CFDEM®coupling - User Forum

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!

Hi,
I recently noted that the file blockMeshDict which is used for rearranging the mesh in CFD part is missing from the directory where it should be placed cfdemSolverPisoCase_shared/ErgunTestMPI/CFD/constant/polyMesh .
There are only mesh files that are already built (and probably refined mesh files) there. Was it done intentionally or is it just lost accidentally? And I'll appreciate if somebody can supply me with this file.
Thanks,
Andrew

Dear all,

i am trying to compile the CFDEM, i did step by step after
setup_LIGGGHTS__OpenFoamR_CFDEM_2p0_on_Ubuntu1004_24052011.txt

but by compiling of cthe cfdemparticle, wmake libso
i still got such a fatal error, library_cfd_coupling.h not found, not a directory or file. I checked the .bashrc file, i think, i should give the right one, i am not sure what could be a problem is it?

could any one help me for this kinda error?
Thanks a lot!

cheers!

Zhen

hello developer,
I am interested in the function item heatFlux in the controdict file in the folder - cfdemSolverPisoScalarCase_shared/packedBedTemp/CFD/system.
======================================================
libs ("libOpenFOAM.so""libgroovyBC.so""libsimpleFunctionObjects.so""libsimpleSwakFunctionObjects.so""libswakFunctionObjects.so");
functions
(

// simpleFunctionObjects
heatFlux
{
type patchHeatFlux;
functionObjectLibs
(
"libsimpleFunctionObjects.so"
);
verbose true;
patches
(
inlet
outlet

Hello,

Could anyone tell me on what Gap distance below Wurster tube depends ?And what is the expression to calculate "Normal coefficient of restitution"?

Thank you!