LIGGGHTS® - User Forum

Hi

I asm quite novel to LIGGGHTS and I created my first simulation. I only selected to create 500 particles with radius 10 mm.

I get this error when running the simulaiton : Error too many atoms sorting bins

cheers
michele

Hi Chris,

I recently modified the original cfdemSolverPiso from PISO to PIMLE (merged PISO-SIMPLE) loop, i.e. supporting adjustable timestep for CFD solver. It helps speeding up the calculation when CFD domain contains millions of cells.

In priciple the new CFD-DEM solver works fine, and if the CFD "adjustTimeStep" option is turned off, the solver is more or less same to the original one. However, there are some remaining issues:

"LIGGGHTS INSTALLATION GUIDE FOR UBUNTU 12.04 LTS, 13.04 LTS, 14.04 LTS, 15.10, LTS 16*, LTS 18*"
NOTES: 1. This documentation was written long back since when several changes have been made by LIGGGHTS developers that made the installation relatively easy. However, to have backward compatibility those outdated instructions for installation are still available but are deprecated with special notes.

Hi,
Do you know what is the appropriate pair_style for sand or shale or clay simulation?

Thank you for the response in advance.

Sincerely,
Rasoul

thread can be deleted
// used an old liggghts version.

Hello,

I'm a student from Germany and a newbie in using Liggghts.
I'm trying to import a STL-File from a CAD-Software and I get the following error:

Reading STL file 'behaelterNX.stl'
Setting up run ...
ERROR: Mesh error: dimensions too small - use different unit system (multi_node_mesh_parallel_I.h:536)

I have no idea what's wrong with my code or with my STL file and I hope that I get some help here in this forum.
During the simulation several particles should fall into a container and later I want the container to move.

Hi!

I am using the compute pair/gran/local for working out the magnitude of the crossed interactions. However, I'm not able to put my output file, apart from the particles ID, the radius and velocities of each particle.

I can extract these values dumping with the "custom" style, but not extracting with a c_ID using the dump "local" style.

Thanks!

Hi All,

I want to print the diameter of a single atom. I am running into some trouble. Here is my logic:

#find the atom I want to measure
group one_atom id 3
#compute the diameter
compute diam one_atom property/atom diameter
#run the model for zero timesteps (or 1 ts, it doesn't make a difference)
run 0
#store the diameter
variable diameter equal c_diam[1]
print "diameter ${diameter}"

I get an error that says:
ERROR: Compute used in variable between runs is not current (variable.cpp:858)

Hi,

to differ moving particles from fixed, I am using fix store/state to store a displace/atom compute as per atom vector on different time steps. So I can make a dump after the last run with all displacements over several time steps and calculate the magnitude of all displacements.

...
compute disp all displace/atom
...
run...
...
fix disp1 all store/state 0 c_disp[1] c_disp[2] c_disp[3] c_disp[4]
...
run...
...
fix disp2 all store/state 0 c_disp[1] c_disp[2] c_disp[3] c_disp[4]
...


Dear all,
i'm trying to use the fix massflow/mesh with liggghts version 2.3.6 and get a segmentation fault after some timesteps. My setup to test and reproduce the message is a simple cube without a bottom or lid. Some atoms will be placed inside, fall down and leave the box throuth the bottom and re-enter the box from above (since there is a periodic boundry in z-axis).

I attached the testcase with my liggghts script, the logfile and two mesh files. Please remove the ".txt" extension before using it.

Many thanks in advance!

Cheers,
Daniel