[MaelTY]

I have defined a new LES sub-grid scale model, that are the formulas in the attached picture.

Where n-omega is the unit vorticity vector axis, ci-c is the vector between vertex of a grid element and the center of the grid body, i is the number of vertices of grid elements.

However, I have no idea on how to write UDFs to implement these formulas. Especially the part of how to realize the sub-grid filtering scale. For example, which macro commands are required for this part, the UDF rules, and so on.
It would be grateful if anyone could help me.

Maël Thomas