get the velocity of previous and next cells

[Kevin]

Hi guys. I wanna get the velocity of the previous and next cells and multiply them e.g:


is it possible in this code? thanks

[Yvan Fournier]

Hello,

What do you consider "previous" and "next" cell in an unstructured mesh ?

For a 1-d mesh, you can use the mesh->i_face_cells (face -> cells adjacency array, see in Doxygen documentation) can help you access the adjacent cells. For more complex cases, tou can also access those cell's centers (in cs_glob_mesh_quantities->cell_cen) for additional tests/filtering.

Best regards,

Yvan

[Kevin]

Thanks admin.
My grid is structured then hence the solver is unstructured you mean i have to get the values of left hand side -. right hand side by the coordinates of the cell and the distance between centers? That will be reallly time consuming and inaccurate

[Yvan Fournier]

Hello,

You do not need the coordinates if the neighboring cells are sufficient. But they may help for example when you have 6 neighbors (in 3D) and need to know which is which. Because even if you grid is initially structured, it is internally handled as an unstructured grid.

Best regards,

Yvan