LIGGGHTS® - User Forum

Hello everyone,

I am doing simulation of roller compactor. I want to calculate density of material which flow throw screw augers. For this I need a mass of particles, which are in defined region at different time steps. So I am wondering which command can give me a mass of particles in defined region for example every 10 000 time steps???

You can find picture in attachment. Picture is showing in which region I want to know mass of particles.

Best regards Neven.

Hi, I want to built a colloid model in liggghts. I didnt know how to do , so i use folloing way:
1. copy package COLLOID from lammps, but when i use command "cfdemCompLIG"or "make fedora", it has a lot error
2.i try to use the file in lib/gpu, but you guys say it is not suitable for ligghts
3.if i could use python?
so, can you tell me how to built colloid?

Dear all,

I have a simple question.
How apply a force on the top of the system of the image?

I tried the fix aveforce without success.
My in file is attached.

I thank you in advance.
Daniel Oliveira

LIGGGHTS stands for LAMMPS Improved for General Granular and Granular Heat Transfer Simulations. why granular is coming twice?

Thanks in advance

Servo mesh behaves after restart like a usual wall which doesn't react to a changing contact force.

Hello,

Hi everybody,

currently i am trying to simulate a bucket elevator. I am interested in the forces on the buckets.
To speed up the simulation i import the buckets as soon as they are needed. Therefore I have to unfix and refix the meshes with the wall/gran fix.

The force on the buckets are written to a file with the ave/time fix.
If I take a carefull look at the results, I can find a jump in the forces every time i unfix and refix the wall/gran command.

Dear my friends,

I am running a simulation using write/read_restart. When using read_restart, I want to resize the domain of simulation created in the RESTART FILE. Is there any solution for this case ?

Thanks,

Regards,

Hello everyone,

I am looking for opinions or insights on the capabilities of LIGGGHTS to model fine particles/powders. Has anyone developed or worked with models involving the phenomena (cohesion, van der waals, etc) that arises from considering fine particles?

Any comments on this topic will be of help since I am no expert on the subject.

Thanks,
Eng. Nicolas Alderete

Can LIGGGHTS run on any cloud service such as Amazon EC2?