[Erfan-s]

Hello
Good time
I am investigating the transport of suspended sediment in a simple channel, the sediment diameter is 0.000217 m and the inlet concentration is 14.066 kg/m3 and the inlet velocity is 0.3835 m/s and I am simulating through the sediment scour model. And the RNG disturbance model and the mesh size is 0.011m, I have a lot of errors at the relevant measurement point near the bed and water surface, where is my problem? I made the cell smaller, but I still have an error

[koful]

Hi.

Your mesh size should be bigger than ten times of the grain diameter. Too fine mesh can cause problems. Did you check that? Also try to limit your max time step size

[Erfan-s]

It has been already supposed
could you help me finding a solution for this problem