LIGGGHTS® - User Forum

Hello all,

as I read in the newest release, it is now possible to calculate multisphere simulations with multicore processing.
So I updated the latest version and tried to simulate the multisphere example with mpirun -np 4 liggghts -in in.multisphere.
But it did not work.
Did I somehting wrong?

Regards,
Westbrink

Hello everyone,

I just updated from LIGGGHTS 3.4.1 to 3.5 and came across the following problem:

When using the fix "insert/rate/region" with option "all_in yes", my model crashes with the error "Fix insert: Region volume calculation with MC failed (../fix_insert_rate_region.cpp:101)".

With "all_in no", everything works fine. I was able to use the option "all_in yes" with LIGGGHTS 3.4.1.

Kind regards,
MiRa

Hello everyone,

I just found a problem when I tried to run following input file. It showed an error as below.
The strange thing is that the code works fine when I change the particle radius into 0.00036.
I'm not sure why increasing the particle size can solve this problem, and why the number of bins is related to the particle radius.
I'm very grateful if anyone can give me some comments or advice.
Thank you very much!

Jason

Hello,

I was wondering if it was possible to pad a restart file the same way I can pad my dump files. By example, I have :

dump dmp all custom 800 postLoading/loadingKiln_*.dump id type x y z vx vy vz fx fy fz omegax omegay omegaz radius f_Temp[0]
dump_modify dmp pad 6
restart 1000 restart/loadingKiln*

Is there a way to do something like :

restart_modify pad 6

So that my restart files all have the same number of characters and get in order?

Thank you very much.

Christine

Is there is a way to change the coefficient of restitution of particle collisions with a mesh area so that it varies depending on the wear it has received from particle impacts? I'm trying to create a model of shot-peening however, I can only seem to see how to change global settings to a user defined value.

Thanks,
Callum

I noticed that the command "compute contact/atom" dose not work for multisphere, but there is not any restrictions on the online manual.
So is there any alternative method that can track the average coordination number of a system composed of multisphere clumps?

Dear all
I have installed latest version of liggghts, but it doesnt read restart file, I know that this input file is running on other computer by liggghts version of 2.3.8.
I want to install 2.3.8 version. how I should do this?
any help is appreciated

Hello every one.... i am new to LIGGGHTS, I am trying to simulate a phenomenon where a blade is moving inside a box from one end to other end. Particles are there inside the box upto the blade height. Is there any command in LIGGGHTS which i can use to produce multiple passes of blade. Currently the blade move from one end to other and stop there, i want to move blade back and forth 15 time between the two ends. Kindly if any one has the idea then guide me. Thanks

hello,

I've been working with liggghts for a while. I have simulated the impact of two rigid bodies and now I would like to analyze the movement of the particles that form the body as if one of them could break . Something similar to what happens in this video ( shown in LIGGGHTS -PUBLIC FEATURES section):

http://www.cfdem.com/media/DEM/nonspherical/lammps_granular+multibody_.wmv

Hi all,

This is an issue I have had before & thought I had solved it, but have encountered similar problems with another model.