segregation of cubic particles

Submitted by sadgi rawat on Mon, 07/16/2018 - 13:09

what atom style should be used to have cubic particles for segregation.Will superquadrics atom style work by specifying blockiness of 300?

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arnom's picture

arnom | Thu, 07/19/2018 - 09:40

This blockiness is way too high. We suggest not using a value higher than 16 (and even that is stretching it)

DCS team member & LIGGGHTS(R) core developer

sadgi rawat | Mon, 07/23/2018 - 10:14

I have use superquadric atom style and particle template superquadric to run simulation of cubic particles with blockiness 15.Is it fine?
Also,i'm visualising it using paraview.I've added tensor glyph filter in it.In "Glyph type" option,which type should i use to view my cubic particles.

medvedeg | Mon, 07/23/2018 - 16:32

Hi,

I would suggest to use blockiness not higher than 8. Such blockiness provides already 94% of volume approximation

Alexander Podlozhnyuk

sadgi rawat | Wed, 08/01/2018 - 08:28

In paraview,while applying tensor glyph to my file..if i choose superquadric glyph type,then oblate are looking fine but cubic particles are looking like sphere..,and if choose Box glyph type,then cubic particles are fine but oblate also looks like cube.How to resolve this problem

Daniel Queteschiner | Wed, 08/01/2018 - 12:31

The superquadric tensor glyph plugin is actually not intended (and most probably cannot be used properly) for the visualization of superquadric particles.

sadgi rawat | Wed, 09/05/2018 - 11:02

still not able to visualise..can you be more specific on the steps i need to do to visulaise them.
p.s.- i"m new to LIGGGHTS

richti83's picture

richti83 | Thu, 09/06/2018 - 11:00

1st in input script use
dump dmp all custom 1000 post/rigid*.dump id type x y z quat1 quat2 quat3 quat4 vx vy vz fx fy fz blockiness1 to dump superquadric data
2nd install Paraview 5.4.1 and Download rigid reader [1], add reader using tools->manage plugins->load new
3rd open ridid*.dump in paraview, select liggghts_rigid_reader
4th download python filter: https://www.cfdem.com/system/files/304_transform_sq_with_colors.xml__0.txt rename to 304_transform_sq_with_colors.xml and add to PV using tools->manage plugins
5th In PV create a source superquadric, roundness=2/blockiness, scale=ex,ey,ez, deselect Torodial
6th In the pipeline browser select rigid*.dump AND superquadric source (press ctrl+left click) and than append filters->304_transform_SQ_colored to both
This will draw a superqaudric with correct shape and orientation at every center point in rigid*.dump file.
Have a look at this pipeline to get an idea how it should look:
https://www.cfdem.com/system/files/settings4pv_sq.png

[1] https://github.com/richti83/ParaView_Reader_for_LIGGGHTS/tree/master/pre...

I'm not an associate of DCS GmbH and not a core developer of LIGGGHTS®
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sadgi rawat | Mon, 10/22/2018 - 12:22

i have done what you mentioned.still.,i could see only one superquadric particle in my screen.how can i link that feature to all the particles i have in my file

lumblab227 | Mon, 12/24/2018 - 15:14

Have you solved this issue when you are trying to visualize the superquadric particles?