CFDEM®coupling - User Forum

Hi everybody! I'm new in CFDEM and I'm trying to solve some issues that I have on my simulation. The setup it's quite simple, a square box with three small inlets and one outlet. The particles are inserted on the top of the box and y want to visualize how they are transported by the fluid.

Hello everyone,

while modelling a periodic vertical pipe flow with the cfdemSolverPiso I am running into issues with the processor boundaries of my decomposed model. The CFD and the DEM components of my set up are running individually without any problems.

Hi all,

I am a new guy in CFDEM and currently interested in void fraction calculation and how it effect on fluid-particle interaction. I have looked at src/submodel for voidfraction calculation however not sure whether current solution considers overlap volume of particles or not? Could any one please clarify me this confusion? Additionally, I have tried using dividededvoidfractionmodel for several cases but it seems not be fully correct to my geometric calculation method. Do voidfractionmodels in CFDEM propose and accept any error or tolerance?

Thank very much,

Hello everybody!
I am going to use CFDEM in my project. I have some question about this package and its potential to simulate the complex shape.

I think the premium version of CFDEM is used to simulate multisphere object. Is that true? Means one has to pay to access this version of CFDEM?

But what about polygon geometries? At least it is possible to use LIGGGHTS, NOT CFEDM to simulate DEM modeling of polygon geometries?

Thanks!

hello everybody
i need help about simulating sand particle size distribution in a hydrocyclone (water/particle) in DEM. i need a good procedure for best simulating. my mesh file is designed in gambit. can i use this file? and can anyone introduce me a good procedure for working in this field?
a.goortanian

Dear All,

I am a newbie with CFDEMcoupling code, and I am trying to study the implemented models. At the present I am dealing with the "viscForce" model, and I have a question about how the "divTau" term is computed for compressible flows; the expression I found is the following:

divTauField =
- fvc::laplacian(mufField, U_)
- fvc::div(mufField*dev(fvc::grad(U_)().T()));

What I do not understand is why the "dev" operator is used in place of the "dev2" one.
Does anyone have a suggestion about it?

Hi all,

I am interested in using the fictitious domain solver 'cfdemSolverIB' for the simulation of large particles in a flow field. In my case, particle rotations may have a large impact on the fluid flow, so I am interested in modelling these physics.

Hi,
I used the alpha-equation:
( "MULES::explicitSolve(geometricOneField(), alpha1, phi, phiAlpha, volScalarField("Sp", fvc::div(voidfraction*U)),zeroField(), 1, 0) "),
after running the measures of max, min alpha was good but after entry particles in flow, the measure of alpha was very larger than 1 and very smaller than 0! and diverged finally.
I don't know why?

Elham

EDIT: See below the ***; these errors might not be important after all.
********************************************************************************
I'm trying to compile the CFDEM(R) Coupling package and am getting some errors reporting missing header files:
wmakeLnInclude: linking include files to ./lnInclude
Making dependency list for source file cfdemCloud/cfdemCloud.C
could not open file RASModel.H for source file cfdemCloud/cfdemCloud.C due to No such file or directory

Hello All,

Can someone please suggest where do i start (any tutorials or examples) to couple interFoam with LIGGGHTS.
I have simulated my particle phase using liggghts and gas and liquid phase using interFoam (OpenFOAM). I want
to couple them using CFDEM.

Any help will be much appreciated.

Regards,

Narendra