CFDEM®coupling - User Forum

Hi Chris,

I am a bit curious about the term "explicit force" (i.e. expParticleForces in paraview).

When using Model A, the governing equation is referred to Set II according to the paper :

Z. Y, Zhou, et. al (2010), Discrete particle simulation of particle-fluid flow...

Hi,
Can anybody tell me how to compile the changes made if we create a new solver similar to CfdemSolverPiso.
Please tell what all steps would be required as in making new folder, .C file, compiling, any changes made to bashrc etc.

Thanks a lot.

Hello Everybody,

i'm pretty new to CFD. But i have created a DEM-CFD coupled model, which run pretty good until i changed the boundary conditions. The geometry is quite simple and looks like a big hopper with a block of particles on top. After a initialisation time a wall is deleted and all particles can fall to the ground. The hopper has an inlet/outlet on the top and a second on the bottom. The side walls are defined as walls. The mesh is created with blockMesh.

Hi, I see in the liggghts script of CFDEM tutorials there are two commands "fix couple/cfd" and "fix couple/cfd/force". Besides, there is also something like
#force : f_couple_cfd[0] f_couple_cfd[1] f_couple_cfd[2]
#node : f_couple_cfd[6]
#cell id : f_couple_cfd[7]
Are they just comments or they could also be a command?
These commands are not in the Liggghts manual, I cannot find a description about them, neither in the CFDEM documents? Is there a new manual released or something?
Where can I find a description about these commands?

Hi
Any body told me if he/she used CFD-DEM for Tracing Particle clogging in microreactor (Size 1mm).
i want to know how efficient it works to Understand the concept of Clogging.
i am new so i need your suggestions.

Hello CFDEM Users,

I saw a "#define comp" switch in CFDEM new versions. I was wondering what was that for. I could guess seeing the Make/options that it is for compressible turbulence modeling. Any way tried to compile it and successfully done for CFDEM src. But It was not successful for the the compilation of Solvers. It complains that the singlePhaseTransportModel is not compatible. Have any body faced the same problems and what was the solution???

MLD

I have tried to create a simple pipe case with a pipe and adding wear to the walls.

The case runs fine up to 0.03s and then stalls for a long time and then crashes.

I cannot find out what the problem is.
Tried adjusting almost everything I think is relevant, but no luck.

Starting guess comes from a steady-state flow solution.

If one of the experts would kindly take a look at the case provided here I would be most grateful.

Dear there,

I'm new to Linux and it takes me a lot time try to install CFDEMcoupling.
In the past 1 month, I tried to install CFDEMcoupling, no succeed and now I'm really frustrated.
Can anyone here give me an hand please?

What I've done is
1. Install Ubuntu 12.04 64bit
2. Install OpenFOAM-2.2.x following the procedure (Repository version), tested, ok
3. Install CFDEMcoupling following the PDF, cfdemCompLIG-ok, cfdemCompCFDEM-error

Hello everyone,

I have a problem about the document of LiggghtsCommands in the constant folder. I can search the liggghtsCommandModels and execute files from the CFDEM folder or liggghts one. But I cannot get any clue about "set","total","noBlanks", "slash" in executeProps 1. Are they the command from the ubuntu system? or or opencode? any comments will be appreciated. thanks in advanced.

yyu

Hi Christoph,

I am testing a simple CFD-DEM case of cyclone separator using cfdemSolverPiso. Before doing the coupling of CFD-DEM, CFD and DEM simulation were tested separately and worked fine. However, when performing CFD-DEM coupling, it seems that the same command " fix insert/stream " in DEM does not work with cfdemPisoSolver.

CFD test:

DEM test: