appropriate pair_style for sand simulation

Submitted by rasoul on Sat, 09/07/2013 - 15:43

Hi,
Do you know what is the appropriate pair_style for sand or shale or clay simulation?

Thank you for the response in advance.

Sincerely,
Rasoul

richti83's picture

richti83 | Sun, 09/08/2013 - 09:11

hertz/history with epsd2 rolling-friction model.
see "Rolling friction as a technique for modelling particle shape in DEM" (WENSRICH/KATTERFELD in Powder Technology) for details.

I'm not an associate of DCS GmbH and not a core developer of LIGGGHTS®
but I have 7 years user experience using LIGGGHTS®, ParaView and LINUX

rasoul | Sun, 09/08/2013 - 10:16

Hi Mr. Richti,
Thank you for the response. What do you mean by epsd2?
What is your idea about using gran/hertz/history/stiffness?

I don't know why all particles in the simulation domain throw out of the domain while I consider less than 30% T_Re for time step.

Sincerely,
Rasoul

xiuhan | Mon, 09/09/2013 - 10:03

in the Manuel, U can find descriptions about the model and also epsd2, that's in the chapter pair_style/gran part. there is also reference papers you can check at the end of the chapter.

xiuhan

zamir | Sun, 09/22/2013 - 20:06

Pair/gran/hertz/history works pretty well. See this paper for a pretty decent calibration technique:
"Influence of relative density on granular materials behavior: DEM simulations of triaxial tests" by Salot et al 2009.
The last section of the paper describes how some pair interaction parameters affect mechanical responses.