CFDEM®coupling - User Forum

Hi All,

I have set up a coupled CFD+DEM simulation to study the particles temperature drop by the cold wind. The initial particle temperature is 393K, the initial wind temperature is 293K. However, after 1800s, the lowest particle temperature is 248K (-25C) and highest temperature is 549K (275C). For the whole system at initial, the highest temperature is 393K and lowest temperature is 293K. It seems unreasonable for the particle temperature drop or increase so much. Could anyone please discuss about the possible reasons for that?

Thanks!

Kun

Dear all

Openfoam 2.3.0 has been issued, and it has DPM method.

Does anyone has the experience of the comparision of DPM and DEM? It looks DPM also considers the collision between particles but in a "global" way, which allows the huge number of particles.

Does anyone has comments ont that?

http://www.openfoam.org/version2.3.0/dpm.php

Hello

I'm trying to compile CFDEM. The compilation of OpenFoam was sucesscfull, and now I turn to compile LIGGGHTS.
I followed the instructions in githubaccess_public.pdf.

The test was sucessful. Executing cfdemSysTest results in:

*******************
system settings:
*******************
CFDEM_VERSION=PUBLIC
couple to OF_VERSION=2.3.0
compile option=Opt

Can the CFDEM be coupled with OpenFOAM-2.3.x? I am now installing OoenFOAM-2.3.x but I am wondering if I could get an answer before installation is done.

Thanks,
FNK

Dear CFDEM/LIGGGHTS developers,

I read the dipl. thesis of JUK on the VOF method in CFDEM. I have a question about the modified VOF method, espeically the source term at the RHS.

latex:

\begin{equation}
\frac{\partial \alpha_1}{\partial t} + \nabla \cdot (\alpha_1 \alpha_f u_f) - \nabla \cdot (\alpha_1 (1-\alpha_1) u_{ra}) = - \alpha_1 \frac{\partial \alpha_1}{\partial t}
\end{equation}

Hi,

I am seeking help with the installation of CFDEM. Specifically, on a failed compilation attempt I receive the output that follows.

Can someone please shed some light on this issue?

Regards,
Chris Blyton

// log_compileCFDEMcoupling_cfdemSolverIB_cfdemSolverIB-2014-04-07-16:29 //

/home/chris/CFDEM/CFDEMcoupling-PUBLIC-2.2.x/applications/solvers/cfdemSolverIB

Hi,

I set up a coupled simulation where particles are conveyed within an air stream into a container. After a while I want to unfix the bottom of the container to empty.
Within a DEM simulation I would do it with a "run xxx upto" command and than a "unfix" command. But according my understanding in a coupled simulation (CFDEM) there is always one timestep ("run 1") executed. How can I execute a unfix command after a specific time? Is it possible with a liggghtscommand within the CFD/constant folder?

Thanks for Help,

Urs

Hi Everybody,

I was wondering if you know which versions of OpenFoam and Liggghts works fine during CFDEM compilation?

Regards,,

David

Hi

I work on my first coupling Project. I want to simulate a filter Receiver which separates the air from the conveyed material. The simulation I set up on the Ergun example. I use the same patches as in the example (inlet, outlet, wall). The problem is that always after a while the CFD solver crashes.

Dear all,