CFDEM®coupling - User Forum

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.

Hello,

I was wondering how best to prepare for the upcoming CFDEM training. What kind of material would be good to know to make it easier to follow through the training?

Hello,
I'm trying to run a simulation with OF 3.0.0 and LIGGGHTS 3.6.0 and CFDEM 3.6.0. The fluid mesh was created by the snappyHexMesh-tool. After a few timesteps I end up with an error, which is shown below. I'm using the snappyHex-Mesh-Tool for the first time. Is it possible that my mesh has a bad quality or is the cfdemSolverPiso not compatible with a mesh created by snappyHexMesh?

Hi there,

I am a newbie of CFDEM. Although I have successfully installed the latest CFDEM on my PC with Ubuntu 16.04, I still cannot install it on our university hpc with centos 6.5. I used gcc-4.9.3 and binutils-2.25.1. The log file of cfdemCompCFDEM shows the following error: