Mesh cells type most suitable for CFD

rv82 · April 6, 2013, 10:43

Hi friends! What is the most suitable and optimal mesh cells type for CFD? I read somewhere that tri-prisms and tet elements are worst for CFD computation. But my case contains that elements, about 20% of all mesh. Is it bad? I can exchange them by hex elements but they will be not orthogonal.

And my second question: what flow directions support tri-prism elements? Can I use these elements as shown on picture?

Thank you!

Roman

jchawner · April 8, 2013, 09:45

The general rule of thumb is that hex cells are superior to tet cells for CFD, especially in high gradient regions like boundary layers and wakes. The exceptions are that the hex cells must be of decent quality (e.g. low skew). Another exception is that a hybrid mesh with prisms in the boundary layer and tets elsewhere can support accurate CFD. You can find many examples of good CFD meshes in any of the reports from the AIAA's Drag Prediction Workshop.

ztdep · April 12, 2013, 09:44

we care the mesh quality. you can use any cell type. Tet, Hex, Prism, wedge, etc.
orthogonal mesh will increase the accuracy, and is more easy to solve.

April 8, 2013, 09:45		#2
jchawner Senior Member John Chawner Join Date: Mar 2009 Location: Fort Worth, Texas, USA Posts: 275 Rep Power: 18	The general rule of thumb is that hex cells are superior to tet cells for CFD, especially in high gradient regions like boundary layers and wakes. The exceptions are that the hex cells must be of decent quality (e.g. low skew). Another exception is that a hybrid mesh with prisms in the boundary layer and tets elsewhere can support accurate CFD. You can find many examples of good CFD meshes in any of the reports from the AIAA's Drag Prediction Workshop. __________________ John Chawner / jrc@pointwise.com / www.pointwise.com Blog: http://blog.pointwise.com/ on Twitter: @jchawner

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
second order schemes	marine	OpenFOAM	67	April 11, 2022 18:19
interFoam/kOmegaSST tank filling with printStackError/Mules	simpomann	OpenFOAM Running, Solving & CFD	3	February 17, 2014 17:06
[snappyHexMesh] Layers:problem with curvature	giulio.topazio	OpenFOAM Meshing & Mesh Conversion	10	August 22, 2012 09:03
killed "snappyHexMesh"	parkh32	OpenFOAM Pre-Processing	2	April 8, 2012 17:12
[snappyHexMesh] snappyHexMesh aborting	Tobi	OpenFOAM Meshing & Mesh Conversion	0	November 10, 2010 03:23

April 12, 2013, 09:44		#3
ztdep Senior Member p ding Join Date: Mar 2009 Posts: 427 Rep Power: 19	we care the mesh quality. you can use any cell type. Tet, Hex, Prism, wedge, etc. orthogonal mesh will increase the accuracy, and is more easy to solve.