CFDEM®coupling - User Forum

hello
thx for the newest version of cfdem.!!
Everything is ok except for the cfdemPostCalc.
it seems that the createFields.H is missing in the application/utilities/cfdemPostCalc..
after I copy a file from solvers/cfdemSolverPiso, everything goes somothly.
thx.
s.l

Dear guys, it seems that the LB codes were designed for FLUENT ???
node/405
I'm a freashman in CFDEM. Is any step-by-step tutorial to implement LB simulation?

Thank you very much!

Hi,
I am compiling CFDEM 2 and LIGGGHTS 1.5 on my UBUNTU machine.
In compiling src (for CFDEM), after I enter wmake libso, an error comes up that shows that it can’t find certain *.h files.

I searched for fvcfd.h and I found it somewhere in OpenFOAM/OpenFOAM-1.7.x folder. I manually copied it into LIGGGHTS src folder and re-compiled, this time it complains about another file (parrun.h) that it can’t find.

Hi all,

While installing the coupling, i get the following message-
( i have pasted the last few lines )

subModels/dataExchangeModel/twoWayMPI/twoWayMPI.C: In constructor ‘Foam::twoWayMPI::twoWayMPI(const Foam::dictionary&, Foam::cfdemCloud&)’:
subModels/dataExchangeModel/twoWayMPI/twoWayMPI.C:69:19: warning: use of old-style cast [-Wold-style-cast]
subModels/dataExchangeModel/twoWayMPI/twoWayMPI.C:69:19: warning: use of old-style cast [-Wold-style-cast]
subModels/dataExchangeModel/twoWayMPI/twoWayMPI.C:70:19: warning: use of old-style cast [-Wold-style-cast]

Dear CFDEM community,

While trying to complete the steps for installing CFD-DEM (as described in setup_LIGGGHTS__OpenFoamR_CFDEM_2p0_on_Ubuntu1004_02042012.txt), the compilation fails at wmake (see below).

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

#- change the /user-1.7.1/applications/solvers/cfdemSolverPiso_shared path:

#- to compile the solver type:
rmdepall
wclean
wmake

The error is:

javier@javier-VirtualBox:~/OpenFOAM/javier-1.7.x/applications/solvers/cfdemSolverPiso_shared$ wmake

Hi,

I try to simulate the pressure drop in a gas-fluidized bed with small particles (dp = 100um). The pressure drop over the packed bed is in good agreement with the Ergun equation but somehow the pressure drop over the bubbling fluidized bed is always about 20% below the analytic solution of the pressure drop due to the particle weight (Delta_p = particle_weight*gravity/A_bed).

Does anybody has an idea why?

Thanks!

------------------------

I attached two plots:

Dear all!

hello everyone,
I'm using the cfdemSolverPisoScalar_shared, but the solver blowed up every time.
It's believed that the problem must be lies in the setting or the mesh structure. I have tested many boundary conditions also the inlet velocity and mesh structure, few effects have been gained.
It's a cubic container.
The calculation domain is 60mm*6.4mm*600mm with 20*8*200 mesh in x,y,z direction, particle diameter is 0.8mm.
The boundary condition for front and back is wall.

Dear CFDEMers,
My test case ran into a trouble: the solver got stucked. I setup my case to solve a bubble bed case with 200 thousands particles. The solver ran quite well until I stoped it and make some refinement to the grids and increase the parallel-run processors numbers. After that no matter how I change these combition the solver just ran first step and it was stuck at the output line:

" Time = 0.0001

Courant Number mean: 0.000166667 max: 0.05
- evolve()
Starting up LIGGGHTS
Executing command: 'run 100 '

Hi

I successful run a simulation of a cold fluid heating up while passing through a packed bed of big (D_p=1cm) hot particles. (similar to your test case "heat transfer in packed bed"). However, if I use small particles (e.g. D_p=200e-6m) the simulations runs without an error but the particle temperature has an unrealistic negative value (e.g. T_p = -4000K).

Does anyone has an idea where the problem could be?

Thanks!