Standard wall function vs Two layer model

C. ORTEGA

Hello

I've been using the standard wall function and two layer model to represent the boundary layer for the turbulent flow across a set of obstacles that represent an idealised filter. I have followed FLUENT guidelines to create grids for each approach. When I use the standard wall function I get pressure drops that are 50-60% larger than the value I get in the laboratory. The use of the two layer model matches perfectly the experimental values. That is for when I model the problem as a 2D analysis. When I model the problem as a 3D analysis. The use of the standard wall function and the two layer model does not make any difference giving both approches the same value I get in the lab.

Any comments would be very appreciated.

Thank you