Learning Forum

[raju.chowdhury]

Hi, I am simulating droplet-solid interaction using VOF multiphase model. How can I add the wall surface roughness 0.06 micro meter?

[Rob]

There are wall roughness parameters for turbulent flow, but that's not useful here. At 0.06microns there isn't much you can do, if you want to add the roughness to the CAD it'll be lost in the tolerances. What are you trying to find from the model?

[raju.chowdhury]

I want to investigate the effect of roughness on droplet spreading.

[Rob]

So you'd actually need to resolve the surface distortions? Otherwise it's a factor to add to a source term into momentum equations or a fudge on surface tension at the free surface.