CFDEM®coupling - User Forum

Hello All,

I am running the ErgunTestMPI from the tutorial, and I want to plot the total head across the sample, and the differential head between specific layers. IS this possible in Paraview?

Thanks,
Nahid

Hello everyone,

I am running the coupled model with multi-sphere particles by creating a very loose packing density (%80 void fraction) inside a cylinder, where the air flows between the two ends of the cylinder.

I am using both friction and cohesion models in order to keep the particle as far as possible from each other to create such loose packing.

Each of my multi-sphere particle consists of one large particle in the middle and six particles with half large particle radius on the top of large particle (No overlaping).

Dear CFDEMers,

I am looking at the twoSpheres tutorial, do you know why a dummy rho field = 1 is created when the IBSolver is run? Can you simply define a new rho field if you want to simulate a different fluid? Will all the forces between particles and fluid be computed correctly?

Kind regards,
Frederiek

Hello,

I try to execute a coupled simulation with the cfdemSolverPIso. Unfortunately I always receive following error according to Ksl data, although I implented the Ksl in the "0"-folder:

timeStepFraction() = 0.02
LIGGGHTS could not find property Ksl requested by calling program. Check your model settings in LIGGGHTS.
ERROR: This error is fatal (../cfd_datacoupling.cpp:153)

What is meant with "check your model settings in LIGGGHTS"?
I really don't know how to fix this error, so every help is appreciated!

Thank you !

Kind regards

Hi, I'm simulating particles (~ 20000) moving in the fluid (with no initial flow).
After the calculation, I wanted to track the location of some particles (5~10 particles) in the simulation using paraview.
However, here is the problem that the 'id' of particle keeps changing with time variation.
(it means that if the 'id' of lowest positioned particle is No.490, after some time steps later the 'id' of same particle is not No.490)
The problem occurs due to the parallel processing?? or array style??

I am new to cfdem.I have tried varying all parameters in the packed bed tutorial and got different outputs.But when I vary the particle temperature in the liggghts_run file there is no change in the output, however high or low the value is.By default the value was 600 K and I have tried changing it to 1000K,500K,400K etc but everything gives me the same output for the fluid temperature distribution.

Hello everybody,

Some strange massage occurs when I try to run my simulation.
All 8 processor directories are available.
Maybe you know some advice.

Hello everyone,

I am trying to use JKR model with CFDEM coupling model but I keep getting the following error:

Dear all, I have just installed the newest version of CFDEM 3.8.0 and can run the tutorial example successfully. However, when I am running a code of myself, I run into the error below. I attached my log file so that you may know how to fix this problem:

// run_parallel_cfdemSolverPiso_ErgunTestMPI_CFDDEM //

/home/Rachel/CFDEM/CFDEMcoupling-PUBLIC-5.x/tutorials/cfdemSolverPiso/ErgunTestMPI_1206/CFD

Dear all,

I have just installed the newest version of CFDEM (3.8.0) and have sucessfully run the example case in my computer (i.e ErgunTestMPI). However when I am trying to transfer the CFD results into VTK files, I use the command "foamToVTK" and get the error message as below:

---> FOAM FATAL IO ERROR:
wrong token type - expected scalar, found on line 5 the punctuation token ')'

I didn't change anything of this example and I don't know how to fix this problem, could anyone please give some clues? Thanks ahead!

Regards,
Rachel