CFDEM®coupling - User Forum

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:

Hello! I am really confused, I am running a really simple simulation , a square box filled with particles (that can't leave the box), inlet in a lateral wall, outlet on the opposite wall.
I am interested in to measure the difference of pressure between inlet and outlet walls.
Things work well, but if I change the coupling time-step from 100 to 10 (and the OF time-step accordingly) the pressure just increases crazily (almost 5 times) and the particles inside the square box start to be compressed against the outlet wall.

Hi all,

I tried to install openfoam, liggghts and cfdemcoupling according to
"https://www.evernote.com/shard/s214/sh/0ec74d17-2173-4c6e-a156-6c8cbe418..."

when i type cfdemSysTest, it showd

Dear all

Hi,
I would like to know how to get the void-fraction value of different CFD cells.
I tried using fill cylinder tutorial as reference but its not executing successfully .
I can managed to get the value through probes at different points but would like to get the paraview plot at all cfd cells with fix particles at different positions.
Is it possible to get the solutions in VKT form in CFD cells like folder 0 similar to OpenFoam?

Please help.

Hi everyone,

version 3.6.1 is now available on github. It is a fix for the cfdemPostProc tool and the oneWayVTK dataExchangeModel.
Everything else is untouched.

Happy simulations and Cheers,
Josef

Hi,
When running the periodic channel tutorial I encounter some issues which sounds quite peculiar. I’ve attached the complete log file but here just point out the issues:

1) On line 277 of the log, it’s written
--> FOAM Warning : Periodic handing is disabled because the domain is not fully periodic!
How can this be!!!