CFDEM®coupling - User Forum

hi everyone
i'm new to CFDEM and run my own case that use air as fluid and everything is okay after that i changed my fluid to water(without change anything else) and after i run the simulation , the result is unstable and it's look like to need change some parameter
fluid velocity=particle velocity=0.05m/s laminar dem time step=0.00001 cfd time step=0.0001 and if need more information i will share it
if you have some experience please share it with me
thanks
best regards

Dear everyone:

I am the new beginner of CFDEM. In the past years, I used the EDEM software for my study. Recently, I considered to transfer to the open-sourced software.

However, when I followed the instructions on the website to compile the CFDEM, the error message reported as followings:

'' compilation terminated.
/home/huqimeng/OpenFOAM/OpenFOAM-5.x/wmake/rules/General/transform:25: recipe for target 'Make/linux64GccDPInt320pt/fdemParticle/cfdemCloud/cfdemCloud.o' failed''

Hello,

I faced a problem when running the CFDEM coupling: my particles disappear after leaving the insertion volume. My geometry is a simple rectangle, and I wrote the LIGGGHTS code such that particles are continuously inserted from one face of the rectangle. When I run the LIGGGHTS code alone, no problems occur, and the particles do not disappear after leaving the insertion volume. However, when I run the CFDEM coupling, the inserted particles disappear after leaving the insertion volume. I would be grateful if you could provide any advice on how to solve this problem.

I am developing a solver to simulate particle resuspension. The particles are initially deposited on a wall and then exposed to a flow field. I wish to calculate a coefficient x for each particle as a criterion. This coefficient needs to use the fluid velocity at the particle. I have tried to declare and define the variable x in my atom.h and atom.c solver files, how should I call the fluid velocity at the particle location at each time step?

I need to update this coefficient x in a time loop and return it to the liggghts, does anyone have a good suggestion? Thanks

Hello, everyone:
I have a question about CFDEM . In the DEM folder, it has two in.liggghts txt - init and run script. I do not know what is the function of the "run" script, cause I find that in parDEM.sh, it seems that it only use in.liggghts_init . How to use the run script? I am so confused.

Hello everyone,

I reconstruct my simulation case with the following command

reconstructPar -noLargangian

The problem is if I don't use "-noLargrangian", I always get the following error

Reconstructing fields for mesh region0

Time = 3

Reconstructing FV fields

Reconstructing volScalarFields

Hello, everyone! I am trying to compile the full CFDEM-PFM, and I have successfully installed OpenFOAM-6 and the corresponding version of paraview.
When I type cfdemSysTest into the terminal, it shows no problem.
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Hello,

I keep getting a segmentation fault when I start approaching 40 cells / diameter. Under 30 cells / diameter is fine, and I have this issue both on my laptop and the cluster at my univesity. I'm running this with cfdem-pfm, though I recall having what initially appeared to be the same problem with cfdem-public. I've narrowed down the issue to the buildLabelHashSet function in IBvoidfraction.C. To determine this, I put an info warning around when it's called:

Hello everyone,

I am trying to install CFDEMcoupling on Fedora Linux.

Generally I am following the installation of CFDEMcoupling from :https://www.cfdem.com/media/CFDEM/docu/CFDEMcoupling_Manual.html

For now the good thing is that I have downloaded all software and compiled OpenFOAM successfully, so the only work is the last step to compile LIGGGHTS® and CFDEM®coupling with ‘cfdemCompCFDEMall’ command. However the problem occurs.

Hi everyone,

I'm a new user to LIGGGHTS, and I'm having a tough time creating a simple simulation.

I want to create a simulation where a single particle (metal particle) falling from air and another simulation where a single particle is falling in viscous medium (like a resin).
When a particle falls in air, it'd just have a gravity force acting downwards on a particle.
When a particle falls in a viscous medium, it'd have a drag force acting on the system. So, how can I add drag force acting on the particle