LIGGGHTS® - User Forum

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.

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

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?

Hi,

I would like to remove the mesh after applying the desired stress by using fix/mesh/surface/stress/servo.

I have come to know about "surface mesh feature remove" as indicated in the following links:

https://www.cfdem.com/forums/surface-mesh-feature-remove

https://www.cfdem.com/forums/removed-meshsurface-34-version

Hi Mschramm,

In addition to our last conversation please see the attached a new full input script with mesh, the error as shown below:

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


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.

Dear all
I cant find any source code that directly related to those.
and is it possible to dump voidfraction and uf (fluid velocity) in the LIGGGHTS side?

regards

Tom

Hello Team,

Hello,
I want to fill up a cylinder with particles. I try the following code, but get an error "Expected integer parameter in input script or data file". Since LIGGGHTS does not tell which line has the error I tried changing every float value to integer to see what's wrong, but I could not find the problem.

I would be grateful if someone helps me out! The code's attached herewith.