LIGGGHTS® - User Forum

Hi all,

I want to simulate a belt conveyor with ribs on the surface. (stl attached)
For a flat belt i would usually use the surface_vel command to specify the imported mesh as conveyor belt.
The Problem about this command is that there is no motion of the ribs. Think this behaviour is expected.

I am trying to use the insert/rate/region command to create a cylinder filled with particles. I have not been able to figure out what role the nparticles keyword plays in determining the number of particles added. I thought that the total number would be limited to "nparticles", but when I run the simulation new particles keep being added after reaching "nparticles". How do I create a region with a fixed number of particles? The code is below. Thanks in advance for your help.

I want to add a force on all atoms in region and the force is related to the coordination of the atoms? How should I specify the force variable? Thanks in advance.

In the newly released LIGGGHTS(13 jun13) , some functions such as “Fix mesh/surface”, “Fix Property/global” are missing. I further check the input files, the related cpp and h are missing in the Rtc folder. Is the function outdated in the lasted LIGGGHTS or should I copy the files on my own from previous version?

Thanks

Hello everybody
I am beginner with the LIGGGHTS and have a fundamental question.
What are the limitations to use LIGGGTHS for simulation of nano-particles in aqueous media? Is this software restricted only for granular microscopic particles or even applicable for simulation of mesoscopic colloids? For example, can it be an alternative for DPD (Dissipative particle dynamics) or SRD (Stochastic rotation dynamics) methods in simulating colloids sedimentation or aggregation?
Regards

I want to use the fix move/mesh with the linear/variable style but I don’t know in which way I have dot define the variables for the velocity. Is it an array that has the same number of elements as time steps? Or is it a scalar and I have to change its value every time step. Can you give an short example please.
And a further issue, is it possible to import data form a file, so that I can impose measured motions.

See - http://cfdem.dcs-computing.com/?q=node/920 . I didn't know if my comment would be more pertinent for a user forum or not.

I compile the LIGGGHTS (2013-Jun13) on Cygwin Platform using the make_serial, the message shows “INT64_MAX” undeclared in update.cpp. Can anyone help me out on this issue?

Hi,

What would be the best way to calibrate the simulated particles to behave like a real granular soil and how to demonstrate this?
Is there a way to run some virtual triaxial and shear tests which can be compared to real measurements?
Has somebody done already so and would be willing to share some information?

Cheers
Günter

Hi everyone,

In the simulation, I want to delet the particles which run out of the region. How can I do that? which command Should I use and where I should put the command after creating the particles in the in. file or the end of the file?
thanks in adance.

yyu