CFDEM®coupling - User Forum

Hi all,

I'm currently trying to set up the CFDEM(R) workbench in a personal computer with Ubuntu 16.04.1 LTS which has foam-extend-3.2 among other version of foam-extend and OpenFOAM(R).

So far, I have managed to compile LIGGGTHS(R) and CFDEM(R), following the instructions provided in:

https://www.cfdem.com/system/files/githubaccess_public.pdf

Hi all, I am having problems with ram usage.

I am running a simulation with particles of two sizes, 150000 particles of 1mm and 150000 particles of 1.8mm. The CFD mesh has arround 90.000 elements.

The problem is that the simulation uses a lot of memory, ~110GB when the total number of particles is inside the domain. I guess that I am having problems with my neighbor list.

First I set the skin to be equal to 1 particle (first the smallest and then the biggest) and the simulation started using swap (0ver 128 GB).

Help me
in terminals:

ERROR from your CFDEM code!
ERROR: your OpenFOAM(R) version is not supported!
Please use a version that is supported, i.e., see the bashrc file in the source directory!

regards
Dinesh kumar

help me
while running fillcylinder tutorials it show error

mesh was built before - using old mesh
rm: cannot remove '/home/test/CFDEM/test-PUBLIC-/run/cfdemPostproc/fillCylinder/DEM/post/*': No such file or directory

// run_liggghts_fillCylinder_DEM //

/home/test/CFDEM/test-PUBLIC-/run/cfdemPostproc/fillCylinder/DEM

LIGGGHTS (Version LIGGGHTS-PUBLIC 3.6.0, compiled 2017-05-03-10:28:42 by test, git commit 18a96adf8688e0d46423c7d812001a8d9e0a9af0)
atom_style granular
atom_modify map array
communicate single vel yes

Hello,
I am trying to characterize the cfdemSolverIB.
I adapted the twoSpheresGlowinskiMPI example, removing one sphere to have the simple one falling particle. All my units are consistent with SI system (in both DEM and CFD sides). I want to measure the z velocity of the sphere.
I started testing this using ArchimidesIB force as the only interaction. I used different densities and gravities values. All those cases work fine and they match to the theoretical prediction.

Hi all, I want to check the influence of neighbour list cutoff radii on total (CFD-DEM) memory consumption.

If I grep "Memory usage per processor" from the log file I get the memory used by liggghts, but this value is only a fraction than the value that htop gives me. Any suggestion?

I saw also running ErgunTestMPI that at the end gives a memory histogram per proccessor, this is done by selecting standardClock from couplingProperties file? Because I do that but I don't get the same type of message on my simulation case.

Regards,
Mauyro

Hi cfdemers!

I have readed all tutorials file and I find that someone is "run 0" and other is "run 1" in the end of file "in.liggghts_run".
I notice the cfd coupling is specificed by : "fix cfd all couple/cfd couple_every 100 mpi".

so what's the diffirence?

Dear all
I am working on a coupled cfd-dem model, I am using stress servo walls for DEM part, and I want to know is it possible to use fix mesh/surface/stress/servo and fix box/relax simultaneously?
dose fix box/relax is appropriate option for implementing a hydro-static pressure?
any help is appreciated.
Talat

Hi all,
when i launch the cfdemTestTUT command it gives me this output

path to provide the path relative to CFDEM_TUT_DIR

example:
cfdemSolverPiso/settlingTestMPI/dir

*********************************************
* C F D E M (R) c o u p l i n g *
* *
* by DCS Computing GmbH *
* www.dcs-computing.com *
*********************************************

*********************************
CFDEM(R)coupling system settings:
*********************************
CFDEM_VERSION=PUBLIC
couple to OF_VERSION=3.0.x
compile option=Opt