CFDEM®coupling - User Forum

Hi

I work on my first coupling Project. I want to simulate a filter Receiver which separates the air from the conveyed material. The simulation I set up on the Ergun example. I use the same patches as in the example (inlet, outlet, wall). The problem is that always after a while the CFD solver crashes.

Dear all,

I had taken a break from the CFD-DEM until this last week. I installed the latest version of LIGGGHTS and CFDEMCOUPLING and when I run my (updated) input scripts, I get crazy errors when I from temperature on any walls. The first try was with primitive Hertzian walls. I tried again with a mesh and still got errors that kill the simulation.

Dear all,

I am trying to compile OpenFOAM-2.1.x with LIGGGHTS 2.3.6 under CFDEMcoupling-PUBLIC-2.1.x in ubuntu 10.04 LTS (Lucid).
Both OpenFOAM and LIGGGHTS are running fine individually and the cfdemCompLIG command was done. But something went wrong when I tried to do the cfdemCompCFDEM command. Here are the error messages when compiling the solver:

Hi everyone,

A simple question.
Is gravity term of fluid included in cfdemSolverPiso?
Thanks.

Fengxian

Hello CFDEMers,

I have made an attempt to create a new solver based on cfdemSolverPiso. The idea is to include a simple convection diffusion equation of a scalar "W" in this case. The equation added to the new solver, called cfdemSolverPisoMT, looks as follows:

turbulence->correct();

fvScalarMatrix WEqn
(
fvm::ddt(W)
+ fvm::div(phi, W)
- fvm::laplacian(Di, W)
);

WEqn.solve();

runTime.write();

Hi,

I have recenely installed OF2.1.1,LIGGGHTS-PUBLIC 3.0.0 and cfdem-2.6.1
following the instruction on the CFDEM project website. I didn't see any
error during the installation but I am getting error when I try to run the test examples
using cfdemTestTUT or Allrun.sh from the directories. So far, I was able to run
the SettlingTestMPI example only but I get error from the other examples.

Helloeveryone,
There is an error for my test during coupling stage as follows,
[0] --> FOAM FATAL ERROR:
[0] [1]
[1]
[1] --> FOAM FATAL ERROR:
[1] incompatible dimensions for operation
[U[1 -2 -2 0 0 0 0] ] + [U[0 1 -2 0 0 0 0] ]
[1]
[1] From function checkMethod(const fvMatrix&, const fvMatrix&)
[1] in file /opt/openfoam211/src/finiteVolume/lnInclude/fvMatrix.C at line incompatible dimensions for operation
[U[1 -2 -2 0 0 0 0] ] + [U[0 1 -2 0 0 0 0] ]
[0]

What is this? (screenshot) Is it spam? It's a bunch of random categories with no posts. And the overlap with the right-hand column is strange too.
This needs to be cleaned up.

Hello everyone,

Is there any command could use to add or decrease fluid in some region during the simulation? I saw there is a file named setFields. I have changed the region in the file , however, the pressure does not change for the changing of hydrostatic pressure related to fluid head. Is there something wrong used for calculating hydrostatic pressure?
Thanks,
shokeyi