Trouble in implementing Boundary condition in OF
 

Dear Foamers,

I was trying to implement the following boundary condition on a wall.

du/dy = B*dA/dx where A is obtained by solving another pde.

I can understand how to implement the boundary condition for the following case.

du/dy = B*dA/dy

However, I do not understand the former case. Let me know your suggestions.

Thanks

Vishal