LIGGGHTS® - User Forum

Hi,

I am trying to write the mass of contained within a region to a file. I get an error at
step 10000 (I call the fix print every 10000 cycles) and the program exits. Could someone help me with my problem.

I am trying to follow the example shown in the "How To Liggghts" document under the calculate mass flow section (section 6).

My script and other associated files are attached.

Thank you

Kirk

Hallo everbody,

I've got a Problem when simulating larger number of Particles.

For instance, i've created a simple simulation for testing with 10000 Particles over 50 timesteps. The simulation starts and finishes quite fine in a few seconds.

Then I take the exact same simulation (particles are insertet via: fix ins nve_group pour/dev nparticles ${n_Particle} 1 distributiontemplate pdd1 region bc) but with n_Particle equal 1000000.

Now simulation starts and on my screen it is displayed:

...
Setting up run ...
Memory usage per processor...
step atoms ....

Hi, all.
I'm new to LIGGGHTS and Linux OS.
When I follow the Installation Tutorial to install LIGGGHTS, I get a problem.

My OS is Fedora 16.

1. when typing "which mpirun"

-------------------------------------------------------
/usr/bin/which: no mpirun in (/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/jian/.local/bin:/home/jian/bin)
-------------------------------------------------------

The above information is right? or openmpi is not installed well?

2. in /src directory, type "make clean-all", then "make fedora -j"

Hi!

I have recently switched to LIGGGHTS 2 and having some issues while running the insert/rate/region fix.


fix ins1 nve_group insert/rate/region seed 10001 distributiontemplate pdd2 mass 3.888 massrate 3.888 insert_every 1 region bc


But it give sthe following warnings, could anybody explain the reason. I am also attaching the input script.


WARNING: Particle insertion : Inserting no particle - check particle insertion settings (fix_insert.cpp:469)


Thanks,
TM

Hello, recently i used Liggghts Version 2.1.1 to do some simulations, howver I found two problems.
First, I found the simulation using Version 2.1.1 was very, very slow, I guess it was probaly about 6 times slower than the simualtion suing Version 1.5.1.
I don't know if anyone has similar problem.

Second, i met "insert region" problem when there were four materials in the simulation, it seems Liggghts didn't recoginze my definition of insert region
however, there was no such problem for the simulation with three materials. I attached my input file, maybe someone can help me with it.

error message

=======================================================================
LIGGGHTS (Version LIGGGHTS-PUBLIC 2.0.7, compiled 2012-08-25-16:06:53 by spe based on LAMMPS 20 Apr 2012)
Created orthogonal box = (-0.85 -0.08 -0.08) to (0.01 0.08 0.14)
1 by 1 by 1 MPI processor grid

Reading STL file 'barrel.stl'
Solid body detected in STL file
End of solid body detected in STL file.

Reading STL file 'screw.stl'
Solid body detected in STL file
End of solid body detected in STL file.

Hi All,

I want to learn how to set up the model of A rotary drum shown in the LIGGGHTS Feature, moving mesh. Is this model in the liggghts examples? or How can I find it?

Thanks,

Kun

Hi,

Hello,

I have met a problem by using restart. i have three related files. First one is for generating particles using "insert/pack", the second one is for making all paritlces settled in a box, the thrid one is for moving mesh box using "fix move/mesh" as follows:

"fix shear1 all move/mesh mesh top linear 0.005 0 0"

however I got following error message:

"ERROR: Illegal fix move/mesh command, illegal mesh ID provided (fix_move_mesh.cpp:63)"

acutally, i defined the mesh "box" in all three files using "fix mesh/surface/stress".

I just had a quick question. I hope it's okay. I am trying to do a comparison of the various forces present within my granular simulations and want to plot these in an excel spreadsheet.

I am using the gran/hertz/history pair_style but I am having problems seeing how the cohesionEnergyDensity is used. I cannot find mention of it in the manual so if anyone could point me in the right direction, or better yet let me know the equation that it appears in that would be really helpful for me!

Thanks!

Paul