CFDEM®coupling - User Forum

Hi, everyone

I face a error when I used the command Fix insert/rate/region, and I don't know what is the reason, anyone could give me some suggestions?

Coupling...
Starting up LIGGGHTS
Executing command: 'run 5 '
run 5
ERROR: Fix insert/rate/region (id ins): 'start' step can not be before current step (../fix_insert.cpp:573)

I list the input as belowe

echo both
log ../DEM/log.liggghts
thermo_log ../DEM/post/thermo.txt

Hi everyone,

I have a problem as below,
In a 4 seconds long CFDEM run, I'd like a liggghts fix command (a fix addforce command) to be executed once at two seconds. Does anyone know how to realize it?
I have tried the liggghts command execute in CFDEM, but failed.
Any suggestion is appreciated.

regards,

Zhou Yu

Hi,

I have encountered one problem as follows: I use the Ubuntu 16.04 and OpenFoam of 3.0.0 version. Could anyone help me? I appreciate your help and time.

cfdemCompCFDEM

Any can help?

This is the log: https://paste.ubuntu.com/24342242/

I dont know if the compilation are fine.

see log: https://paste.ubuntu.com/24340600/

Why the "$WM_NCOMPPROCS = " dont show any numbers? How I can change this?! It's a problem?

Thanks

Hi all,

I installed OpenFOAM 3.0.x and compiled the latest version of LIGGGHTS with cfdemCompLIG without any problems. The cfdemSysTest looks as follows:

*********************************************
* C F D E M (R) c o u p l i n g *
* *
* by DCS Computing GmbH *
* www.dcs-computing.com *
*********************************************

Dear CFDEM enthusiasts,

I am currently running a simulation using the IB solver and I am experiencing very high computation times. Does anybody have experience in using this solver and can maybe tell me if this are usual computing times or if I am doing something wrong?

The simulation is running on 4 cores while the Computer posseses 128 GB of RAM. Around 400 particles are in the system but for 50 particles the simulation does not seem to run faster. I am using 4 cells per particle diameter.

Hi,
i meet one problem,for single particle settlement in water. The dragforce output from the program and the dragforce calculated using the final settlement velocity and Defelice theoretical equation are a little different. does anyone know the error (about2%) come from?
thanks a lot.

Hi,
i'm trying to compile CFDEM coupling, after having followed a tutorial found here. I successfully installed OpenFoam 3.0.x and the right LIGGGHTS version. But when i run the command cfdemCompCFDEM to compile CFDEMcoupling, i get this
NB it is just the first lines, but i think that here it is the problem!
Probably, CFDEMcoupling can't see OpenFoam, but it doesn't give me the error when i start the new terminal!

Thank you very much for helping,
Matteo

Hi,
I'm trying to install CFDEM 3.6.1 on a Red Hat linux V6.5, but I receive an error
collect2: error: ld returned 1 exit status
which I cannot figure what it actually means. I've also attached the cfdemSysTest and foamInstallationTest in case it helps.

I would greatly appreciate the help.
Best
Ali