CFDEM®coupling - User Forum

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,

Hello,
I have problems with controling write interval of restart file during the simulation, I set a writeLiggghtsProps to write a restart file every cfd write step. The first restart file is created at writeIterval, however, after that there is created another restart file every single CFD time step.

Hi

I am using solverIB for getting pressure drop and velocity distribution in a packed bed. I have found that the pressure drop and velocity magnitude keeps on increasing as i decrease the cfd timestep. The pressure drop varies from 250 Pa to 10000 Pa as i vary cfd timestep from 10^-4s to 10^-7s. The analytical pressure drop is around 400 Pa. I have adjusted coupling interval accordingly when i vary cfd timestep.

I have found similar queries in the forum but no solution yet. Can somebody help me?

Thanking You
Baju C Joy

Hey Guys,

anyone else came across something like this:
By coincidence I changed the order of the force models in my Coupling Properties file. And even if the difference in the results of both simulations were not significant, there were some (compare Picture 1 and 2 - both were taken after the exact same time in the exact same setup (except the order of the force models))

Hello everyone, I try to do a triaxial test on a soil specimen. When I try to use the servo walls to apply the confining stress on the specimen, a question arises. As the soil is saturated, is the stress on the servo walls total stress or the effective stress? Thank you very much!

Best wishes,
Jack