CFDEM®coupling - User Forum

Hi,

Could anyone help me set-up the free surface?

Is it available in cfd-dem 2.0?

Thanks.

rq

Hi,
I stuck at following error message when performed wmake libso under ../src/lagrangian/cfdemParticle

..
...
..
-I/home/ram/OpenFOAM/OpenFOAM-1.7.1/src/meshTools/lnInclude -I/home/ram/OpenFOAM/OpenFOAM-1.7.1/src/lagrangian/basic/lnInclude -I/home/ram/OpenFOAM/ThirdParty-1.7.1/platforms/linuxGcc/openmpi-1.4.1/include/ -I/home/ram/LIGGGHTS/liggghts_1p0p3/src -IlnInclude -I. -I/home/ram/OpenFOAM/OpenFOAM-1.7.1/src/OpenFOAM/lnInclude -I/home/ram/OpenFOAM/OpenFOAM-1.7.1/src/OSspecific/POSIX/lnInclude -fPIC -c $SOURCE -o Make/linuxGccDPOpt/twoWayMPI.o

Hi,
The wmake for Cfdemparticle src ran smoothly for a while then I got following errors:
subModels/dataExchangeModel/twoWayMPI/twoWayMPI.H:45:17: error: mpi.h: No such file or directory
subModels/dataExchangeModel/twoWayMPI/twoWayMPI.H:46:62: error: lammps.h: No such file or directory
subModels/dataExchangeModel/twoWayMPI/twoWayMPI.H:47:19: error: input.h: No such file or directory
subModels/dataExchangeModel/twoWayMPI/twoWayMPI.H:48:18: error: atom.h: No such file or directory
subModels/dataExchangeModel/twoWayMPI/twoWayMPI.H:49:21: error: library.h: No such file or directory

Hi cfdemers,

I tried to change the turbulence model from RAS to LES in ErgunTestMPI.

I got error message like below:

// run_parallel_cfdemSolverPiso_ErgunTestMPI_CFDDEM_shared //

/home/ruo/OpenFOAM/ruo-1.6/run/PFliggghts/CFD

/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.6 |

Hi,

first of all I want to thank you for the real great work which makes my life somehow easier. I already worked with the first release of the coupling without any problems but with the current version I ran into some.

Well, if I install openfoam and paraview like described they are located in the /opt folde. Hence, I changed the owner and work in the /opt folder. Downloading LIGGGHTS and CFDEM was no problem, compiling LIGGGHTS was easy, too. But when I try to compile the CFDEM I receive the following error after a couple of files were compiled succesfully:

Hello,
I am trying to wmake the cfdemParticle src. However the twoWayMPI.H file tries to include library_cfd_coupling.h. According to the comments, it should be in the LIGGGHTS src, but I cannot find it. I successfully installed LIGGGHTS yesterday with the latest distribution. It's a wonderful program.
Thanks for your help.
Mark

Hi Chris,

Thanks for releasing this wonderful CFDEM 2.0!

I just want to know the LIGGGHTS lib name, and I use:
CFDEM_LIGGGHTS_LIB_NAME=lmp_ubuntu

It seems to be not right, because I got:
/usr/bin/ld: cannot find -llmp_ubuntu

when I wmake libso.

Thanks a lot!!

Best,
Tong

Hi,

I found

"fix cfd all couple/cfd/force couple_every 100 mpi"
has to be changed to

"fix cfd all couple/cfd/force every 100 mpi"

in DEM/in.liggghts_init

rq

Hi Chris,

I feel sorry to disturb you, but I noticed that there are several comments in the input file of DEM:

#force : f_couple_cfd[0] f_couple_cfd[1] f_couple_cfd[2]
#node : f_couple_cfd[6]
#cell id : f_couple_cfd[7]

How do I output the drag forces and cell id of each particle together with dump in liggghts?

Thanks a lot for your kind help!

Best,
Tong

I am trying to set up a simulation similar to the partly fluidized bed examples on the CFDEM example page. Were those examples run using the same code as was released?
I find that when the particles get that close together the CFD simulation quickly gets very high and unrealistic velocities and crashes.
Reducing the timesteps does not seem to help.

Any suggestions?
Thanks,
Alexa