How to turn off drag forces to part of particles in coupling mode?

Submitted by keepfit on Mon, 03/31/2014 - 11:24

Dear LIGGGHTS/CFDEM developers,

I am interested in modelling fluid-clusters interaction using the LIGGGHTS-OpenFOAM coupling scheme. However, I am facing a problem on the calculation of drag force on clusters (or non-sphere particle).

The cluster is composed of large number of spheres, since drag force is Surface Force, that means there is no drag force acting on the internal particles within the cluster. but the default CFDEM solver will calculate drag force on every particle, hence the Resulting drag force on the Cluster is much bigger.

I would like to ask, how to turn off the drag force calculation to certian part of particles. For example, if the internal particles are groupe A, and particles on the cluster surface are Group B, we should not calculate the drag force for group A. How to figure this out?

Best regards,

David

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ckloss's picture

ckloss | Fri, 04/04/2014 - 11:00

>>I would like to ask, how to turn off the drag force calculation to certian part of particles
You could e.g. change the fix group for the fix couple/cfd/force command

Christoph

keepfit | Fri, 04/04/2014 - 14:29

thanks Christoph,

I will try this method and post some results later on.

David