Dear CFDEMers,
I set up a case with dynamic Smagorinsky LES model, but I found one thing that, with the smooth case, LES model can give great result, but if I put one layer of sediment (fixed at bottom), the LES model still give the shear velocity u* like smooth wall, but the RANS model (komegaSST model) can recognize the particles and give a larger shear velocity which is close to the experiment.
Has anyone has met the same problem and could give me some advice on this?
Thank you so much!
Detian