CFDEM®coupling - User Forum

Hello everyone!

I hope someone can answer this simple question...

Scenario: Pipe (with a grid stl file at the outlet) is filled with particles. I run water through the inlet side and I would like to count the number of particles that pass the grid due to the fluid.

I tried the massflow/mesh without coupling and it worked well. However, I wanted to know if this works when coupled to a scenario I mentioned above. I am thinking that it should just count them without any issues but I know some things in liggghts don't work with cfdem coupling.

Hi everyone,

I would like to get a better intuition about alphaMin parameter in coupling properties. what does it do exactly and what is its effect with fine mesh. I mean should we decrease or increase it while we are using a fine mesh?

kind regards,

Arghavan

Hello!

I have been struggling a lot lately with the compilation of CFDEM-Coupling which seems to be super non-trivial. I am unable to run any tutorials.

Hello!

I am wondering whether or not I have installed CFDEM coupling properly. The screenshot of compilation process is attached
I tried to run few CFDEM tutorials, they simulate until some point and that are not able to generate some png files. Forums say that this might be related to the compilation of OpenFOAM

I am using Ubuntu 20.04 and also attaching the OpenFOAM compilation error text. It throws an error and I am not able to run any OpenFOAM tutorials. I've been thinking to go back to 18.04 and try it there.

Best regards,
Azamat

Hello Team,

Greetings. I'm hereby attaching an image which is the pressure drop across the fluidized bed versus inlet velocity for three different cell sizes in CFD setup (rest all parameters remaining constant). Particle diameter is 1.2mm and idea is to find minimum fluidization velocity. All meshes generated by blockMesh.

Hello!

I am am trying to install CFDEM on a CentOS cluster. I keep getting the following error when I try to compile using cfdemCompCFDEMall:

Hello!

I am trying to use servo walls in order to apply a constant confining force on some particles. The force is not so large, only about 2-5N. I am using periodic boundaries for the compressed particles but since I do not my confining mesh in the x and y directions I guess its ok (right?). I should also mention that between mesh and the flowing particles is a single layer of a particle lattice which is rigidly bonded.

Hello!

I am trying to simulate a shear flow where a wall made of particles shear a granular body while being completely submerged in fluid (via CFDEM). To bypass the use of servo walls, I just set the total weight of the particle wall to be several times the flowing body. I use Archimedes+DiFelice for my fluid forces. I set the fluid forces to act only on the flowing particle body so that the bouyant forces will not affect my particle wall in such a way that I can keep the weight of the said wall constant even if I change my fluid densities.

Dear Friends
I'm trying to understand how to setup my case. I'm working with cfdemSolverPisoScalar solver and I have reviewed the initialization files "in.liggghts_init" & "in.liggghts_run".
In my understanding "in.liggghts_init" initialize DEM solver and "in.liggghts_run" do the coupling with CFD solver, however, some of the data in these files doesn't match.

Greeting,

I am very new to CFDEM and OpenFOAM in general and just about looking to simulate a fluidized bed combustor.

I looked around in this forum and found that ErgunTestMPI is a fluidised bed, so i wanted to run this file and start modifying it to fit my model. However, I promptly ran into the following problem as I attempted to run the simulation: