[Muhammad Asim Sarwar]

Hi all. It is my first thread and I am sorry if I am unable to convey my information properly.

I am new to openfoam and I have started a simulation with heat transfer (chtMultiRegionFoam). My domain is very simple. I have thin rectangular rods with 10mm thickness. The fluid flows inside it.

I am meshing the domain with snappy hex mesh. The problem is that the elements on some fluid domain are perfectly aligned but on some they are distorted (first pic). However, the outer surface of solid domain is perfectly aligned.

The dimension of rod is 200*120mm. On one thread I have read that aspect ratio needs to be close at 1 for snappy hex mesh to work properly. So that's why I have used grading in z direction at both ends so that cell size in x, y and z axis will be same.

fluid.JPG

solid.JPG

blockMesh Dict.txt

SnappyHexMesh Dict.txt