Methods to lower skewness max rate

dhavalpatel1128 · September 17, 2016, 14:24

Hello Everybody,

I am a beginner in ANSYS fluent software. I have learned that in order to have good results from ANSYS, your mesh skewness should be lower than .85. I wanted to know how to lower skewness after adding inflation layers, mesh method and everything? What controls skewness rate? I changed around number of inflation layers, growth rate, etc. and my skewness went up and down, so I want to know exactly what is it dependent on. Thanks

LuckyTran · September 20, 2016, 17:22

It's a meshing problem.

It is an art and you should just play with the meshing parameters to achieve a low skewness. My only advice is to pay attention to the location of skewed cells to see where they are located. If you settings are completely idiotic you can get skewed cells in the core mesh. But usually the skewed cells are located near the edge of the prism layer or inflation layers.

Eliminating skewed cells are extremely important but skewed cells are only a secondary problem. In order to have good results you need to have a mesh with the right mesh parameters. Decide first the cell sizes you need to achieve the targeted result and how many inflation layers, etc. Mesh it, it will likely be skewed, and then compromise and solve the skewness.

September 17, 2016, 14:24	Methods to lower skewness max rate	#1
dhavalpatel1128 New Member Dhaval Patel Join Date: Sep 2016 Posts: 4 Rep Power: 9	Hello Everybody, I am a beginner in ANSYS fluent software. I have learned that in order to have good results from ANSYS, your mesh skewness should be lower than .85. I wanted to know how to lower skewness after adding inflation layers, mesh method and everything? What controls skewness rate? I changed around number of inflation layers, growth rate, etc. and my skewness went up and down, so I want to know exactly what is it dependent on. Thanks

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Cavitation around NACA hydrofoil using interPhaseChangeFoam	Kozan	OpenFOAM Running, Solving & CFD	28	March 11, 2023 23:30
Problem with chtMultiregionFoam radiation boundary condition	baran_foam	OpenFOAM Running, Solving & CFD	10	December 17, 2019 17:36
[snappyHexMesh] Adding layers goes wrong with SnappyHexMesh	Elise	OpenFOAM Meshing & Mesh Conversion	1	April 22, 2013 02:32
same geometry,structured and unstructured mesh,different behaviour.	sharonyue	OpenFOAM Running, Solving & CFD	13	January 2, 2013 22:40
comments on FDM, FEM, FVM, SM, SEM, DSEM, BEM	kenn	Main CFD Forum	2	July 18, 2004 18:28

September 20, 2016, 17:22		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 66	It's a meshing problem. It is an art and you should just play with the meshing parameters to achieve a low skewness. My only advice is to pay attention to the location of skewed cells to see where they are located. If you settings are completely idiotic you can get skewed cells in the core mesh. But usually the skewed cells are located near the edge of the prism layer or inflation layers. Eliminating skewed cells are extremely important but skewed cells are only a secondary problem. In order to have good results you need to have a mesh with the right mesh parameters. Decide first the cell sizes you need to achieve the targeted result and how many inflation layers, etc. Mesh it, it will likely be skewed, and then compromise and solve the skewness.