Question

how to specify parabolic inlet velocity profile in comsol

Answer 1

I am using COMSOL to model flow through a bioreactor with a parabolic velocity profile at the inlet. In a 2D geometry, for the inlet boundary condition I selected normal inflow velocity and typed 8*Uo*s*(1-s) which worked fine, but in 3D this is not the case.

I have been trying to find out some information on how to do this in a 3D geometry and discovered that surface parameters s1 and s2 exist but I don't know what they represent or how to implement them. Any information on these parameters or any other methods for creating the parabolic profile would be greatly appreciated.