[researcher]

How do we find whether a cell is located at the wall. How would the algorithm do it ?

Thanks in advance


shah

[mprinkey]

Originally Posted by researcher

How do we find whether a cell is located at the wall. How would the algorithm do it ?

Thanks in advance

shah

If you are talking about an unstructured code like FLUENT or OpenFOAM, to touch all of the cells adjointing a wall boundary, you loop over the faces in the wall thread/patch and look up the cell connected to each face (F_C0() in FLUENT, etc).

[researcher]

Thank you for your reply.
In fact I am programing it using fortran. Plus I am using unstructured mesh. I am curious how would a triangular cell with only one of its vertices located on the wall effect the algorithm.
Thanks

[mprinkey]

Originally Posted by researcher

How do we find whether a cell is located at the wall. How would the algorithm do it ?

Thanks in advance


shah

Originally Posted by researcher

Thank you for your reply.
In fact I am programing it using fortran. Plus I am using unstructured mesh. I am curious how would a triangular cell with only one of its vertices located on the wall effect the algorithm.
Thanks

It won't. If you are using FVM, the entire scheme is based on surface integrals over each cell. A single vertex has no area to integrate over, so its contribution is zero. Only finite area faces will contribute to the flux balances that you write for each cell.

[researcher]

Originally Posted by mprinkey

It won't. If you are using FVM, the entire scheme is based on surface integrals over each cell. A single vertex has no area to integrate over, so its contribution is zero. Only finite area faces will contribute to the flux balances that you write for each cell.

Haha, of course. Thank you. Your reply made both my work and the day.