CFDEM®coupling - User Forum

Hello,

I am going through the void-fraction tutorial example and found this keyword useDDTvoidfraction in the coupling properties. Can someone briefly explain what role does that play and what its options are. In the file I'm looking at, it has
useDDTvoidfraction b

I can't find the source-code associated with it, neither any documentation.

Thanks.

Yesaswi.

I’ve just installed CFDEMcoupling and OpenFOAM guided by the steps listed in the current CFDEMcoupling online manual.

What is the best way to test the installation?

What is the best path for teaching myself OpenFOAM and LIGGGHTS simulations?

Thank you very very much for any help.

Hello,

I am printing results from OpenFOAM and LIGGGHTS at the same frequency, so that when I view them in paraview, I can import the CFD files (results.foam) and DEM files (dump*.liggghts_run), and animate both the flow and particles together.

Hello,

I am going through the ErgunTestMPI_restart tutorial and found that in the controlDict file (), the application is set to pisoFoam instead of cfdemSolverPiso. This is the file, I'm referring to: https://github.com/CFDEMproject/CFDEMcoupling-PUBLIC/blob/master/tutoria...

Hi,

I am now facing a strange problem with my simulation. I have successfully run my CFDEM code for more than 12 sec with the courant number to be about 0.01. However, in the following step after time 12.2965s, the courant number suddenly increased to more than 1000 and stopped after several step and my particles also left the calculation region in a few steps. I didn't change any boundary conditions during this simulation, why could this sudden stop happen?

Dear CFDEM community,

Currently we are simulating particle-laden flow in a pipe using DNS-DEM or LES-DEM. The coarse particles we are using are bigger than the CFD cell. When considering the unresolved approach, we tried the GaussVoidFraction model, but got the following error

Selecting voidFractionModel Gauss

W A R N I N G - do not use in combination with differentialRegion model!

[2]
[2]
[2] --> FOAM FATAL ERROR:
[2]

This model does not yet work properly - Eqns need to be revised!!!

I am working on establishing a simulation environment on my Windows 10 machine using the Ubuntu environment. The simulation I need to achieve requires the movement of particles (~8.0mm dia) by air. My understanding is that I need to install LIGGGHTS, CFDEMCoupling and OpenFOAM. Please correct me if I'm wrong on that?

Hello,

I actually try to extent a Liggghts simulation to a coupled simulation with CFD. In my Liggghts simulation I got a rotating disk, where the particles lay on. Furthermore I ve got a translating lid, which is adding a force onto the particles.

I now tried to add a fluid around the disk, so the particles run in this fluid. Now I face the problem, that the coupled simulation does not identify the moving STL-files I mentioned above.

Hi,

I am recently focusing on a particle cube system with a constant confining pressure, e.g. 50kPa. In my first code, I only use LIGGGHTS to exert this confining pressure and obtained the target pressure and void ratio. Then I write a restart file so that to restart the results in a CFDEM coupling procedure.

However, when I applied the restart file into a CFDEM procedure (the sample just be immersed in the hydrostatic water), I found the void ratio of my sample decrease sharply at a very instant time. I cannot figure out why this could happen.

Hi,
Please help me out.
I have installed VTK 8.1.0 version.

When I run cfdemSysTest and separately cfdemCompCFDEMall, following message coming.

$ cfdemSysTest

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