LIGGGHTS® - User Forum

I have been trying to model repeated load triaxial test. It's a stress-controlled test. I was able to match the loading curve but during unloading force is suddenly dropping to lowest levels. I experimented with different kp values for top servo wall and defining several unloading target levels but I did not get desirable result.
I am attaching some of the pictures for reference. Please let me know if I can do something to achieve the proper result.

Hello everyone, I'm using the latest version of LIGGGHTS and atom style superquadric on a university cluster. I want to do parallel computing of superquadric but it seems like that there is no difference in computational time for using 4 or 8 or 12 cores of CPU at all.

I wanted to ask if there is some rule for distributing CPUs for a simulation or some kind of lack of mpi library for parallel computing of superquadric atom_style?
I appreciate any helpand tips regarding this issue.
Thanks in advance, Hamed

Hello LIGGGHTS users:
I want to count the number of the particles contact with a specified wall every time step, is there any commend can be used to implement this???
Thank you!
Zhang Peiyun

Hello LIGGGHTS users:
I want to count the number of the particles contact with a specified wall every time step, is there any commend can be used to implement this???
Thank you!
Zhang Peiyun

Hello LIGGGHTS users:
I want to count the number of the particles contact with a specified wall every time step, is there any commend can be used to implement this???
Thank you!
Zhang Peiyun

Hello LIGGGHTS users:
I want to count the number of the particles contact with a specified wall every time step, is there any commend can be used to implement this???
Thank you!
Zhang Peiyun

Hello,

I have a cylindrical mold and wish to simulate isostatic compaction of a powder within the mold. Is it possible to use the mesh/surface/stress/servo command to apply a force in a radial direction, such that the force is applied to the center of the mold?

Thanks

Dear Ladies and Gentlemen,

is it possible to create cubic or cylindrical particles and to assign to them the hertzian contact model with friction?

I would like to model the movement of a block or cylinder along a defined way and to analyze the velocity during this movement.

Best regards and thank you

Mateus Kostka

I'm trying to simulate a powder scraper to analyze the effects of moisture content by using the easo/capillary/viscous model. When I want to have a liquid content of 2% should I input 0.02 or 2.0? Another question: will my output files output forces as Newtons or dynes if I am using cgs units?

Hi

I was doing am impact simulation with multi-sphere particle(see figure below). I wanted a plot of Kinetic energy for each multi-sphere particle and for that I have used the following command

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compute ke_clump all ke/multisphere
dump dmp all custom/vtk ${nstep} post/particle_*.vtk id type mol x y z ix iy iz vx vy vz fx fy fz omegax omegay omegaz radius c_overlap c_ke_clump
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