blockMesh-grading &cell expansion ratios
 

Dear openFoam Users,

please help me with this simple problem.

I would like to mesh a rectangular area using blockMesh with a grading function to manipulate the cell expansion ratio. This function would tighten the mesh dimensions near the domain boundary.The cell expansion ratio would need to be governed by a sinusoidal function.

In the example below we can read "simpleGrading" and I would like to have other solutions available.

Please explain me how this can be done or point me to similar threads in the forum.

PS:
I am a begginer, please mind that if you loose the time to help me:).

Regards,
Luis

"
blocks
(
hex (0 1 2 3 4 5 6 7) // vertex numbers
(10 10 10) // numbers of cells in each direction
simpleGrading (1 2 3) // cell expansion ratios
);
"

I am also a beginner, but I saw here that there is an other function for grading:
edgeGrading

It deliver the possibility to grade toward each edge instead of only the directions, but I think you want something more. Hope however it helps.

blockMesh is a very simple tool, I doubt you can use it for this. Either you use a more sophisticated mesher like Pointwise or ICEM or such, or you need to write some code for blockMesh.

Thanks for taking the time to help me.

Your intuition is correct. The option edgeGrading is not what exactly what I need.

Regards,
Luis

Thanks for taking the time to help me.

I also feel that I have to write some code for blockMesh. Can you help me with this and/or point me in the right direction?

Regards,
Luis

Hey Luis Batista,

those guys were also not satisfied with the grading OF provides:

http://www.cfd-online.com/Forums/ope...e-grading.html

I'm not sure if it is exactly what you are looking for
however it eventually gives you a starting point
for own adjustments to the grading tools.

I hope I could contribute
regards

Hello,

It seems that you hit the spot!

I am going to investigate this thread further and come back with an answer and hopefully share my findings.

Thanks for your support,
Luis