CFDEM®coupling - User Forum

My IE explorer cannot display the whole captcha image, I cannot reply, so I create a new topic. The following files are the log file and the in.meshGran file. During the cfdemcoupling, the atoms number became 0. But it works fine in the liggghts.

I tried to use the insert/steam or insert/pack command to make the particle inject into the reactor by a certain velocity continuously, so I write these commands in the in.XXX file:

Hi,

I'm beginner in CFDEM. I've runned SttlingTestMPI tutorial and dranw the numerical and analytical velocities using the routine in octave. The results seem ok but when the particle reaches the terminal velocity, the velocity slightly oscilates. I think the oscilations are caused by the transition of the particle from one cell to the other. Theoretically, as shown by the analytical results the velocity should be constant. Is there any possibility to improve the numerical results to reach a constant velocity?. I add the file generated by Octave in eps.

Hi,

I have encountered a problem when running fillCylinder in tutorials: cannot pour particles

I use the following syntax:
fix ins nve_group pour 10000 1 200 region bc vol 0.4 100 diam 0.001 0.001 dens 200 200 vel 0. 0. 0. 0. 0.
Then an error comes:
ERROR: Invalid fix style (modify.cpp:710)

The DEM input file and the log file for the run are attached.

Could you please help me solve this problem?
Thanks.

I used the defalut ErgunTestmpi solver to solve the bubbles(DEM particles) movement in water. I have set up the bubble's density as 1.225 in DEM/in.XXX file and the water's density as 998.2 in DEM/0/rho file, but I found the bubbles didn't move up in water under the buoyancy force effects. I have open the Archimedes forceModels in couplingproperties file.

I tried to use the insert/steam or insert/pack command to make the particle inject into the reactor by a certain velocity continuously, so I write these commands in the in.XXX file:

Hi cfdemers,

I've modified the tutorial cfdemSolverPiso to simulate cracks in some porous media filled with fluids.
The OpenFoam part with the changes I've made seems okay, but when I'm trying to modify the DEM file in.liggghts_resume I get some error :

Coupling...
LIGGGHTS could not find property radius to write data from calling program to.
ERROR on proc 0: This is fatal (cfd_datacoupling_mpi.h:160)

My problem seems to be that I'm changing the atom_style to atomic as I need to use a lj/cut pair_style. Here's what I've done :

Hi there, I am receiving the following error right when coupled run starts. I appreciate any help.

I'm a new cfdem user, about coupling intervals, I have several questions:

1. How to calculate its value?
2. In the DEM/in.XXX file, there is a command about coupling:
fix cfd all couple/cfd couple_every n mpi
what's the relationship between coupling intervals and value n. They are equivalent ?
3. The meaning of coupling intervals, I think it's:
run CFD $couplinginterval and then run DEM, the DEM step number defined in "run n" command in in.XXX file.
Is there anything wrong?

Thanks anyway,
Zhao

we have a tortuous micro-channel of varying cross-sections. we want to model the actual filtration of the particles when particle laden flow flows through the channel. for example the channel size is less then 1 micron and if the particle size is more then 1 micron, can it filter and model the deposition of particle.

Thanks
Lalit