LIGGGHTS® - User Forum

I'm trying to use the new atom/vtk dump format...

According to the documentation the syntax is

dump ID group-ID style N file args

where atom/vtk args = none

I've tried the following:

dump dmp all atom/vtk 800 post/dump*.vtk

But I get the error: Invalid dump style (output.cpp:399)

Any suggestions from the LIGGGHTS gurus? Also with no arguments what exactly is exported with the atom/vtk output?

As subject says, I'm not sure if I'm implementing the "rolling_friction" part of the granular style correctly. I am simply trying to drain particles from a wedge shaped hopper and measure the mass flow rate using different values for friction. However, turning on rolling friction appears to have no effect, nor does changing the values for rolling friction - my mass flow rates are identical to not having rolling friction turned on.

Hi

Is it possible to have no particle-particle contact, but still have particle-wall contact? I want to test something were I don't have particles colliding with each other, but I need them to contact the walls so that they stay inside to domain.

As far as I understand it, I need "pair_style /gran/X" so that particle-wall contact can be calculated, so I have to specify that pair_style.

Hallo,

I would like to know if it is possible to visualise walls in paraview, which are implemented via "fix wall/gran/hooke/history".

For stl files, I dump the vtk files via dump mesh/vtk and open them in paraview, but this doesnt work for "normal" boundary walls (or does it?). Would be glad if someone may help me.

Kind regards
Philipp

I tried to use the insert/steam or insert/pack command to make the particle inject into the reactor by a certain velocity continuously, so I write these commands in the in.XXX file:

I'm trying to simulate a cylindrical particle damper and basically have my simulation up and running now. But... I can't figure out how to extract the quantity I'm interested in: the energy dissipated by the interparticle and wall collisions (either integrated over time or per timestep).

Any ideas? Thanks.

Could somebody help me to understand this piece of input code used for temperature trigerred shrinkage code

#set particle temperature for half the bed
1. region halfbed block 0 INF INF INF INF INF units box
2. set region halfbed property/peratom Temp 800.

Having problems here.

I have downloaded LIGGGHTS_2p2p2.tar

make package-status yields,in part:

Package.sh: line 11: cd: GRANULAR: No such file or directory
Installed NO: package GRANULAR

and indeed there is no src/GRANULAR subdirectory

pressing onward

make openmpi was successful

Hi all,
I'm trying to install liggghts in ubuntu but I've had some troubles. When I type "sudo apt-get install openmpi openmpi-devel" shows up the follow message :

Leyendo lista de paquetes... Hecho
Creando árbol de dependencias
Leyendo la información de estado... Hecho
E: No se ha podido localizar el paquete openmpi
E: No se ha podido localizar el paquete openmpi-devel

In order to get over this problem I followed instruction that I found on internet:

Hi,

HAPPY NEW YEAR ;)

I have successfully compiled balance.cpp and balance.h and then I recompiled CFDEM to introduce balance command to it. Now static load balancing command is activated in LIGGGHTS-PUBLIC and It works very well. Also I check it on the Cluster and everything seems fine.

But when I tried to run CFDEM I faced with the following errors. Then I separably checked ligghts in two state : 1. without restart file 2. with restart file. It seems when information read from restart file liggghts crashes.

Any one has any idea ???