CFDEM®coupling - User Forum

Hello everyone,

I’m currently working on a simulation using the multiphaseInterFoam solver (specifically, the PFM version cfdemSolvermultiphase from the tutorials). My goal is to model fluid injection into a porous medium with particles, but I’m encountering some issues with pressure stability. The simulation often shows negative pressures and other unstable pressure fluctuations.

I’d appreciate any suggestions or troubleshooting tips on resolving these pressure issues.

Hi,
I am new to CFDEM and am trying to use it to simulate particles for a 3D printer. The paper I am trying to replicate uses Fluent for DPM concentration in kg/m3. So, far I understand,

DPM concentration= Total particle mass in a cell/Cell volume

I am trying to achieve the same using CFDEM. I cannot find a way to do that in Paraview. Specially how do I get mass per unit cell and the unit cell volume. Can you help me?

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Hi everyone i want to simulate something with this information. but I don't know how could the condition is same for gas and oil and I just can simulate gas and when use oil , the simulation isn't stable and it's look like the particle dispersed and spin in oil
if anybody have any solution please help me
best regards

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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