is there any method give node based velocity BC?

daniel

Dear all: I want to give a velocity inlet boundary condition by using UDF. As I have read, the velocity profile is given by F_Profile macro. So it is based on the face centroid corridnate. When I export the inlet velocity profile, I found the velocity is not as I want at the edge. I think it is because the Fluent software do interpolation process there, Is there any method which can give node-based velocity profile, So we can avoid the shift on edge.

The problem is u=1.5(y^2-2y+1) the velocity u at y=0 and y=1 should be 0. but in fact, when I use the follwing UDF.Afterig 1 step iteration, I export the inlet velocity profile and found the velcoity u is not 0 at y=0 and y=1. {... F_CENTROID(x,f,thread); y=x[1]; F_PROFILE(f,thread,position)=1.5*(y*y-2*y+1); ...}