CFDEM®coupling - User Forum

Dear CFDEM enthusiasts,

I am currently running a simulation using the IB solver and I am experiencing very high computation times. Does anybody have experience in using this solver and can maybe tell me if this are usual computing times or if I am doing something wrong?

The simulation is running on 4 cores while the Computer posseses 128 GB of RAM. Around 400 particles are in the system but for 50 particles the simulation does not seem to run faster. I am using 4 cells per particle diameter.

Hi,
i meet one problem,for single particle settlement in water. The dragforce output from the program and the dragforce calculated using the final settlement velocity and Defelice theoretical equation are a little different. does anyone know the error (about2%) come from?
thanks a lot.

Hi,
i'm trying to compile CFDEM coupling, after having followed a tutorial found here. I successfully installed OpenFoam 3.0.x and the right LIGGGHTS version. But when i run the command cfdemCompCFDEM to compile CFDEMcoupling, i get this
NB it is just the first lines, but i think that here it is the problem!
Probably, CFDEMcoupling can't see OpenFoam, but it doesn't give me the error when i start the new terminal!

Thank you very much for helping,
Matteo

Hi,
I'm trying to install CFDEM 3.6.1 on a Red Hat linux V6.5, but I receive an error
collect2: error: ld returned 1 exit status
which I cannot figure what it actually means. I've also attached the cfdemSysTest and foamInstallationTest in case it helps.

I would greatly appreciate the help.
Best
Ali

Hello, I am sorry if it is obvious but I cannot find an answer. I want to run a simulation in which DEM particles feel fluid but fluid do not feel the particles, is that possible? how should I do? I want something like this "One-way coupled simulation of particles flowing into water basin" (http://www.cfdem.com/more-examples) but I cannot find how to implement this. I am using cfdemSolverIB . Thank you very much in advance.

Best regards,
Paula

Is there a 'gravity term' in the default 'cfdemSolverPiso'?
Although there is a 'g' file in the ..../CFD/constant/, but it actually not used in the 'cfdemSolverPiso' algorithm
(I found the command of header file (#include readGravitationalAcceralation.H), but the term 'g' is not actually used.)

Thanks for reading my question : )

BC

Hi, all

I just simulate a paked bed, 7000 particles were paked in a cylinder. But I did not get a convergency solution, especially the pressure. The Figure of residual is in attachment. The FvSolution are presented. someone can help me?

I try to run a simullation, before install LIGGGHTS. But can't find a file.vtk to open in ParaView. Any one can help?

Who has a step by step installation of Liggghts?

I do:
cfdemSysTest

and all are Valid: Yes.

When I will compile LIGGGHTS(R) make:
sudo make clean-all (in /src dir.)

And do: cfdemCompLIG

OBS: some words are in Portuguese.

The terminal show me:

copying patch files for LIGGGHTS if available
cp: impossível obter estado de '/home/cae/CFDEM/CFDEMcoupling-PUBLIC-3.0.x/src/LIGGGHTSpatch/*': Arquivo ou diretório não encontrado

Hi all,
I have a simulation that requires a lot of Ram memory, and when the simulation uses the swap, my computer gets very slow. Do you have a way to limit the use of RAM and make the solver run the analysis in the floopy disk?
Thank you for help!