CFDEM®coupling - User Forum

Hello,

I'd like to calculate wall stress and wear by grains with CFDEM, but fix mesh/surface/stress was failed as follows.

Hello,

actually I wanted to modify some geometry in my case. To perform the calcualtion, it is necessary to create a new restart file.
This should be automatically done by Allrun.sh if liggghts.restart does not exist.
But this doesn't happen.
I also tried to run ErgunTestMPI tutorial without liggghts.restart file. This also doesn't work.

Using CFDEM 3.8 and OF 5.x

Running cases with existing restart file is working.

What is the right place to look for?

Hi,

I'm new to UNIX environment and using git commands. I'm trying to figure out how to update/upgrade the old version of CFDEMcoupling using git pull, command.

Can someone confirm me if the following is the approach:
1. In OpenFOAM/OpenFOAM-5.x
git pull
git checkout 538044ac05c4672b37c7df607dca1116fa88df88
./Allwmake

2. In LIGGGHTS/LIGGGHTS-PUBLIC
git pull

Dear colleagues
I have developed a new CFDEM solver, when coupling starts particles begin to vanish from CFD part, I mean Lagrangian particles, that could be loaded to Paraview from particle cloud. When the run ends up, more than half of particles are lost. But from DEM part particles could be seen and there is no problem, no DEM particle have left the domain. What may be the cause of this phenomenon? Any help is appreciated.
Talat,

In
https://www.cfdem.com/media/CFDEM/docu/CFDEMcoupling_Manual.html#id2
you describe the compilation steps as:
cfdemCompLIG
cfdemCompCFDEMsrc
cfdemCompCFDEmsol
cfdenCompCFDEMuti

But third and fourth have typos. Should be:
cfdemCompCFDEMsol
cfdemCompCFDEMuti

Cheers,
Alexis

hello,

I am trying to measure the mass flow rate of a material flowing out of a hopper, but I please need some help.

I drew using a CAD software a 3D plate with a hole having the same diameter of the hopper opening and call it into LIGGGHTS using the fix "mesh/surface", because I want to measure the mass flow rate of the material exiting the whole area of the opening and not only at a single point, and then used the following fix:

fix mflow all massflow/mesh mesh CAD vec_side 0. 0. -1. (for example)

But I am getting the following error:

Hi everyone,

Dear CFDEM & LIGGGTHS developers and guru users,

I’m failing to install correctly CFDEM, although my tests so far are limited to the LIGGGHTS step. And, more specifically, with a problem with VTK and MPI.
I’m installing CFDEM & LIGGGTHS within a container that runs on ubuntu:16.04 with OpenFOAM-4.x already installed in it. The OpenFOAM-4.x was installed with MPICH 3.1.4.

INTRO

In the fluid-particle coupling, is the viscous force the same thing as the lubrication force?

Thank you!

hello,

I am trying to perform a simple flow simulation, but it is not being run because of the following error:

ERROR on proc 0: Too many atom sorting bins (../atom.cpp:1506)

So what are the parameter/s that I should modify to overcome this error, knowing that the time-step is less than 20% of the rayleigh time.
Would it be that I am using a very fine mesh in which the particles are in contact with many mesh elements at each time step?

I hope any may please help me in solving the issue.

best wishes,