CFDEM®coupling - User Forum

Hi all,

I found the default density is 1. Could anyone tell me how to change it to 1000 (for water)?

Thanks.

rq

Hi all

Just wondering if it might be possible to couple Liggghts and Fluent. I'm not really familiar with either package and most of my experience is in running simple models in CFX. I have managed to get Liggghts setup which I'm proud of since I'm a complete Linux newbie. My university has a lot of Fluent die-hards and I get asked this question a bit.

Regards T

Hi all,
I'm new to LIGGGHTS and I got some problems when I run the examples in CFD-DEM coupling package. The example is settlingTestMPI.
First of all, I cannot get the cfdemSolverPiso_settlingTestMPI.eps because of the error bellow:
error: load: ../../DEM/post/velocity.txt: inconsistent number of columns near line 171
error: load: unable to extract matrix size from file `../../DEM/post/velocity.txt'
error: called from:
error: settlingVelocity.m at line 41, column 6

Dear group,
Any help is very welcome.
I am following Christoph Goniva step by step procedure for
cdf-dem instalation on ubunt 10.04 LTS.
I am getting stuck in the following steps :
step :
#udo /usr/libexec/locate.updatedb
message :
Error: 0: couldn't open source file
/usr/libexec/locate.updatedb: No such file or directory

step : (install lighhts)
make makelib
message :
grep: cfd_regionmodel_*.h: No such file or directory

step : (install cfdem version beta 2.0)
wmake libso

message :

Dear CFDEM Community,

I have troubles in installing cfdem under CentOS x86_64 (ver 5.3 of Rocks Cluster).
Maybe the difficulty comes from the need to use the gcc-4.5.x compiler required to compile both the last versions of OpenFOAM and CFDEM. This is not the system gcc compiler. It cannot be upgraded in order to avoid compatibility issues with the Cluster functioning.

I am almost sure I have done everything needed to ensure that all components and libraries required have been compiled under the same gcc environment and adopting the needed compilation options (in particular –fPIC).

Hi everybody,

I've got a question about gravity. I am trying to model a dense system with a density ratio of 6 by particles' to fluid's density. If I apply gravity, are the buoyancy effects taken into account? Well, I tried to look at the source of your coupling but I haven't found anything. If I was blind - then I'm sorry.

If it's not taken into account I would reduce the gravity taken the density ratio into account (in my example reduce to 8.2). Do you think that would be the best way?

So, looking forward to hear anything.

Kind regards,
Stefan

Hi,
I've successfully installed openmpi, openfoam and ligghts, as well as compiling the cfdem src. But during compiling the solver, I have following errors:
/home/yanheng/OpenFOAM/yanheng-1.7.1/lib/linux64GccDPOpt/liblagrangianCFDEM_shared.so: undefined reference to `MPI_Type_get_envelope'
/home/yanheng/OpenFOAM/yanheng-1.7.1/lib/linux64GccDPOpt/liblagrangianCFDEM_shared.so: undefined reference to `MPI_Waitall'
/home/yanheng/OpenFOAM/yanheng-1.7.1/lib/linux64GccDPOpt/liblagrangianCFDEM_shared.so: undefined reference to `ompi_mpi_comm_null'

Dear CFDEM users,
I want to use the cfdem interface for reacting flows. For that I thought of combining coalChemistryFoam with cfdemSolverPiso_shared. During modifying I just try to run serially and come to know that cfdemSolverPiso_shared produces bugs:
........
.......
Reading g
Selecting locateModel standard
Selecting momCoupleModel implicitCouple
Selecting dataExchangeModel twoWayMPI
twoWayMPI.C- this should no longer be needed
Starting up LIGGGHTS for first time execution
*** An error occurred in MPI_Comm_rank
*** before MPI was initialized

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