CFDEM®coupling - User Forum

Hi all,

I'm running a simulation with CFDEM 2.7.1 to model particle fluidization in a cylinder fluidized bed. The bed dimensions are: 15 cm diameter and 22.5 cm tall. In my fluidized bed, I have near 600,000 particles (particle size 1.5 mm diameter). Two runs were setup with 32 and 64 CPUs. The computation is really slow in either 32 or 64 CPU cases. I checked the log file and found out the problem is in the coupling process between OpenFOAM and LIGGGHTS. In each coupling, it approximately takes more than 10 minutes to finish. Is it normal in this situation?

Hi all,

Hi,

I am still working on a coupled ring shear test and I am struggeling with the pressure in the fluid. Does anybody know how to implement a hydrostatic pressure in the fluid phase? By the way, I am using the PisoSolver.

Thank you very much.
Alaska

Hi everybody,

I have just started recently working with CFDEM, and I am still not very familiar with openFoam requirements. I am trying to run a very simple case and was hoping to get some advice on which solver ( tutorial example) would be the most suitable for my case.

The case I am running is: powder flow through an orifice (hopper discharge) into :

1- Open box .
2- Small closed box, where pressure increases inside the box during powder flow.
3- Powder flow under vacuum.

Thanks in advance.

Regards,

Luton

Hello,
right now, I have my problems to compile CFDEM.
Liggght compiles without any problems but CFDEM makes problems.
It says that c3po is missing. I have checked the path and in deed, it is missing. I have downloaded CFDEM newly, but there it is also missing.

I have attatched the log files from cfdemSysTest, cfdemCompLIG and cfdemCompCFDEM.

I hope someone can help me.

Best regards
RobertG

I've compiled OpenFOAM-2.3.1 and LIGGGHTS without much problem, well, LIGGGHTS gives this output at the end which I don't understand:

Please provide the libraries to be compiled in the //home/alpha/CFDEM/CFDEMcoupling-PUBLIC-2.3.1/src/lagrangian/cfdemParticle/etc/library-list.txt file.
will change path...
rm: cannot remove `/home/alpha/CFDEM/CFDEMcoupling-PUBLIC-2.3.1/src/lagrangian/cfdemParticle/etc/log/log_compileCFDEMcoupling_cfdemParticle': No such file or directory

Hello, i have a problem when i run my own CFDEM case in a 8-core machine but i have no problems running the case in a 4-core machine. Both pc's has the same Ubuntu, LIGGGHTS, OpenFOAM and CFDEM versions. (I installed all the software in the same way).

This is the log file from de 4-core machine.
********************************************************************************************************************************
// run_parallel_cfdemSolverPiso_hidrociclon_CFDDEM //

/home/julian/Desktop/SimJR/CFD

Hi, I completed the installation of cfdem and tried to execute some tutorials. Then, I have two questions during the execution.

Hi everybody, I'm running simulations of particles inside water and I'm having problems to specify the system properties.
I know that the keyword convertToMeters in blockMeschDict specify the units in wich the vertices are listed. But defines also the units in wich the rest of the system properties must be specified? I mean the units in which rho, viscosity, etc. must be specified.
I could see that kind of difference on the values of rho and the viscosity in the examples ErgunTestMpi and ErgunTestMpi_cgs.

Regards,
Mauro Baldini

Dear All

i am working on the Modeling of contaminated sediment transport in lake\river" i need help regarding the above cited subject please send me some guide line so that i can start the basic fundamentals of modeling which model is relevant for the above subject

thank you very much