CFDEM®coupling - User Forum

Hi,

I have problems compiling CFDEM. The solution to a similar problem (http://www.cfdem.com/forums/update-cfdem-251-compile-error) did not help.
The first error of this kind happens at the end of the submodel compilation.

Hei,

Hi, there

When I ran my own case manually, I encountered errors as follows,
1. can you please check it and help me fix it?
2. CFDEMcoupling allows a multi-phase property definition in OpenFOAM?, e.g., air and water phases?

many thanks in advance!

Yin
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Hi all,

Hi,
recently, i have tried to update my CFDEM to 2.7.1 and LIGGGHTS to 3.0.2 (OF still stay on 2.1.0, which is enough for me)
i noticed some messages during compiling, which i never noticed before.

Hi
when I try ro run CFDEM case, A error happened in the cfdemPostproc case/fillCylinder. Information is below
*** Error in `cfdemPostproc': free(): invalid next size (fast): 0x0c103a70 ***

trying to start paraview...

There is no problem for other cases , any help?

Hello Everybody,

I need to know how to couple time step between liggghts and CFD? I modified deltaT in OpenFoam but I got the error "TS is too big for coupling".

Regards,

Carlos

Hello users:

How does CFDEM calculate particles force on fluid cells?

As I understand , For calculating Drag force on particles we should at first obtain " inter-phase momentum transfer coefficient due to drag" which is shown in Kochhill drag by "betap".

Hi everyone

What is the highest particle volume fraction that runs reliably with CFDEM? Has anyone else had experience with this?

I have been running 20% volume fraction (0.8 voidfraction) quite reliably, but when trying to run 30 or 40%, my simulations become very unstable. I have tried reducing the DEM time step (which is supposed to help) but that only made it worse. Increasing the time step helps a little bit, but I am not sure if this is the most correct thing to do.

Dear community,

I am simulating the packing of a chromatography column at Technical University Munich. Therefore I use CFDEMcoupling 2.7.1, LIGGGHTS 3.0.2 and OpenFOAM 2.3.x. I already built some working small scale models (40.000 particles, 4% of the volume of the fullscale experiment) with a discrete particle distribution based on the Ergun Test Case (reversed flow).