CFDEM®coupling - User Forum

Hi,

Did anyone install CFDEM in SUSE Linux Enterprise Desktop 15 ? Is the installation procedure same as mention in the CFDEM website https://www.cfdem.com/media/CFDEM/docu/CFDEMcoupling_Manual.html#install... ?

regards,
Hossain

Hi,

Hi,
I am now using the CFDEM for modelling the soil erosion.

As far as I know, the void fraction of the CFD cell, which is the particle volume in each CFD cell, is calculated with the particle information like particle size and location. I'd like to edit the void fraction manually with consistent ratio.
For example,
If the values of actual void fraction are 0.1, 0.2, and 0.3, then I like them to be 0.2, 0.4, 0.6.

Is is possible to adjust the void fraction value manually with consistent ratio?

Thanks in advance,

Soo-Min

Hi,

I'm experiencing some odd behevior of particles at insertion and can't figure it out. I've changed refined my surface stl mesh and that does not seem to help. I've also changed the random seed around to see if that is what is causing it. This is odd to me because I've inserted with a surface in the past and have not experienced this behavior. See attached for a photo and also my input file. I'm currently running pure DEM with the case to determine the root cause. Any help will be greatly appreciated.

Thank you,
Dustin

Hi, I apologise in advance for the very basic question. I have been doing CFD-DEM simulations with Fluent for a few years, and for some reasons I wanted to try something else. However, I know nothing about Openfoam and LIGGGHTS, and by merely reading the CFDEM installation instructions, I don't really understand what I am supposed to do to start a simulation. Are there resources or something for someone who basically knows nothing about this simulation environment (aside for the physical theory and equations)? Thanks.

Hi All,

Can anyone please share input sample script for Bubbling fluidized bed problem.

Thanks,
Rahul

Hi ,
I am working on carbon particles in order to use them as the slurry flow in the battery. The size of the carbon particle is between 1 to 10 Micrometer and they will place in water in a microchannel.
Considering that a part of my studies before doing my experimental investigation is a numerical simulation, I've decided to simulate the behavior of particles and the effects of fluid flow on charge and discharge of the battery.

Dear all, I have a really basic question regarding the settlingTestMPI tutorial. As far as I understand it simulates the settling of a sphere in a still fluid and compares the simulation results with the analytical Stokes (creeping flow) solution. But I can't find a reference (paper) of the expressions used in the .m scrip. I understand that It performs and explicit integration of the position but I cannot find a reference of the velocity determination.

I've attached bellow the octave script.

Cheers,
Mauro

Dear CFDEM users,
I am running a case in which an STL file as a gate moves up a specific distance and after it stops. So I need to use restart CFDEM.
However, I faced with this error:
Mesh elements have been lost / left the domain. Please use 'boundary m m m' or scale/translate/rotate the mesh or change its dynamics
I modified liggghs command and coupling properties like Erugan_resatart but I do not know why the gate does not stop.
I would be thankful if you help me to solve it.
Best,
Shadi

Dear CFDEM users,
I am working on a case in which I need to use restart CFDEM.
In the case I need to move up a STL file and stop it and running the case with the stoped STL file.
So I did :
First, loading the particles(liggght-init)
Second, using an STL file as a gate which moving up till t=0.05(liggghts_run)
Last, running the case without the gate. (liggghts_restart)
I have a question regarding the controlDict which controls the running time.