be identical. What i know is that you will need a lot more cells and therefore more computational time to get to (same) results as the hexaeder solution.

Also for multiphase analysis it is always better to have hexaeder mesh, because the interphase is captured more realistic.

LuckyTran · June 11, 2017, 15:09

On a tetrahedral grid, the calculation of gradients is tough and this gradient is needed for everything in FVM.

One would hope that tets vs hex's are the same, but that simply isn't true from a practical standpoint.

June 8, 2017, 04:31	Meshing	#1
bisht044 New Member yoman Join Date: Jun 2017 Posts: 1 Rep Power: 0	Can anybody tell me pls what change there will be if meshing hexahedral is not in my setup ..than how will differ the result tetrahedral ....what is basic diiference in calculation n all in case of numerical investigation of natural convection heat transfer over annular finn case is taken for numerical investigation...thank you all suggestions wellcome

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June 8, 2017, 09:20		#2
BlnPhoenix Senior Member Join Date: Aug 2014 Location: Germany Posts: 292 Rep Power: 13	I'm not sure how well tetra results compare in general to hexaeder results. I can imagine results can be identical. What i know is that you will need a lot more cells and therefore more computational time to get to (same) results as the hexaeder solution. Also for multiphase analysis it is always better to have hexaeder mesh, because the interphase is captured more realistic.

June 11, 2017, 15:09		#3
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,675 Rep Power: 66	On a tetrahedral grid, the calculation of gradients is tough and this gradient is needed for everything in FVM. One would hope that tets vs hex's are the same, but that simply isn't true from a practical standpoint.