Hello FEATool community,

I am a college undergraduate engineering student using FEATool to model how wind flows around a simple building (cube or rectangle) for a senior year project. I have come across 2 big issues when trying to model this.

1.)Because air's Reynolds Number is so high, my velocity spikes and goes extremely turbulent. I've attached two images of a small scale and large scale study. I've tried increasing the maximum non-linear iterations with a finer grid size with some improvement, but I was wondering if there was any way to better model what I am trying to. I am currently using the stationary solver and using mumps linear solver in the pdf attached

FEAToolWindHelp.pdf2.)Is there any way to implement some sort of surface roughness at the walls? I am currently using no slip at the walls. I had seen the Fluid-Structure equations seem to be able to do it but it the documentation says it is more for laminar flow.

Help would be greatly appreciated and thank you in advance.

Best,