CFDEM®coupling - User Forum

Hi,

When I run the tutorial case, cfdemSolverPiso/periodicChannel, I received the following errors.

May I ask how to solve this issue please?

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CFDEMcoupling version: cfdem-3.8.1
, compatible to LIGGGHTS version: 3.8.0
, compatible to OF version and build: 5.x-commit-538044ac05c4672b37c7df607dca1116fa88df88

You are currently using:
OF version: 5.x
OF build: 5.x-538044ac05c4
CFDEM build: 3.8.0-3-gb237264-dirty

I'm writing the command: write_dump all mesh/vtk post/meshfile*.vtk stress vel stresscomponents area

This command worked in previous versions when it was mesh/gran/VTK and I've corrected it to mesh/vtk, but I'm still getting errors with this command that are indicating the keywords are wrong. What is the correct way to do this in version 3.8?

Hello!

I am trying to simulate a tunnel with 4 spheres but one of these spheres comes out of one of the walls of the STL (it does not bounce)
The file is not recognizing my domain as a wall.

Any help would be appreciated

The configuration of the dictionary of the spheres is as follows:
*****************************
echo both
log ../DEM/log.liggghts
thermo_log ../DEM/post/thermo.txt

atom_style granular
atom_modify map array
communicate single vel yes

Dear All

Hey!

I have rewritten the smagorinsky turbulence model to create a sub-grid voidfraction dependent viscosity of the Batchelor-Green viscosity:

https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/artic...

Hello All

I am writing in hope if some one can help me in solving the problem. I want to restart my cfdem simulation from last time step. Due to time limit on cluster, the simulation did not finish till specified time (e.g.3 sec). I am following the same procedure as done in tutorial case ErgunTestMPI_restart. Here is in brief what I do:

Hi all

I am attempting to simulate an unresolved coupled CFDDEM channel flow of particles using a fixed particle boundary for the walls instead of a meshed boundary. Currently I am running into an issue when using the READ_DATA command to bring in the wall particles, I have set the wall particles as type 2, and my flowing particles as type 1.

Hello all,
Is it possible to introduce two different liquid bridge forces in one simulation? As I see, for "easo/capillary/viscous" model, one can only use one liquid property for a simulation. How to use two liquid properties for two different class of particles?

Thanks in advance.

Hello,
Are there any known working Liggghts + OpenFoam containers out there on Docker Hub or elsewhere? I would like to use a container for testing out the solution as opposed to investing time in source compiles.

Thanks!
William

Hello all,

I am working on CFD-DEM coupling simulations with our in-house coupling solver, and we recently face a tricky technical problem. The problem is that our coupling simulation stops randomly without any errors when run the simulations in parallel.

In order to fix the problem, I have tried the following ways:

1. try to run the same simulations on three different machines (2 local workstations and one HPC cluster), however, all of them stop without any errors.

2. try to use different methods to decompose the computational domain, but still failed.