Compression with the top wall

JF's picture
Submitted by JF on Mon, 06/14/2010 - 15:20

Hi everyone,

I added this command in my file in order to move the top wall:

region topwall plane 1. 1. 1. 0. 0. -1.0 units box vel 0. 0. -0.1

I must define the interactions between the wall and the particles with this command:

fix wall1 all wall/region topwall gran/hooke 1.0 1.0 0.002

But I think that there is an error on the type of interaction (style). How can I define these interactions ?

My second question is: How can I get the normal force applied on the top wall or directly the normal stress ?

Regards
Jf

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ckloss's picture

ckloss | Mon, 06/14/2010 - 15:42

Hi JF,

if you look up in the doc for wall/region, there is no style hooke available. For granular styles, you have to use fix wall/gran/hooke. If you want your wall to move other that the wiggle/shear option in fix wall/gran/hooke, you can use an STL file for that (e.g. 2 triangles for a planar wall) - please see the moving mesh example for details

>>My second question is: How can I get the normal force applied on the top wall or directly the normal stress ?
If you are using a CAD wall - that will be included in the next release. If you use other kinds of walls, you would need to define a new fix or compute for that

Christoph

JF's picture

JF | Mon, 06/14/2010 - 16:22

Hi Christoph,

Thanks for your quick reply. In following your advice, I will use the commands (mesh_gran and move_mesh_gran) and I will define the top wall in STL format.

Concerning the normal force on the top wall due to the spheres, I will wait the next realase.
Thanks for your developpments.

Jf