CFDEM®coupling - User Forum

Hi,

Merry Christmas and Happy New Year everyone.

This is my first time to use ubuntu system and openfoam, i have installed OpenFOAM-2.2.x and it can work smoothly. But my purpose is to use the CFDEM coupling, and I tried some times but failed to use the CFDEM coupling sinulation.

Concering the postprocess of the simulation, i want to install these softwares one time, but have no complete step by step processures. Is there anyone could help me and give me a complete installation on mp ubuntu ?

Thanks very much.

Hello guys,
i have a problem the compiling of LIGGGHTS after typing the cmmand cfdemCompLIG.
It shows up an error which i dont understand. Here is a part of it.

I managed to add the lines correctly (referring to my 1st) post.

_________________________________________________________________________________________________________

Hey, i am totally new in CFDEM and i have already problems with the installation of CFDEM. i followed the instructions on githubAccess_public.pdf but there is still a problem:

after i updated CFDEM coupling (which was not needed to be updated) i wantedt to set the environmental variables. i followed the instructions and add the lines in the ~/.bashrc but there is still the message that there is no directory after i typed in the other commands:
$CFDEM_PROJECT_DIR
$CFDEM_SRC_DIR
$CFDEM_LIGGGHTS_SRC_DIR

what went wrong? i appreciate your help and advices!

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