CFD and DEM - General Discussion

How can I rotate a region created by intersecting other regions? I know this can't be done directly, is there a way around it?

Many thanks

Dear all,
I am new at CFDEM. I've been having trouble understanding the meaning of weight and porosity in the bigParticle model.
I have tested several cases with lots of combinations between these two parameters and I've observed that they have a huge influence on the final result. Moreover, when I change the mesh refinement, the values that I've used for weight and porosity have a different effect on the simulation.
So, the best way to resolve this issue is to try to estimate the values instead of randomly try them until my result is good enough.

Dear all,

I am working on the numerical implementation of a lateral capillary force model (Kralchevsky, P. A., et al. (1994). Langmuir 10(1): 23-36. Eq. 1.28) into LIGGGHTS, which is a little bit different from the conventional liquid bridge capillary force model which has been implemented in LIGGGHTS.

Hi,

I need help from someone to set forcechain line width along with its magnitude in Paraview. I use forcechain.vtk file from Liggghts to view the forcechain in Paraview. First, I select Cell data to Point data and then use Tube filter. I select Vary Radius by scalar and set the radius factor. Using this method I found that the forcechain line width does not align with its magnitude. Can someone help me how to solve this?

when i checked in git it is showing this ......word OFversion="5.x-commit-538044ac05c4672b37c7df607dca1116fa88df88"; does this mean openfoam5.0, i am unable to complile cfd dem with of5.0....please help.
Thanks

Hello everyone, I tell you that I am a new user in LIGGGHTS, and I am working on a program modeling a system consisting of a belt, barriers, box and board. In the latter, the particles fall to the belt that moves at 5 m / s, where they are finally deposited in the box. However, the program does not run, because the following messages appear:

"0 atoms group group" ... .. (does the "group" command work correctly?)
"Error on proc 0: Too many neighbor bins (../neigbor.cpp:1776) .......... (What happens to the neighbors?)

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Hello guys

Is it possible to simulate the turbulent flow of gas and solids inside a pipe with CFDEM?
Since it's turbulent flow, the cell size near to wall should be very small and it's less than particle size. How CFDEM deal with it when calculating void fraction in each cell? in other words, can a cell size be smaller than particle size in CFDEM?
I would really appreciate if you could help me with this problem.
Thanks
Esi

Hi Philippe,

I am new to DEM-LBM world and have the following questions regarding LBDEMCoupling:-

1) Can LBDEMcoupling be used for densely packed particles? I read it somewhere in your papers mentioning that the algorithm assumes that only a single sphere is present in each cell and could lead to inaccuracies for dense suspensions?

2) Can it be used for particles with varying sizes? I could see all the examples available only for one sized particles.

Thanks for your help.

regards,

Shay Haq

Greetings,

I am confused when I use the command: fix freeze.

I'm aiming to build a compression model. I want to build the top cover and bottom plate as the granular wall(the wall is made up of particles by read_data). I use the "fix freeze" command on the wall particles. I fix the movement of the bottom plate, and let the top cover free. Random particles are inserted in the region between two plates.