CFDEM®coupling - User Forum

Hi,
Can I Use New Drag Correlation instead of the Yu et. al correlation used in the CFD- DEM approach, for fluidised beds, and Since I'm new to both LIGGGHTS and Linux can you guide as to where and how this modification be made.

Thanks,
Kshitij

Hi cfdemers,

I added the command
lattice sc 1
in order to add more particles randomly in settlingTest by
create_atoms 1 random 10 1 NULL units box

However, I got an error message in DEM log file

// run_cfdemSolverPisoExplicit_settlingTest_DEM //

/mycfdem/settlingTest/DEM

LIGGGHTS 1.1.10 based on lammps-10Mar10
Created orthogonal box = (0 0 0) to (0.1 0.1 0.1)
1 by 1 by 1 processor grid
Lattice spacing in x,y,z = 1 1 1
ERROR: Illegal create_atoms command

Any idea?

Thanks.

Ruo

Hi,
I am trying to run a simulation like the paddle mixer from the CFD-DEM page. The GGI is included in the 1.5-dev but not in the 1.6 of OpenFOAM, so I tried to compile the solver with 1.5-dev but it doesn't work.
How was the paddle mixer setup?
Thank you
Stephan

Hi, Chris!

I have coupled the interDyMFoam solver with LIGGGHTS by using you framework that has previously done in icoFoam solver. However, as you may know, I just modified the UEqn.H and pEqn.H by adding the fp term and the main cpp file interDyMFoam.c by adding the do particle stuff sentences.

However, I am not sure if it is correct because although the impact of fluid on particles is realistic, the impact of particles on fluids is not that good.

Do I need to modify other .H files such as the alphaEqn.H? If yes, how? Just deduct the alpha value by the void fraction?

Dear All
I installed the CFDDEM on my computer, the istallations seem to be complited, but then I am trying to test it by runing the mycfdem/settlingTest/Allrun.sh. and I get the message
wait for file "/opt/mycfdem/settlingTest/CFD/couplingFiles/x1"

and it wait forever
can anybody help me?
I never used the code.

Thank you very much
Esti

Hi,
I have just downloaded the new version of LIGGGHTS (1.2.5 beta) and compiled it. Just to check, I ran examples of LIGGGHTS that works fine but when I tried to run it for CFD-DEM coupling it gives me the following error. Any body have a clue?

"LIGGGHTS 1.2.5-beta based on lammps-10Mar10
Created orthogonal box = (0 0 0) to (0.1 0.1 0.1)
1 by 1 by 1 processor grid
ERROR: Illegal fix couple/cfd/file command, expecting keyword 'couple_every' "

Regards,
Naveed

#####################################
# compile solver
#####################################

#- change the path and type:
cd ../cfdemSolverPisoExplicit/

#- to compile the solver type:
rmdepall
wclean
wmake

When i do the above , there is an error as follows, can anybody help?

Hi Christoph,

I'm trying to install CFDEM on a Fedora 14 system. I have installed liggghts and openFoam. Both work well.
Unfortunately I get the following error message when I try to compile it via "wmake libso" in the mycfdem/cfdemParticle directory:

options:10:12: warning: backslash-newline at end of file
linuxGccDPOpt/options:6: *** missing separator. Stop.
wmake error: file 'Make/linuxGccDPOpt/objectFiles' could not be created

I have not touched the options file. It looks like:

EXE_INC = \
-I ./cfdemParticle \
-I$(LIB_SRC)/finiteVolume/lnInclude \

Hi Chris,
I am interested to simulate a fluidized bed chemical reactors. The particles might be treated as chemical reactants that reacts with the surrounding fluid. This reaction increases the concentration of a particular substance (at first step only concentration ,no heat exchange is considered yet might be later on) in the fluid. I have looked up your code, and I found only momentum coupling. In this regard, I have certain querries
1- Do I need mass coupling for this?

Hi, Chris,

If I want to couple water flow and granular flow, is it possible for me to use your cfdem code?

Could you give me some suggestions? Many thanks for your kind help!

B.t.w., how to enable buoyancy?

Best,
Tong