CFDEM®coupling - User Forum

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

Hi all,

OpenFOAM 3.0.x works without any problems. Furthermore, my fcdemSysTest looks o.k.:

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

I make the changes in /.bashrc according the tutorials. When I open a new terminal, it shows me:

using default CFDEM_ADD_LIBS_DIR=/home/cae/CFDEM/CFDEMcoupling-PUBLIC-3.0.1/src/lagrangian/cfdemParticle/etc/addLibs_universal
using default CFDEM_ADD_LIBS_NAME=additionalLibs_3.0.1
!!! ERROR !!!: CFDEM_ADD_LIBS_DIR/CFDEM_ADD_LIBS_NAME=/home/cae/CFDEM/CFDEMcoupling-PUBLIC-3.0.1/src/lagrangian/cfdemParticle/etc/addLibs_universal/additionalLibs_3.0.1 does not exist.
make new dirs /home/cae/CFDEM/cae-PUBLIC-3.0.1 ? (y/n)

As noted in the online documentation:
//////////////////////////////////////////////////////////
liggghtsCommandModels
(
execute
);
executeProps0
{
command
(
run
$couplingInterval
);
runFirst switch1;
runLast switch2;
runEveryCouplingStep switch3;
runEveryWriteStep switch4;
verbose;
}
///////////////////////////////////////////////////////////////////

I noticed that even I set in controlDict as below:

startFrom startTime;

startTime 0.05;

stopAt endTime;

endTime 0.1;

deltaT 0.001;

writeControl adjustableRunTime;

writeInterval 0.01;

The folder for time=0.1 will not be generated. Does anyone can tell me how to get it?