CFDEM®coupling - User Forum

Hi,
I am trying to simulate the incompressible flow of water through a cylinder.The cylinder at its base have many small circular openings.I have made the mesh of required geometry through gmesh.But while executing the file in OpenFoam the courant number is becoming high.My pressure and velocity fields are as follows:

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |

Hi Christoph,

I was just wondering, is the example "test case: partly fluidized bed" included in the CFDEM tutorial folder? so that i could check the first impression of CFD-DEM coupling?

with kind regards,

David Long

Hi Friends,

Can any one please tell me the procedure to install LIGGGHTS and CFDEM in ubuntu CAE-linux-2011 ..
From past couple of days i am struggling to install this ... Please help me out of this problem..

Thanks in advance .

Best Regards,

Ravi

Dear CFDEM users,
I am using the CFDEM 2.3 and have been bothered with "Segmentation fault" errors these days. I have done a few cases using this version and it worked fine, at lest no strange errors. But recently I set up a case almost the same with the other one except for the drag force, and the "Segmentation fault" error emerged along. The case will "cash" or stop at somewhere around 0.2s whaterver I change the settings, and the output is like this:

Time = 0.17394

Courant Number mean: 0.0454717 max: 1.05449
- evolve()
Starting up LIGGGHTS
Executing command: 'run 10 '

Hi

I was wondering what the difference is between "resolved" and "unresolved" CFD-DEM? If I am correct, the solver "cfdemSolverIB" uses resolved CFD-DEM with the "immersed boundary" method.

One obvious benefit is that a finer CFD mesh can be used (smaller than the particle). This would give more accurate flow calculations, but with greater computational expense I am guessing. Is there extra computational expense, other than the extra CFD cells?

Hello,

Thanks for the new CFDEM release.
Is there a new way of running CFDEM 2.4.0 cases?
I tried to run the tutorial "ErgunTestMPI" with "mpirun -np 2 cfdemSolverPiso -parallel" but it fails due to an openmpi error:
=====================================================
--------------------------------------------------------------------------
It looks like MPI_INIT failed for some reason; your parallel process is
likely to abort. There are many reasons that a parallel process can
fail during MPI_INIT; some of which are due to configuration or environment

hello
thx for the newest version of cfdem.!!
Everything is ok except for the cfdemPostCalc.
it seems that the createFields.H is missing in the application/utilities/cfdemPostCalc..
after I copy a file from solvers/cfdemSolverPiso, everything goes somothly.
thx.
s.l

Dear guys, it seems that the LB codes were designed for FLUENT ???
node/405
I'm a freashman in CFDEM. Is any step-by-step tutorial to implement LB simulation?

Thank you very much!

Hi,
I am compiling CFDEM 2 and LIGGGHTS 1.5 on my UBUNTU machine.
In compiling src (for CFDEM), after I enter wmake libso, an error comes up that shows that it can’t find certain *.h files.

I searched for fvcfd.h and I found it somewhere in OpenFOAM/OpenFOAM-1.7.x folder. I manually copied it into LIGGGHTS src folder and re-compiled, this time it complains about another file (parrun.h) that it can’t find.

Hi all,

While installing the coupling, i get the following message-
( i have pasted the last few lines )

subModels/dataExchangeModel/twoWayMPI/twoWayMPI.C: In constructor ‘Foam::twoWayMPI::twoWayMPI(const Foam::dictionary&, Foam::cfdemCloud&)’:
subModels/dataExchangeModel/twoWayMPI/twoWayMPI.C:69:19: warning: use of old-style cast [-Wold-style-cast]
subModels/dataExchangeModel/twoWayMPI/twoWayMPI.C:69:19: warning: use of old-style cast [-Wold-style-cast]
subModels/dataExchangeModel/twoWayMPI/twoWayMPI.C:70:19: warning: use of old-style cast [-Wold-style-cast]