Hello Ram,

Thank you for your reply. I checked the MAT_SPH_VISCOUS and I found it does not support inputting yield stress - quote from material manual "This material since it is based on the null material has no yield strength and behaves in a fluid-like manner."

Yield stress is an essential to the concrete material behavior I need to simulate. Again, I need both yield stress and viscosity to be defined in the material model. Could you suggest some alternatives in this regard? Thanks!