CFDEM®coupling - User Forum

Hi everyone,

Is there any method to run a test without using "bash Allrun.sh"? I could not use a "gnome-terminal " code and I got an error with "Trying to use the dummy Pstream library. This dummy library cannot be used in parallel mode". Therefore, is the test could run through other command instead of using "bash Allrun.sh"?
Any suggestions would be appreciate.

Hi,
I am trying to run a simulation like the three phase ball mill from CFDEM_currentState_Goniva_0.pdf p23(http://cfdem.dcs-computing.com/?q=system/files/CFDEM_currentState_Goniva...).

But this PDF is not easy for me.

So, is there any other useful tutorial case or tips to do this?

Thank you
Jun

Hi Alice,

I found the ShirgonkarIB force might be n times of the needed, where n=number of processors. Could you help me check it? If necessary, I can post my case later.

Thanks.
rqwang

Hi everyone,

I tried to install liggghts and openfoam on multicore computer. I followed the instruction from the forum: http://cfdem.dcs-computing.com/?q=node/1575 and it works on my one core computer. When i did on 4core computer. some thing wrong:

Create time
Decomposing mesh region0

Create mesh

Calculating distribution of cells
Selecting decompositionMethod simple

Finished decomposition in 0.01 s

Calculating original mesh data

Distributing cells to processors

Hello everybody,

i started a simulation with 3 fractions of particles of different density (800kg/m^3, 1000kg/m^3, 2000kg/m^3, ). In the CFD part, the density of the fluid is equal to 1000 kg/m^3 and nu = 1.3e-6 in a newtonian fluid.

I expected that the particles with a density of less than the density of water are swimming on the top. But all particles are sinking to the ground. Do I have to use a other force model? It is like i get no lift force. But if i set the density of a particle with the radius 1 to rho = 5kg/m^3, this particle will swim on top.

Hi,

I might find a bug in cfdemSolverPiso.C and momCoupleModel/implicitCouple/implicitCouple.C

In cfdemSolverPiso.C
should Ksl.oldTime().internalField() = particleCloud.momCoupleM(0).impMomSource();
be Ksl.internalField() = particleCloud.momCoupleM(0).impMomSource(); ?

and in momCoupleModel/implicitCouple/implicitCouple.C line 164
tsource() = KslPrev_;
should be tsource() = KslNext_;?

Thanks.
rqwang

twoSpheresGlowinski

Hi

I am getting confused between the Mei/Saffman lift force and the "viscForce". As far as I can tell, they both depend on the fluid velocity gradient. So won't using both the Saffman force and the viscForce include the same effect twice? Or do they act in different directions?

Can anyone explain what the differences are?

Thanks
Evan

Hi,

I want to know is it possible for me to simulate fluid flow thorough porous media?
If yes, how can I do that?

Thanks for the response in advance.

Hi Chris,

i modified the OpenFoam solver pimpleDyMFoam where the CFDEM scheme is added. It works fine as the orginal solver cfdemSolverPiso, however when i changed in the dynamicMeshDict staticFvMesh ----> dynamicRefineFvMesh, to refine the mesh of certain field, it seems the locateModel can not find the particles after the mesh is refined.

So I wonder, how can we locate the particles in the new refined Mesh?

Best regards,

David