CFDEM®coupling - User Forum

Hello everyone,

is it possible to use the LIGGGHTS features "deforming meshes" and "stress controlled wall" also in CFDEM based simulations? Or is these only limited to LIGGGHTS only simulations?

Thank you all and Regards,
Patrick

Hello everybody
I want to simulate oil spill in sea water that contains ice. what kind of methods you propose?
Regrads

Hello everyone,

I want to simulate a 4-way coupled case with mesh motion. Does the public version of CFDEM supports GGI mesh motion feature ? If not, would it be possible to simulate this case in public version of CFDEM ?

Thanks and Regards,
Aashish Goyal

Hi, everyone

Hello，
I‘m a beginner of CFDEM®coupling and only have experience of Openfoam. I wanna simulation the solid-liquid two-phase flow in a pipe by CFDEM®coupling. Is there any case of solid-liquid two-phase flow in a pipe?
I am confused about the mesh import in the cfdem case. It's same with openfoam?
And It seems that in all tutorial example, parallel operations have been taken and the meshes have been split. Can I run the case sequential and how?
Thanks,
Scoop

Dear all,

recently, I faced a problem with CFD-DEM coupling.
both in.liggghts_init and in.liggghts_run need to define "mesh/surface" . I defined wall using STL files located in folder "meshes", the commends are as follows:
fix cv all mesh/surface file meshes/wall.stl type 1 #surface_vel -4.5 0. 0.
fix bx all mesh/surface file meshes/inlet.stl type 1
fix inface all mesh/surface file meshes/outlet.stl type 1
fix wall all wall/gran model hertz tangential history mesh n_meshes 2 meshes bx cv

Hello,

I'm trying to solve the heat transfer problem for a static particle bed with interstitial air. The particles are bigger than the mesh used for the CFD solution. From the source code, I see that the heat exchange field (EuField in cfdemSolverPisoScalar.C or the Tsource in cfdemSolverPisoScalar.C) is just being added to the CFD cells that coincide with particle centroids. But Tsource in all the other cells that also occupy this particle is being taken as zero.

I am wondering why not use a smoothing model to distribute this Tsource?

Hello everybody,

This is a simple question about the engineSearchIB used for cfdemSolverIB. When dealing with a large number of resolved particles, the findCell() function takes a large amount of time. There is the option to use treeSearch but it has been recommended to keep the switch off for resolved CFD-DEM. Is there any possible reason why treeSearch cannot be used in cfdemSolverIB?

Bests,
Achuth

Hi I want to do cfd analysis of a pebble bed reactor for this I need random packing of spheres in a rectangular canister. For this I performed a Liggghts simulation to create a particle bed I have the particle position text file. How can I use this to create a Cad model . I want to use that in open foam . From some where I read that I have to write a c++ code for this .how can I do that Can somebody help?

Dear CFDEM experts,