Structured (Cutcell) vs Unstructured (tetrahedral) meshes difference in Fluent result

Stan_Mech · August 16, 2016, 13:44

Hello Guys,

I am trying to investigate the difference in the results if I use structured (cutcell) mesh vs unstructured (tetrahedral) mesh in fluent. I am simulating hot airflow (60 m/s at 900 K) passing through a catalytic converter, and in cases that I compared using k-omega turbulence model the cutcell mesh produced double the TKE than the tetrahedral mesh in the flow expansion and contraction areas in the geometry.

Anyone has ever compared two types of meshing techniques and would like to give any input?

Thanks,
Mike

DRiver · August 20, 2016, 21:30

Hi Mike. I have done this type of comparison, I have got similar results. If you're sure you're using the same initial conditions, you must try to do a mesh independent analysis for each method. You can only compare your results when you get converged values. If you already did it, please tell us.

August 16, 2016, 13:44	Structured (Cutcell) vs Unstructured (tetrahedral) meshes difference in Fluent result	#1
Stan_Mech New Member Join Date: Mar 2012 Posts: 4 Rep Power: 14	Hello Guys, I am trying to investigate the difference in the results if I use structured (cutcell) mesh vs unstructured (tetrahedral) mesh in fluent. I am simulating hot airflow (60 m/s at 900 K) passing through a catalytic converter, and in cases that I compared using k-omega turbulence model the cutcell mesh produced double the TKE than the tetrahedral mesh in the flow expansion and contraction areas in the geometry. Anyone has ever compared two types of meshing techniques and would like to give any input? Thanks, Mike

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How cell skew affects solution in structured vs unstructured grids	lordvon	Main CFD Forum	1	July 3, 2013 07:19
Different result in CFX and fluent for mass trans.? is segregated better?	ftab	CFX	7	September 27, 2012 08:57
Difference between structured & unstructured mesh	Andrew	Main CFD Forum	2	February 20, 2003 09:40
Large 3D tetrahedral meshes	Aldo Bonfiglioli	Main CFD Forum	4	August 27, 1999 04:33
Unstructured CFD code; Difference ??	J Roued	Main CFD Forum	2	May 13, 1999 14:03

August 20, 2016, 21:30		#2
DRiver New Member Daniel Riveros Join Date: Nov 2015 Location: Genoa, Italy Posts: 14 Rep Power: 11	Hi Mike. I have done this type of comparison, I have got similar results. If you're sure you're using the same initial conditions, you must try to do a mesh independent analysis for each method. You can only compare your results when you get converged values. If you already did it, please tell us.