CFDEM®coupling - User Forum

Hello,
can some one say me, which CFD mesh size is recommendable in dependence of the DEM particle size?

I have done it approximately and got 0.02*radius, if some one want to calculate the fluid stream between the particles.
But this mesh size causes quiet a big mesh.

Can some one help me?

Best regards
Robert

Hi all,

I am using liggghts from python. I am wondering if I could use the CFDEM coupling from python?

Best wishes,

Leo

Hello,
I while back, I heard, that CFDEM is compatible with foam extend.
So, I compiled foam extend 3.2 and it worked fine.
Then I changed the file-file and the option-file at CFDEM form OpenFoam to foam,
but every thing I get is an error.
I have read that foam extend is based on OpenFoam 1.6. Therefore I believe,
that every older version of foam extend should have caused the same problems.
I tried to google compiling CFDEM with foam extend, but I did not find anything.
Can some one help me?

Best Regards
RobertG

Dear CFDEM developers,

I am aware that the fluid property in the CFDEM coupling is constant and defined in ../constant/transportProperties.
Is there any possibility for us to make the fluid properties vary during the interaction process with the particle system? For example, the fluid density becomes larger and larger in the flowing process.

Many thanks for your attention.
Best regards,
Moon

Dear all,
I am simulating interaction of particle and fluid using CFDEMSOlverIB, but it stops here:
Time = 0.002
Selected 391658 cells for refinement out of 430289.
Refined from 430289 to 3171895 cells.
Selected 0 split points out of a possible 391658.
Courant Number mean: 92329.5 max: 7.85258e+09
- evolve()
timeStepFraction() = 1
Starting up LIGGGHTS
Step Atoms KinEng rke Volume
Executing command: 'run 100 pre no post no'
Step Atoms KinEng rke Volume
40101 8844 1.328017 0.069717623 0.000132651

Dear all,
I am trying to simulate a sand and water coupling case with the immersed boundary, when i start with CFDEMSolverIB and set momCoupleModels to be off. It tells me:
update Ksl.internalField()
[0] [1]
[1]
[1] --> FOAM FATAL ERROR: [2]
[2]
[2] --> FOAM FATAL ERROR:
[2] the solver calls for impMomSource()
, please set 'momCoupleModel' to type 'implicitCouple'
[2]
[2]
FOAM parallel run aborting

Hello,
I'm trying to start the packedBedTemp tutorial. But all I get is an error. Maybe some one can help me.
I'm peaty new with CFDEM so the many warnings are not saying me anything, but I believe the interesting part may be this one:

// run_parallel_cfdemSolverPisoScalar_packedBedTemp_CFDDEM //

/home/robert/CFDEM/CFDEMcoupling-PUBLIC-2.3.x/tutorials/cfdemSolverPisoScalar/packedBedTemp/CFD

Hello guys,

I have been having troubles to compile CFDEM in m y computer. I have worked with OpenFOAM for a couple of years, so my OF installation is fine. However, compiling CFDEM doesn't work. I don't know if some libraries are not well adressed or something. (My OF version is 2.3.)
When I compile CFDEM I get the next errors:

Could any one help me I did all what I can to get it installed
but I did not succeed

LIGGGHTS works very well
OpenFoam or foam-extend-3.1 very well also

But no way to get CFDEM-Coupling be installed

I'm missing some thing for sure but cant tell

Any help will be great in order to make a decision to continue or drop this and try other things

At the stage where I'm know in trying to understanding the mechanics of LIGGGHTS and OpenFoam interplay

I'm not able to know why I'm having those errors

Hi!

I recently started using CFDEMSolverPiso and I noticed something about the implementation of the fluid pressure gradient.

In gradPForce.C the gradient is calculated explicitly, followed by a cellPoint interpolation to the particle position (if interpolation is turned on), however, this gradient is calculated according to the logic of OpenFOAM (Gauss linear interpolation) which means:

if we have a pressure like this:
0 | 0 | 100 | 0 | 0

we obtain a gradient like this:
0 | 50 | 0 | -50 | 0