Porous jump for curved surface formulation would be same as of planar surface. Important point to consider is that when you are computing face permeability and pressure jump coefficient in Darcy’s law the velocity used is normal velocity to the surface. Fluent User’s Guide V17.2 : 6.3.20 Porous Jump Boundary Conditions, Equation (6-128) During computation pressure drop will be computed across the surface in normal direction and then components will be implemented in three momentum equation.