CFDEM®coupling - User Forum

Dear All,

I am trying to run a modified Ergun test case, therefore a CFDEM fluidized bed simulation, on a HPC cluster. As "modified" Ergun test case, I mean (i) more and smaller particles in a (ii) bigger cylinder (actually a geometry consisting of a cylinder on top of a truncated cone).

Do you know which is the best configuration/set up to run efficiently such a CFDEM simulation on a HPC with up to 4000 cores ?
Any trick ? Any hint to have a good HPC scalability ?

Dear All,

Hi all I am installing CFDEM on a cluster, and I am having some issues. I followed the instructions on the documentation and I succeed installing OpenFOAM and LIGGGHTS. To install LIGGGHTS I had to to tweak the Makefile.auto to download the vtk lib ( USE_VTK ?= "OFF" and AUTOINSTALL_VTK ?= "ON").

Just in case I am using the step by step installation
cfdemCompLIG
cfdemCompCFDEMsrc
cfdemCompCFDEMsol
cfdemCompCFDEMuti

Hi all, I am running a simulation based on the periodic channel tutorial. I succeed running several variations of It but now suddenly the simulation crash always in the same point. As you can see in the attached log file below, it's not due to high Courant number or problems converging the pressure field. Any idea?

Hi!

I made a bash script that converts dump files to VTK. I tested it on several cases and it's two times faster than LPP. Check it out here https://github.com/alek-/dumpToVTK

Works only for "id type x y z ix iy iz vx vy vz fx fy fz " dump, but it's easy to modify.

Cheers

Hello, I am using the periodic channel tutorial. I want to modify the fluid velocity to make it time depending. In the fvOption file, I need to adjust it to set that the flow velocity starts to act after a specific time. Currently, the flow has a velocity at time = 0 s. I want to fix another start time, for example at t = 1 s. I appreciate any suggestions.

Same kind of error

Hi all! I get a similar error message from the log file (looking for treatForceExplicit ... not found in dict, using default. treatForceExplicit = false
). I compared system/controlDict file in order to avoid syntax changes from different versions (the simulation was set up in another pc).

Here the log file:

// base_case_MondalIB //

/home/federico/CFDEM/federico-PUBLIC-3.0.x/run/dp8staticMauro/CFD

Hi,

I'm trying to simulate the heat trasnfer in a cylindrical chamber filled with particles. The particles are slightly bigger than the mesh cell. At the very maximum, a particle could span across 8 cfdMeshCellCenters at a time. So, I'm confused about the void fraction model to be used - especially between Divided and Gauss Model.

Hi,

Can someone briefly explain what the keyword depth does in cfdemsolverIB case? Does it mean the extent of cells the phiIB is diffused?

Thanks.

Yesaswi

Hi,
I have managed to install CFDEM on my local machine. I am trying to install CFDEM on university hpc. I have managed to compile liggghts code. As I am compiling CFEDEM i get log_compile_result_src_fail . I have attached log file for compileCFDEMcoupling_cfdemParticle. Also if I run solver with failed source log file I get following error (log file with name slurm-450370.txt as attached) after running in parallel. I am not sure where exactly I am doing wrong while compiling or running case. I am using OpenFOAM-3.0.0 as it is installed on hpc.

Thank you