LIGGGHTS® - User Forum

Hi everyone,

I am just coming back with a new equiry on CFDEM coupling.

dear christoph,
thank you for your reply,
I have attached my input files plus their restart files and stls. I will be so gratefull if you take a look.
I want just emphasise that when I unfix mesh walls just before write_restart in in.loading and then fix them again at the beginning of in.shearing the error (below) is solved. but I am not sure what happens if I do so.

ERROR: Incompatible mesh restart file - mesh has different properties in restarted simulation (multi_node_mesh_parallel_buffer_I.h:198)

Hi

I'm having a problem with a pair of simulations in which I use two particle insertions to fill the system. Each simulation seems to run fine in serial mode, but crashes during the insertion phase when I try to run in parallel. It also runs fine if I turn off one of the insertions. I've also tried this with both insert_stream and insert_rate_region.

Hello,

I simulate a chute for sortimg machines. I am interested in the behaviour of the objects to sort especially the velocity vector of the particels at different points of the chute. Particular importance concerns to the point the objects are leaving the chute.

Is there a solution in LIGGGHTS to solve my problem.

Thanks,

Detlef

Hi all,

I have a script that works perfectly on a single core (i.e. no MPI), but when I run in MPI it runs fine for a while, and then after a region definition gives an error:

ERROR: Unable to calculate region volume - are you operating on a 2d region? (region.cpp:586)

Any clues if this is a bug, or a problem in my script? In the source this comes from:

Hi,

Hello

I have a problem regarding the movement of particles clumped together with the help of "fix rigid".

My simulation consists of a vibrating plane (stl-mesh). The clumps are on the top of this plane.
If I simulate the clumps, the moving behaviour is not like it should be.
My clumps look like cubes and consist for example of 3x3x3 particles of the same size without any overlaps.
The simulation works well for single spherical particles or for clumps with 10x10x1 (like a disk flat on the top of the plane).

Hi everyone,
Is there anyone know how to output the contact forces (particle-particle and particle-wall) of every particle? Is it need to compile for dumping the contact force? Thanks.

Hi,
I am a new user of Liggghts and have some problem. I am trying to use compute pair/gran/local command for calculating the contact force of grains. I know that this compute calculates a local array which can not be used as a variable.
1. how can I perform some math operators and functions on specific columns of this local array (for example use ^ or * and then calculate the sum of all the vector elements)?