[applekiller]

Hello, everyone.

In programming I want to determine if a cell is on boundary. Is there any way to solve it?

I originally wanted to judge whether the face of the cell was in a boundary patch, but felt that cost too much calculation. I look forward to your thoughts.

[Severus]

Hello,
Check out this thread: Finding boundary cells
Also check out (based on the this answer in the above thread): https://www.openfoam.com/documentati...aryToCell.html

Thanks

[applekiller]

Originally Posted by Severus

Hello,
Check out this thread: Finding boundary cells
Also check out (based on the this answer in the above thread): https://www.openfoam.com/documentati...aryToCell.html

Thanks

Thank you!

Another question is, what is the pattern of grid arrangement in OpenFOAM? Is it that the internal cells are arranged first and then the boundary cells

[Severus]

Hello,
I am not a 100% sure, please correct me if I am wrong. I recommend you to print it out if possible and check for yourself.
For the cells, I think the arrangement is based on axis (at least for structured ones). For a specific x axis value, it is fixed and y and z are numbered for that constant x value. Then x is incremented and the same procedure is followed till all the values of x is reached, by that time you would have covered all the cells (similar to the contant/polyMesh/points file). For the faces however, I have heard that it is first internal and then boundary faces. I think decomposition may also influence this (for parallel simulations where the domain is decomposed into several smaller subdomains).

Thanks