LIGGGHTS® - User Forum

Hi there,

I'm new to LIGGGHTS but I have been trying to use buoyancy and am getting odd results. I have read the documentation of 'fix buoyancy' and I am not sure about why dim level must be positive.

Documentation:
dim value = x or y or z
x, y, z = define the water level as x=const, y=const, z=const plane
level value = lev
lev = water level in length units, along the axis defined by dim

Hi,
I'm trying to simulate the heat generation inside the particles due to a nuclear reaction.
Is there a command to set a constant heat generation to the particles?

thanks

Simone

Dear LIGGGHTS users and its creators,
I have just started using LIGGGHTS for DEM Simulations. I have been using LAMMPS for around 2 years now for the same. I have seen that LIGGGHTS takes constant coefficient of restitution as input even while we use Hertzian model. I don't see the point of providing the coefficient of restitution as input when I am providing the Young's modulus and Poisson's ratio. Moreover, the coefficient of restitution along with collision time is a function of velocity and making coefficient of restitution doesn't make much sense.

I have issues concerning setting youngs modulus to a realistic value like 10 GPa. This requires insanely small timesteps.

In the documentatiom and in every thread on this question people say that it should not be bigger that 5e6 for si units or 5e5 for cgs.

But how would I go about modeling a simulation of a material that has a youngs modulus with magnitudes several times higher than 5e6 for the simulation?

Hello

I'm trying to perform the simulation of a chute, and I've been experiencing difficulties ... some I can solve by analyzing the forum, others I can not. My in.conveyor that I am using:

https://paste.ubuntu.com/25019462/

My problem is in section "PARTICLE INSERTION"; When I try to run with 'insert/stream' the Liggghts show me the erro:

Hi,

I am trying to run a simulation in Liggghts... when I run it by mpirun (with 6 threads) each processor use about much memory. The memory that have been used increased by time.

How could I reduce memory usage?

Any can help me with this: ''ERROR on proc 0: assertion failed''
_____________________________________________________________________________________________________________________
boundary m m m
units si

region domain block -3.7 2.6 -4.2 3.9 -4.5 1.95 units box
create_box 3 domain

neighbor 0.003 bin
neigh_modify delay 0 check no

Dear All
does anyone have reference for calculation of directional heat flux in the DEM?
The LIGGGHTS calculates heat flux based on distance of two particles in contact. I checked a code but I hesitate about the LIGGGHTS calculations.
Regards

Hi,

I need the properties of ROM ore (iron Ore), could anyone make it available?

Thanks.

Hi,

I was going trough the LIGGGHTS examples and had a problem after simulations 'cohesion' and 'insert stream'. I tried opening the post-files with ParaView 5.4.0-RC2 but the programm couldn't find the right reader for the post-dump files.
Apparently the dump-files are saved as dump_xxxx.cohesion and dump_xxxx.stream. (xxxx as a number like 8000)

What should i do to be able to view the results on ParaVew?

Thanks