Specific frictionless walls

Submitted by nom on Tue, 05/08/2012 - 11:07

Hi,

Is it possible to define specific frictionless walls? (while certain walls and the particles among themselves have friction)

Thanks!

Forums:

Philippe's picture

Philippe | Thu, 05/10/2012 - 14:08

yes, it is possible. Simply assign a separate atom style to the frictionless wall and set the coefficient of friction accordingly.

greetz
Philippe

ckloss's picture

ckloss | Thu, 05/10/2012 - 14:42

also (depending on what you want to model), you might want to deactivate tangential damping - see fix wall/gran doc for details

Cheers, Christoph

nom | Tue, 05/15/2012 - 11:53

Thank you for your answers.

What's the difference between:
friction_damp_flag = 0 in the fix wall/gran/hooke/history command and set the
coefficientFriction = 0 in the fix property/global command between particles and the wall?

Thanks!

ckloss's picture

ckloss | Wed, 05/16/2012 - 10:42

friction_damp_flag controls tangential damping (damper force) and activates/deactivates the rolling friction mode
coefficientFriction controls the yield criterion for the spring part of the tangential force

I know this is a bit confusing, and we are going to improve/clarify this in LIGGGHTS 2.0

Cheers, Christoph