CFDEM®coupling - User Forum

Hi

A professor at my university has brought to my attention that if the momentum transfer term, involving Ksl, is computed as occupying an entire single cell, in which a particle is located i.e. for an unresolved case (particle << cells), this could lead to significant flow evolution errors with simulation time. Is this concern valid? And what additional flags or options are required use to produce best flow modulation results.

Also is this concern also valid (if valid at all) for dilute systems?

Thanks

Hi,
I used OF and LAMMPS before, but I am quite new to LIGGGHTS and the CFDEM coupling.
I successfully compiled OF and ParaView and configures the paths.
The system test and the LIGGGHTS compillations seem to work fine, but I cannot get the CFDEM-couling compilled.
Below a more detailed description of the error messages. Any help and hints are appreciated.

Thanks a lot
hansjoerg

While compiling CFDEM 2.5.1, there are many error info when comes to "compile solvers"

---> mkdir: cannot create directory `': No such file or directory......

I simulate the bubbles move up in the water where bubbles are regarded as the discrete phase. In the default solver, the p field is not include gravity effect. Now I add gravity effect in the p formulation and compile the solver. When I run the simulation wihout drag force, I think the gradP force works fine, but if I add the drag force, bubbles don't move up and their movement become out of order. I don't kown what is wrong with it, It's the solver problem or wrong initial conditions or any other problem?anther problem is that some bubbles can cross the draft tube wall.

Hello CFDEM Users,

I tried to install CFDEM on Ubuntu machine. After installing, I didn't manage to run the tutorials. So, I tried to run the following example :
~/CFDEM/CFDEMcoupling-PUBLIC-2.1.0/tutorials/cfdemSolverPiso/settlingTestMPI/CFD

using the command :
mpirun -np 2 cfdemSolverPiso -parallel

and I found the follwoing error :

--> FOAM FATAL ERROR:
bool IPstream::init(int& argc, char**& argv) : attempt to run parallel on 1 processor

Hi everyone,

I am just coming back with a new equiry on CFDEM coupling.

Hi,

I am trying to update from CFDEM 2.4.4 to CFDEM 2.5.0, but I get error while compiling cfdemSolverIB as shown below. I think some library is missing in ../cfdemSolverIB/Make/options. Any ideas? Version 2.4.4 had compiled fine. I have attached the log file.

Hello everyone,
I am trying to install CFDEM followed by the githubAccess_Public.pdf. It all runs fine. The "cfdemSysTest" also shows no errors. However, when I compiled "cfdemCompLIG", then the computer goes dead. Is there anyone meet this situation and knowing how to modify it? Thanks.

when I simulate the bubbles move up in the water, the gradp forcemodel does not work fine. The bubbles' velocity is too big, though the drag forcemodel is included. Another problem is bubbles. may fall down in the end of the iteration.

the gradp forcemodel can be weather used to simulate the buoyant effect?

Hi,

1. I was able to install cfdem packages along with LIGGGHTS and OpenFOAM 2.1.x. I had no issues during the installation.

2. I was able to run the cfdemSolverIB tutorial. However, I had the following errors running the EurgentestMPI.

Reading momentum exchange field Ksl

Reading voidfraction field voidfraction = (Vgas/Vparticle)

Creating dummy density field rho

Reading particle velocity field Us

Reading/calculating face flux field phi