Hi,

I'm modelling a solar car in a wind tunnel in fluent and I'd like to know how I can create a surface roughness for one of the walls(ie. the bottom wall of the wind tunnel to simulate the road surface).

If you use any turbulence model, you will see in the boundary condition panel a line with "wall roughness"...fill it.

when clicking Solution-Solve-Initialise-compute from what is the best value of compute from to select, for instance in a wind tunnel model the options are: all-zones, car, velocity inlet, wall. Which would be the best for me to select in this case?

thanks sandile

hi initialize from the velocity inlet. It seems the initialization might change your result and also the convergence rate. I will try initializing the velocity inlet to inlet velocity Ravi