LIGGGHTS® - User Forum

Hello,

I'm thinking about how to choose the optimal time increment for my simulations. I set up a very simple testcase in order to study the behaviour of contact interaction between particles and STL-geometries, defined as wall.
Video: http://www.youtube.com/watch?v=IBf3vUwHh-w
First, I calculated the timestep as provided by many posts in this forum with the formula dt = 0.2*dt_rayleigh:
r = 0.005
rho = 8000
Y = 5e6
nu = 0.3
G = Y/(2*(1+nu)) = 1923076.92

Hello,

Hi all,

I am trying to do simulation on a rotary drum, simulating the rotation by changing the gravity force. I hope you could help me. Here is my code:

atom_style granular
atom_modify map array
boundary p p p
echo screen
newton off

units si

communicate single vel yes

region reg block 0 2.4 0 0.314 0 0.314 units box
create_box 1 reg

neighbor 0.02 bin
neigh_modify delay 0

Hi,

I define a wall with the stl style, and I want to change the normal direction of this wall. Can anyone tell me how to do it ?

Thanks

I have the Ubuntu makefile for Opensuse 12.3 but the cluster system is on Suse 11. Can anyone please provide me the working makefile for Suse 11

Dear all,

i'm fairly new to LIGGGHTS and i'm simulating particles flowing trough a pipe with periodic boundary conditions in flow direction. I would like to count the particles per iteration which are passing my periodic boundary. I'm able to do so by dumping particle positions to a file and check the passing by a script.
I was wondering if there is a way to do so using LIGGGHTS?

Best regards
Felix V.

Hello everybody,

I'm writing you because I can not run a script with the fix pour/legacy. I do not understand what is wrong with my input file. After running the command liggghts

I already have Openfoam installed with thirdparty. I have openfoam 2.2.0 and 2.2.x installed.

My question is How do I install LIGGGHTS and then use it for coupled examples.

Hi,
I want to insert particles into a hollow cylinder. Can anyone tell me how to achieve this?
Thanks

I'm trying to simulate a particle size distribution. Using the attached file (with 8 cpus) leads to the wrong amount of overall mass (0.445609 instead of 0.360).

At first the number of 6755 particles (mass 0.359951) is calculated, which is ok. But then only 3904 particle templates (mass 0.293721) can be inserted at step 1. This leads to "WARNING: Particle insertion: Less insertions than requested (fix_insert.cpp:622)". Later on: "inserted 2851 particle templates (mass 0.151888) at step 33334 - a total of 6755 particle templates (mass 0.445609) inserted so far."