LIGGGHTS® - User Forum

Hello,
I am trying to increment a user variable every thermo output.
Some background, I am trying to get a soil bed to a certain void ratio. I am doing this by stepping 5000 and then checking what my void ratio is. If it is my tolerance, I continue the simulation. If not, I step another 5000 and check again.
What I would like to have though is a continuous simulation time in my thermo output. I was doing this using

variable sim_time equal dt*elapsed

but every time I would reuse the "run 5000" command, elapsed. I then tried the following

Hi,
I am trying to run a triaxial test on a cube shaped sample. I currently inset stl files (3 files for the 3 faces) using the fix_mesh_surface_stress_servo command and another 3 stl files using the fix_mesh_surface_stress command. Once I have finished the consolidation stage of the test, I want to change the top mesh (currently servo controlled) to a non-servo wall so that I can apply a constant velocity to it. Is there a way of doing this?
Many thanks,
Rector

Hi,

I am wondering how could I get the previous version (3.5.0)? I ran a simulation with 3.6.0 using a restart file generated from 3.5.0 but get different results. Anything I could after git pull the repository?

Many thanks

Does liggghts include Burger's model? If not, anyone has any suggestion how to incorporate the Burger's contact model? Thanks in advance!

Hi everyone,

Greetings! I'm a student and a new user to Liggghts. My current work is to build a model which is a plate moving horizontally in a pool full of granular particles. Now my plate can move very well, but I don't know how to extract the total reaction force on the plate, can anyone give me a hint please?
Any help is very much appreciated!

Warm regards,
Carol

Hallo,

I have created one layer of particle by using the following statements:

Hi everyone,

I am using compute pressure command to extract the normal pressure on x,y,z directions. I managed to use this command by using compute all temp, but the temp result obtained by this command looks like the molecular temperature. finally, the compute pressure command gave a 6 elements vector rather than an array of one scalar and on vector documented on the websites.

does the 6 elements vector I got have the definition on those website of compute pressure?

Thanks
Weijing

Hello everyone,
I have a problem, which I could not solve on my own.
I have a complex rotating .stl-geometry.

When I'm doing a restart of my program, the geometry is lost (so I think).
Therefore, I initialize it newly but the former position of the geometry is lost.

i m working on simulation of poly disperse flow of granular material . when i try to run script file in terminal it gives following error . can any body tell me whats the reason of this error

Hello,

Is there any way to dump the multispheres properties so that I can visualise them correctly in Paraview, for their actual mass, volume or spherical equivalent radii?

Thanks

Best regards
Matteo