LIGGGHTS® - User Forum

LIGGGHTS® related topics can be discussed here: discussion about models, installation, feature requests and general discussion

Forming Bonded Conglomerates

Submitted by driley on Fri, 12/20/2019 - 18:14

I am trying to generate a relatively large number of bonded conglomerates. However, I need the individual conglomerates to remain unbonded from each other. Is there a way to read in a text file with a specified bonded conglomerate in a way similar to multisphere? Or perhaps define bond creation based on material location at a given time step?

Velocity vector on boundary

Submitted by jagan1mohan on Wed, 12/18/2019 - 07:26

Hello Team,

Greetings. I'm using move/mesh fix to rotate a boundary (something like cylinder (top.stl, bottom.stl, curved.stl) filled with particles). Can we plot / extract velocity (mag) or velocity vector on the curved.stl boundary and view in post-processing? I'm using paraView and can create a glyph for particles but not for this surface?

Any method exists to export data on *.stl boundaries?

Thank you,
Jagan Mohan.

Temperature-Dependent Variables

40044600's picture
Submitted by 40044600 on Sat, 12/14/2019 - 19:58

Hello,

I am seeking to set up my simulations to allow for particles to have a certain cohesion factor dependant on their temperature.
I have seen from a previous post in 2011 that this is not a trivial thing to achieve but may be possible with some build around python coding.

I'm hoping someone could guide on a structure of things that need to be achieved in order to allow for temperature-dependent variable to be achieved.

Thanks

Particle injection fails.. please help

Submitted by jagan1mohan on Fri, 12/13/2019 - 20:41

Hello Team,

Greetings. I'm new to the LIGGGHTS software and trying to insert particles using the following script. I get an error which says
"ERROR: Fix insert/pack (id vlfrINJ3): overflow in particle number calculation: inserting too many particles in one step (../fix_insert_pack.cpp:345)"

I want to insert same particle(s) using two particle types as I want to track later type during simulation. There are being injected by vlfrINJ3 fix. Upon seeing this error, I reduced volFrac to a very low number but still I get same error? What could be the mistake in this?

dump cutom/vtk generating corrupted files when printing xu yu zu but with only x and y periodic

Submitted by iluvatar on Fri, 12/06/2019 - 20:47

Hi,

This is not a problem per se but maybe a suggestion for improvement.

I have a system periodic in x and y. When I use the following custom command, the vtp files are not correctly read into paraview, they just read as empty and the problem is an empty array that appears in the vtp files:

dump dmpgrow all custom/vtk 10000 post/growing_packing_*.vtp id type x y z xu yu zu ix iy iz vx vy vz fx fy fz omegax omegay omegaz radius

Not inserting all sizes of spheres

Submitted by mschramm on Tue, 12/03/2019 - 06:07

Hello,
I am trying to fill a box with 3 different sized spheres but only the largest two spheres are being inserted.

I have called the template fix 3 times with 3 different sized spheres then I call the distribution fix and have
30% for the smallest sphere, 35% for the med, and 35% for the largest but I am not seeing the smallest sphere.

I attached a simple file that replicates my error. LIGGGHTS version is the public 3.8 release.
Any help/suggestions would be greatly appreciated.
Thank you.

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