CFDEM®coupling - User Forum

Hi

I was just wondering what everyone else is using for discretisation schemes for their coupled models and what kind of performance you are getting? The "standard" ones that come from the tutorial cases (and also often found in OF-related literature for pure CFD cases) are:

gradSchemes: Gauss linear
divSchemes: Gauss linear or Gauss limitedLinear 1
laplacianSchemes: Gauss linear corrected
interpolationSchemes: linear
snGradSchemes: corrected

Hello all,

I need to put particles on a curved surface. In OpenFoam I can do that easily using blockMesh, but for DEM part, how can I create the wavy region to insert particles?

I used gmsh to create the curved surface with the same coordinate i used in blockMesh and saved them as .stl file to read by DEM.

When i run the file it shows the following error:
ERROR: Fix insert/stream (id ins): command requires a planar face for insertion (fix_insert_stream.cpp:230)

How can i insert partcle in a curved/wavy surface.
Any suggestion will be appreciated.

Hi All,

I am quite interested in the simulation of water drying, which is shown in the CFDEM Features. However, it is in process. Could anyone please let me know how to add the water (moisture) in the simulation system? And When this features will be released? Any suggestion and idea would be greatly appreciated！

Thanks so much~

Kun

I read what I could through the src file of cfd_coupling_convection and the convection coupling is being applied through an addendum of the DEM heat equation with a source term. In my earlier DEM simulations, I've been applying nuclear heating to pebbles and now want to consider an interstitial coolant gas. The nuclear heating is of course also with a source term added to the pebbles.

Hi

Is there any official criteria for guessing the coupling interval size and/or CFD timestep size based on particle/fluid properties? (DEM has the Rayleigh and Hertz criteria based on particle properties for particle collision time steps)

Or is it just a matter of trial and error (experience) to find what works best?

Cheers
Evan

Hi,

I have a problem with compiling CFDEM (2.5.5) with OpenFoam 2.1.1. It's all working fine until I do "cfdemCompCFDEM". The resulting errors are (see the attachment for the complete log file):

Hello,

I modified blockMeshDict and in.liggghts_init files of ErgunTestMPI case to enhance my understanding.

In CFD directory blockMesh runs good, but in DEM directory when I run the in.liggghts_init file using liggghts excutable, it shows an error-

pair_style gran/hertz/history #Hertzian without cohesion
ERROR: Illegal pair_style command

How can i overcome this error.

Please help me out.

Thanks
Manjura

Hi,

after getting latest version CFDEM via git

sudo git clone https://github.com/CFDEMproject/CFDEMcoupling-PUBLIC.git

I changed to some Make-root dirs, run rmdepall, wclean and wmake but all compiling sessions broke by missing cfdemCloudIB.H
Is this a Ubuntu 13.04 specific error or is cfdemCloudIB.H missing in the git clone?

Regards

Paul

/home/kbuntu/CFDEM/kbuntu-PUBLIC-2.2.0/run/ErgunTestMPI/parCFDDEMrun.sh: line 13: /etc/functions.sh: No such file or directory
/home/kbuntu/CFDEM/kbuntu-PUBLIC-2.2.0/run/ErgunTestMPI/parCFDDEMrun.sh: line 31: parCFDDEMrun: command not found
rm: cannot remove `cfdemSolverPiso_ErgunTestMPI.eps': No such file or directory
/home/kbuntu/CFDEM/kbuntu-PUBLIC-2.2.0/run/ErgunTestMPI/parCFDDEMrun.sh: line 46: octave: command not found

Hi,
I am trying to set up my first (modified) CFDEM case inspired by the
ErgunTestMPI case.

My setup is a square box sheared on top with a velocity inlet, a outlet
and periodic conditions in lateral direction (top moving wall, bottom fixed)

I can run the case without problems in pisoFoam.

For the particles I insert a few (3-5) particles in the center of the box
similar to the in_init function of the ErgunTestMPI

I also took the coupling parameters from this case.

I can run the init function in liggghts