CFDEM®coupling - User Forum

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!

Hi there,

I am trying to reproduce the CU triaxial test with CFDEM. There are two problems I am facing with. First, when the specimen undergoes axial compression, the specimen becomes deformed, that means the CFD mesh should change dynamically. Boundary in this case is not fixed. Second, the servo wall in liggghts dose not recognize the pressure from the pore fluid, which means I cant keep the cell pressure stable like the indoor experiments.
Can anyone give me some suggestions? Thanks a lot.