LIGGGHTS® - User Forum

Hi all,

I am trying to restart the simulation by changing the data file by using "read_restart tmp.restart.120000" command (120000 is the last iteration where I stopped my simulation)

But I was getting this error:

ERROR: Cannot read_restart after simulation box is defined (../read_restart.cpp:75)

Can anyone please help me in fixing this?

Thank you.

Dear users and developers,

I am simulating a simple container with an inlet and outlet (both have much smaller diameters than container diameter). I insert
particles at the upper side (in the inlet) and they fall under gravity through the container and out to the outlet.
The system boundaries are fixed and particle tracking is set to "lost" so to save computational cost (I am not interested in particles exiting the outlet, only while they are inside is what matters).

I wonder what is the difference between these two types. The sph examples available with LIGGGHTS use the 'sph' type, but the examples in SPH LAMMPS userguide use the 'meso' type.

Dear users,
currently i am working on a rotating drum mixing project. I found something is strange to me (please refer to the attached fig.). Sometimes the particles are jumping and flying. i had same issue in other mixer (the reason was due to the mesh). i have tried again playing with finer mesh. still have the same probelm. What do you think might be the reseaon? here is the parameter i am using:

Sorry for the simple question, but after searching I am unable to locate the pizza.tar.gz tar ball containing gran_pizza_17Aug10... can someone point me to this?

Hi,

I'm new to LIGGGHTS and need your help in setting up a run.
I'm getting following error,

ERROR: Mesh error: dimensions too small - use different unit system (multi_node_mesh_parallel_I.h:535)

I searched the LIGGGHTS forum and got a suggestion to change the STL file format to ASCII.
I changed the STL file format to ASCII, still the error persists.

Do you have any other suggestion to fix this error?

Best Regards,
Girish

Hello everybody,
I am a new bee to LIGGGHTS.
How can I have a book-keeping of the wall-properties of my domain? I just have to introduce a variable and I am not pretty sure about how to define it.
All I am doing is calculating the charge transfer from particle-particle and particle-wall contacts.
I am able to save the data about particle charge (q[i]=q[i]+dq) (q-charge) at each time-step.

Hi Iam a new user in liggghts. While doing one of the example insert stream, an error came that is not understood by me. I am attaching the command file, model and log file that iam doing.

Hi to all
I would like to use DEM to simulate the pushing of a granular soil due to a compressive
force from one of it's sides.
This subject is Geotechnics is called the stick-slip phenomenon. We have done the experiments on a box
filled with beads to simulate the granular soil. The box is open from the top but one of it's sides is a moving
wall that can be pushed towards the granular medium with a constant compressive force. Progressively in time
a line somewhere in the middle will develop to show where the soil will break.

Hi all,

I need to implement a DEM simulation involving capillary force between particles. I use a hooke/stiffness contact model.

The capillary force model is the Willett model:

Willett, C. D., Adams, M. J., Johnson, S. A., & Seville, J. P. K. (2000). Capillary bridges between two spherical bodies. Langmuir, 16 (24), 9396–9405.

The capillary force is given by a liquid bridge that is created when two particles come into contact and persist until a rupture distance is reached.

The first step (of a long path) is: