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How to show contact force on particles or polyhedre using changing colors

Asked by Kun Zeng

Hi,

I was wondering if there is a method to show contact forces with changing colors on paricles or polyhedre in paraview? Thanks.

Regards,

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Jan Stránský
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Luc Scholtès (luc) said : 		#1

Hi,

I am not sure to understand your request ("contact forces changing colors on particles"?) but it is possible to see the principal stresses applying on each particle by adding the 'bstresses' attribute in the VTKRecorder (along with the 'spheres' attribute of course). Then, you can select the stress you are interested in and color the glyph associated to each point (e.g. a sphere) according to the stress magnitude. If you want to see the interaction network, it is also possible by adding the 'intr' attribute in the VTKRecorder. Then, by selecting the component of the forces you want to see (normal or shear) and coloring it according to their intensity you can see how the forces are distributed in your assembly.

I don't know if these options work for polyhedron though.

Luc

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Jan Stránský (honzik) said : 		#2

Hello,
https://yade-dem.org/doc/user.html#rendering-interactions-as-force-chain
cheers
Jan

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Kun Zeng (zkbread) said : 		#3

Hi,

Thanks for your suggestions.

I mean if it is possible to show the contact force on the surface of the polyhedra particles not using force chain.

Thanks

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Best Jan Stránský (honzik) said : 		#4

There is export.VTKExporter.exportContactPoints [1], which could suit your purpose. You can export force something like (not tested):
##
vtkExporter.exportContactPoints(what=[('force','i.phys.normalForce+i.phys.shearForce')])
##
and then use arrow glyph in paraview
Jan

[1] https://yade-dem.org/doc/yade.export.html#yade.export.VTKExporter.exportContactPoints

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Kun Zeng (zkbread) said : 		#5

Thanks Jan Stránský, that solved my question.