[babakflame]

Dear Foamers

I want to implement a new type of boundary condition, I have never implemented before. I have a skewed wall that has a 5-degree angle with the real downward coordinate (y in the grid picture). I want to impose a slip velocity condition for the fluid at the wall as a non-linear function of another variable present in zero folder . I think one option is using swak4foam. However, I just have previous experiences using swak4foam for robin boundary condition including normal gradient of the same variable not tangential derivative of another variable. has its own boundary at the wall.

I have attached my grid. the velocity at the converging walls is equal to



In the above derivative, is along the wall. I mean its a tangential derivative


Can some body help me how can I do this?


Regards