CFDEM®coupling - User Forum

Dear All,

with your great help I developed a ring shear test and it works quite well. Thanks again for your help.

I have installed gcc4.7.0, openmpi-1.6.5 and LIGGGGHTS-3.1.0, OpenFOAM-2.3.1, CFDEM-2.3.1. When I test under OpenFOAM and under LIGGGHTS, it works well. However, when I want to test ErgunTestMPI under CFDEM, some errors occur like below:

Create time
Create mesh for time = 0
Reading field p

Reading physical velocity field U
Note: only if voidfraction at boundary is 1, U is superficial velocity!!!

Reading momentum exchange field Ksl

Reading voidfraction field voidfraction = (Vgas/Vparticle)

Creating dummy density field rho

Hi all users,
I am simulating coupling of particles and water. Pore water pressure is an important item. Does anybody know how to calculate and output pore water pressure? Hope someone could give me a clue.
Thanks!

Best regards,
xiaobaishu

Dear CFDEM users,
I want to make sure that I take buoyant force into consideration in my CFDEM simualtion. So if I put gradPforce on, do I need to use Archemedes model? Any help is appreciated!
Thanks

xiaobaishu

Hello there, i'm a new user in CFDEM software and i'm having some issues with the compilation.

I'm trying to couple an Liggghts simulation based on the Continuous Blending Mixer Tutorial, with an CFD OpenFoam Simulation.
Because of the distanz between the two screws (< 2r), it is problematic to implement the rotation of the of the screws with dynamicMeshing in OpenFoam.
It might be possible, to solve this problem with Immersed Boundary Methodes (IBM) in OpenFoam. That means the two screws-STL-Files are implementated as boundrycondtition. That way, it is possible to use the same mesh with out changing it.

Hi all
I'm simulating the sediment transport by cfdemSolverInterFoam that I wrote. But I did not succeed yet!
I run a simple channel with a particle box with using this solver. The velocity increased in beginning and end of particle box and the direction of vectors was abnormal(please see the figures in attachments)!
I don't know its reason!

Looking forward to your ideas,
Thanks
Elham

I found that when we use parallel, in the locate model, it will call for the member function in OpenFOAM-findcells(), it will always return -1, because OpenFOAM only try to search in the first processor. Does anybody met this problem? How do you fix this problem?

Thank you!

Dear all,
I am a new comer in CFDEM, recently I just used CFDEM to simulate the suspended sediment transport, but I always get some particles' velocity larger than the fluid velocity, it that because the time step of DEM side, or I use a wrong model? And in most of time, how can we decide the time step of the DEM side?
Thank you for your help!
Best Wishes!

my couplingProperties is:

ModelType B; // A or B

couplingInterval 10;//CFD timestep 0.0001, DEM timestep 0.00001

voidFractionModel divided;//centre;//bigParticle;//

Dear all,