[Jackie Chen]

Hi Foamers

I wanna investigate the flow near the wall. If i have a domain in rectangular shape. How can I do the local mesh refinement at the wall? and How can the inlet have log velocity profile?
Thanks

[norkistar]

You can use refineWallLayer to refine the mesh near the wall. See http://openfoamwiki.net/index.php/RefineWallLayer

[Jackie Chen]

Originally Posted by norkistar

You can use refineWallLayer to refine the mesh near the wall. See http://openfoamwiki.net/index.php/RefineWallLayer

Hi Norkistar

Thanks for your sharing. Can you explain in depth hwo to excecute the refineWallLayer utilities?

[norkistar]

refineWallLayer patchname edgeweight for example you want refine layer at the wall patch then you can type refineWallLayer -overwrite wall 0.1

[Jackie Chen]

Bin Xu

Thanks for your kind help. Normally this is done after meshing?

[norkistar]

After using blockMesh, then refine it at the patch that you want

[Jackie Chen]

Hi

Thanks. Have you ever tried "applyBoundaryLayer"?

[Jackie Chen]

Originally Posted by norkistar

refineWallLayer patchname edgeweight for example you want refine layer at the wall patch then you can type refineWallLayer -overwrite wall 0.1

When i type refineWallLayer -overwrite wall 0.1 it doesnt work. only i type refineWallLayer wall 0.1 it works. is the "overwrite' compusory?

[norkistar]

-overwrite is to overwrite the original mesh in the constant/polyMesh file. Please read the http://openfoamwiki.net/index.php/RefineWallLayer it specifies clearly

[Ahmed Khattab]

Originally Posted by Jackie Chen

Hi Foamers

I wanna investigate the flow near the wall. If i have a domain in rectangular shape. How can I do the local mesh refinement at the wall? and How can the inlet have log velocity profile?
Thanks

you can also divide your mesh into two meshes one near of wall with fine meshing and one away from wall with coarser mesh.

also, you can change cells length near wall and away from it by adjusting fraction of cell length in blockMeshDict

Hex (0 1 2 3 4 5 6 7) (20 20 20) simpleGrading (1 1 1)

changing values in red colour.