CFDEM®coupling - User Forum

Hi,
I got stuck when i run following command ( it is written in installation tutorial "source your ~/.bashrc file with the command:source ~/.bashrc"):

source ~/.bashrc

It can not do anything in terminal and then i can not open terminal later.
When i delete multiple lines written in bashrc then I can use terminal again. These multiples lines are :

#- source OpenFOAM-1.7.x
. $HOME/OpenFOAM/OpenFOAM-1.7.x/etc/bashrc
#- enable parallel compiling
export WM_NCOMPPROCS=2
#- source OpenFOAM-1.7.x
. $HOME/OpenFOAM/OpenFOAM-1.7.x/etc/bashrc
#- enable parallel compiling

Hi CFDEM Developers,
I am working on the coal combustion in OF, I am running a case with around 1500 coal parcels using four way coupling present in OF, But it seems to me it is taking too much. Using 8 processors, it took me a couple of days to simulate the case for 0.5 seconds and it is still running .
I once tried to couple the coal chemistry foam solver with your interface (CFDEM), i come to know some of the complications. I have few questions regarding this.

I have updated Chris's instructions for the CFDEM build process to correspond to the newest OpenFOAM version. Also I installed it on OpenSUSE 11.3 which I haven't seen detailed to date on the forums, so hopefully it will be of interest.

The instructions are tailored to a $HOME installation, however I did actually install it on an NFS-mounted drive for our computational cluster. If anyone is trying to do this and runs into problems I would be happy to provide some pointers based on my installation experience.

Hello

We're trying to compile the solver for the installation of CFDEM but we get the following error:

Hi ,
I am trying to run the Ergun test case for version 2.0.2.
I just followed :
decomposePar
mpirun
reconstrucPar
foamToVTK
cd ../DEM
However the pizza could not generate the vtk_out because
no dump.ligghts_init was generated. There is only the dump.liggghts_restart in
the post directory.

Also the following output is generated :
amscosta@amscosta-desktop:~/OpenFOAM/amscosta-1.7.x/run/cfdemSolverPiso_shared/ErgunTestMPI/CFD$ decomposePar
/*---------------------------------------------------------------------------*\

Hi,
Any help is very welcome.
I just downloaded the new beta version.
The src is compiling fine. However when compiling the solver, that compiled fine for the june/11 version, the following is displayed :
amscosta@amscosta-desktop:~/OpenFOAM/amscosta-1.7.x/applications/solvers/cfdemSolverPiso_shared$ wmake
Making dependency list for source file cfdemSolverPiso.C
could not open file RASModel.H for source file cfdemSolverPiso.C

Hi,

I'm new here and would like to ask two things that I need for my project. I would like to be sure if this is possible using this software.

- If I have for example water falling in a box, can I get the forces and torques acting on this body (the mesh) due to the fluid?
- May I change the states of the body (position, velocity, orientation, angular velocity) based on the forces and torques?

Thanks in advance for the help! Danmiela

Hi there,

I installed CFDEM based on OF 1.7.x and liggghts 1.3.3. (Remark: other than issues with using consistent compilers and the -fPIC option and fiddling around with paths it went smooth) and try to run it on cfdemSolverPisoCase_shared/settlingTestMPI

The error occurs in the bash function parCFDDEMRun(). It executes decomposePar successfully, fails removing couplingFiles/* because there are none. The fatal error occurs during the execution of the solver. Please find the complete error message below.

Hi Chris,

maybe you realise that I am trying to get a bit deeper into the code. And for the drag law I have some questions:

1) For the calculation of beta (I think it is mostly called this way) you used the term alpha^(1-xi). In different publications I found three different exponents: -xi, 1 - xi and 2 - xi
I haven't received the original paper, yet, so I don't know which is the correct one.

Hi everyone,

I've got some questions about the coupling.

1. If a density field is provided, the drag force is calculated in the correct way. What about the KSL-values? I haven't found anything about the density in the code and if I look at some references about KSL the equations to calculate it seems to be different. So maybe anyone can give me a hint where to find a description about the used KSL model (I think in a further version the Gidaspow-model was mentioned?).

2. Furthermore, is there any other reason than stability for the limitation of the KSL-value?