CFD and DEM - General Discussion

I have created a particle growth simulation in LIGGGHTS using fix command:
fix ID group-ID insert/pack seed seed_value distributiontemplate dist-ID general_keywords general_values pack_keywords pack_values ...

I want to shrink the same particle. The growth that has already happened, I want to undo the process overtime again.

I don't understand how to proceed it.

Hello,

We are a very small french research team. And we plane to study the processus of additive manufacturing. The first step is to model the flow of particles on the system. We encounter a few difficulties to understand the behaviour of the software, the underlying physics and we would like to found a easy step by step tutorial and caracteristics examples.

Could you give us some advices to find such sort of documentations and code examples?

Thanks so much,

Sébastien Nadler
R&D projects Leader, Astek society, France

Can someone help me with errors I get whenever I try to open links on forum pages? It always says "Page not found, the requested page could not be found"

Hi All,
I am trying to simulate normal particle flow falling freely from hopper. I have read some articles on bin size or skin value. There is still some confusion I have. What is the optimal size of bin or skin? I read somewhere that the bin size of about ~ 4 times the particle radius would be fine. Does bin size affect the final solution?

Hello,
I am using aspherix for the simulation of particles inside cylinder-press mechanism to understand particle behavior under certain condition. however, I am facing problem to get resistance from the particles.

Hello all!!

I want to give a Coulomb sliding friction only between the ground and particle (i.e. no friction between two particles).

Does anyone know how to do that?

Please reply as soon as you can, it'll be much appreciated.

Thanks and regards.

Hello all!!

Below is the error that I'm getting, when trying to run my simulation in liggghts.

ERROR on proc 0: Fix nve/sphere requires extended particles (/build/liggghts-QCz4in/liggghts-3.3.1+repack1/src/fix_nve_sphere.cpp:132)
--------------------------------------------------------------------------
MPI_ABORT was invoked on rank 0 in communicator MPI_COMM_WORLD
with errorcode 1.

Hi guys
I'm a beginner in DEM; could I model any 1D continuous object with DEM (I mean a line element that makes by compounding some non-spherical particles)?
Is there any need for an Intermediary method (like IBM or ELA) to simulate?

Hello,
I am trying to run a simulation where particles released freely from a height of 700 µm, due to gravitational and contact forces, these released powders freely deposited into the box and formed a powder bed. A roller is then applied to spread a 50 µm high layer of metal particles.
Can anyone share a code for that ? With which tutorials I can start or modify it or which command I should use ?
I am actually a total beginner. I would be glad if anyone can help through with the steps involved in the simulation.
thnx.

Hi,
I would be grateful if someone can help with material about DEM - electrostatic simulations using LIGGGTHS (tutorials, examples, code). I found this example: https://www.cfdem.com/electrostatics. I am new in LIGGGTHS, I will appreciate any kind of help.