CFDEM®coupling - User Forum

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:

Hello,

Hi everybody,
I am working with ArchimedesIb force in cfdemSolverIB, however, it seems that the code is giving me the wrong value. As you can see in the ArchiumedesIB.C and ArchimedesIB::setForce() (Line 113), the buoyancy force is calculating by
force += -g_.value()*forceSubM(0).rhoField()[cellI]*particleCloud_.mesh().V()[cellI]*(1-voidfractions_[cellI]);

Hello,

I would like to simulate a filter that retains most of the particles while allowing water to pass through. I created a case in OpenFoam and it works fine using a porous baffle for the filter. Now I wanted to know how LIGGGHTS will interact with a porous baffle (porousBafflePressureFvPatchField). Is there a boundary condition that I should be focusing on to simulate the scenario mentioned above? Or if anyone can direct me to sources that would be awesome.

Thank you!

Dear folks
I'm new to CFDEM and I'm trying to run a tutorial example of following:
"tutorials/ParScale/cfdemSolverPisoSTM/packedBedTempParScale"
however, after I type "./Allrun.sh" this error shows up:
--------------------------------------------------------------------------
mpirun has detected an attempt to run as root.
Running at root is *strongly* discouraged as any mistake (e.g., in
defining TMPDIR) or bug can result in catastrophic damage to the OS
file system, leaving your system in an unusable state.

Hello there!

My goal is to simulate particle plugging effect in a channel.

What has been achieved so far:
The fluid flow domain is a long trapezoidal or a wedge shaped box (figure attached).
The BCs are no-slip walls, constant inlet velocity, and constant outlet pressure.
A snapshot of one of the particles plugging results is attached, and you can see the particle accumulation.

Dear all,

I'm running the EngunMPI tutorial case on HPC using 40 cores and I detect that the number of cores for DEM and CFD parts the same, but in is not good becouse CFD parts is very sensetive for number of cores. In this situation I wanted to run DEM using 40 cores and CFD -5 cores. Is it possible to run CFDEM in this way?

Best regards, Furkhat