Learning Forum

[cs11]

Hello, I want to model fresh concrete as a Bingham/Herschel-Bulkley fluid using SPH method in Ansys-LS-DYNA. It'd be the best if I can input a loading curve of shear stress vs shear rate for the material model, or a combo of yield stress vs time and viscosity vs time. I was unable to find the exact material model compatible with SPH to use [I checked the material selector tool]. I was wondering if you can share some insights of alternative material models I can use? If fresh concrete specific models are unavailable, is there a generalized non-newtonian fluid model I can use? Am I able to customize a material model? Thank you!

[Ram Gopisetti]

Hi 

Based on the element formulations, The best model for Non-Newtonian fluid will be the *MAT_SPH_VISCOUS, also check the *MAT_ALE_VISCOUS too if you want to adapt ALE 

Cheers, Ram 

[cs11]

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!