CFDEM®coupling - User Forum

Dear CFDEM users,
I do not know why when I change the number of particles in CFDEM cases the results do not change in the Paraview.
I think it shows the previous results whereas the number of particles has been changed.
I would be thankful if you could help me to solve this problem.
Best,
Shadi

Hi,

I need to insert particles randomly, or at fixed points, in a limited number and at a very low rate (CFDEM case). I am currently using fix insert/rate/region command. Although it is to insert particles randomly, they are inserted too close to the center of the defined region. How can I insert particles in the whole region? (It is not because of the processor boundary. I use overlapcheck no.)

Hello everyone !

I have adapted "pair_style_colloid" and "pair_style_yukawa/colloid" from LAMMPS into LIGGGHTS (v3.8.0). The implementation works fine. I just want to know is it possible or does LIGGGHTS also calculates the interaction energy ?

I have gone through LIGGGHTS documentation and found some hints like using compute group/group command,
https://www.cfdem.com/media/DEM/docu/compute_group_group.html

Hello all,
I am a new cfdem user and I am interested to simulate a case with cfdem(solverPiso) in which a STL file as a gate moves up with a specific velocity.
I am wondering if it works or not?
Thank you.
Shadi

Hello,

Dear CFDEM community,
Does anybody have a simple example of radial flow? Wich soft was used for fluid grid construction?

Hi,

Hi all,
According to paper of Zhou et al. (2010) with title "Discrete particle simulation of particle-fluid flow: model formulations and their applicability" and using formulation set II, the coupling is explicit or implicit?
In Christoph Kloss's paper with title "Models, algorithms and validation for opensource DEM and CFD-DEM" it is said that momentum exchange term is
split-up into an implicit and an explicit term.
As I compared the paper of Zhou and paper of Christoph the formulation of momentum exchange term seem to be different.

Dear CFDEM community,

I am simulating a pipe flow using DNS-DEM with smoothing model since the particle size is larger than the mesh size. The model works fine as the predicted concentration profiles and velocities are in good agreement with experimental data. However, regarding the averaged particle velocity (Us) in a cell, smoothing for the Us is performed to “fill in” values in cells void of particles and values calculated in the cells (via Lagrangian-To-Euler mapping) are NOT changed, as suggested by the code

Hey,

I want to add the VORONOI package to the 3.7.0 CFDEM-coupling LIGGGHTS public.

So I sticked to the tutorials and installed voro++

sudo apt install g++
cd ~
wget http://math.lbl.gov/voro++/download/dir/voro++-0.4.6.tar.gz
tar -zxvf voro++-0.4*.tar.gz
cd $HOME/voro++-0.4.*
make all
sudo make install
which voro++
/usr/local/bin/voro++

then i changed the text file package-liggghts-list.txt like this: