LIGGGHTS® - User Forum

Hi,
I'm pretty new to LIGGGHTS and I'm trying to incorporate heat transfer from an intruder placed within a granular system and the grains themselves.
The intruder is a simple creation and just made of a set of particles stuck together. So far I've only been able to set these particles that make up the intruder to an initial temperature that then cools as the heat dissipates into the surrounding granular bulk. But I want to fix the temperature of the intruder so that it remains at a constant temperature to assess how it dissipates heat through the granular bulk over time.

Hi!

Im using a contact model that does not include viscoelastic damping for normal contact (Thornton&Ning). I would like to be able to turn on contact damping. Is there some fix or way of adding viscoelastic contact damping or should I go into the code and implement it?

Thank you!

BR
Per

Hello all,

A segmentation error occurs in the calculation of cohesive particles.

There is already a topic, but I couldn't solve it, so please advise.

Is it possible to dump the LIGGGHTS output files into the vtm, pvd format?
I think pvd used for the summarizing the time step information and vtm used for dumping the data into some particular post folder

Thank you

How to give mass, the moment of inertia to the mesh file while importing it to the LIGGGHTS scripts. I considering mesh file as rigid body ?

Thank you

I recently installed LIGGGHTS on Ubuntu and run the example simulation.Then i wanted to run my own simulation so i created the 3D model and wrote the script using the LIGGGHTS official Documentation but when i am running it it is giving me a error:

"ERROR:Could not find fix group ID(../modify.cpp:782)"

My script is:-

# Preliminaries
units si
atom_style sphere
atom_modify map array
boundary f f f
newton off
communicate single vel yes
#processors 2 2 3

Hello,

I am trying to simulate a wet powder and calculate the friction between the substrate and the powder.

I'm trying to calculate the friction force from the spring force.
This is a simple model.
Spring the substrate and the block together and move the block. This creates friction between the block and the powder. This is calculated as the spring force equals the friction.

Now the "fix insert/pack" command doesn't work for creating particles.

I've posted the file and would like your advice.

I am trying in install liggghts on ubuntu and i have done half of the processes but i am stuck at the "make auto" command when i type make auto i am getting this error

Creating list of contact models completed.
make[1]: Entering directory '/home/pakhi/LIGGGHTS-PUBLIC/src/Obj_auto'
Makefile:456: *** 'Could not compile a simple MPI example. Test was done with MPI_INC="" and MPICXX="mpicxx"'. Stop.
make[1]: Leaving directory '/home/pakhi/LIGGGHTS-PUBLIC/src/Obj_auto'
make: *** [Makefile:114: auto] Error 2

Hello All,

Hello Everyone,

I am trying to simulate the motion of granular particles in a microchannel incorporating the DEM collisions and Fluid-drag forces on each particle.

I wanted to ask is there a way to incorporate Brownian Motion aswell?