It looks like the perforated plate has holes through the plate at an angle to the surface of the plate to introduce the coolant with an inlet velocity vector at that specific angle.nSince the perforated plate is specified as adiabatic, with a fixed temperature wall boundary condition, you don't need to consider heat flow in the plate. Therefore the plate is just a wall surface with holes in it. Given that the holes have a circular cross-section, the edge of the hole on the plate surface is an ellipse.nDraw elliptical faces on the bottom wall of you primary flow domain. Set the bottom wall to have the plate temperature Taw as a part of the wall boundary condition. Create an Inlet boundary condition on each elliptical face to have the coolant fluid flow in at a temperature of Tc with a velocity Vc at the correct vector angle.nThat approach has a simplifying assumption, which is that the inlet velocity is uniform on the whole area of the ellipse. In fact, there is probably a profile due to the coolant having developed a boundary layer along the length of that hole.nn