CFD and DEM - General Discussion

Dear everyone,

I'm working on a coupling case and I want to investigate the influence of fluid properties.

When I use water to couple with particles, the result is fine. However, after I change the water into a HerschelBulkley fluid, the code cannot run any more.

After the timestep is adjusted, the code can run. But still, the result is quite strange.

Is there any coupling problem due to the change of fluid property?
Is the divergence related with the viscosity of the fluid?

Many thanks for your attention.

Regards,
Moon

I always find the forums in this website very interesting. It is good for learning, for preparing one ahead of possible problems, and more importantly it is indeed important for those who are active to answer the queries.

However, one has to visit forums one by one. There is no means of getting notifications/mails/posts/updates. Like it happens in case of a mailing list and for several other type of forums.

Is there a way to enjoy such feature or is there any plan to implement such thing?

hello every one
i have one problem with granular that is Contains 9% moisture.now i dont know what pair style should be use.Please help if possible.
thanks a lot.

Hi All,

There is a QQ forum with number of 109526446, we are going to discuss the problems you might have during using openfoam, liggghts, and cfdem et.al. Please join us with your name and major. Looking forward to your participation!

Thanks,

Kun

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

Hello,

We are using OpenFOAM release version 2.2.2 and would like to know if it is compatible with the latest public releases of CFDEMcoupling and LIGGGHTS? If not, could you please provide some guidance which releases of CFDEM and LIGGGHTS would be most compatible with this version of OF?

Thanks kindly for your time and consideration.

Dave Hesse
TotalSim

Hi everybody,

how is the acceleration of velocity calculated for every time step in LIGGGHTS?
Is it the same way like in PFC (using the central difference quotient)?

Dear all,
Hi
I am a PhD student at university of Tehran, I am searching about an opensource DEM-CFD program for studying micro mechanical characteristics of contacts,
my major is geotechnical engineering, I have a modified Trubal program that have micro mechanical subroutines and my first choice is to find a Trubal saturated version, an opensource Trubal code that is coupled with a CFD program,
I will be grateful if any one could help me by this matter,
Bests
Talat Foroutan

Hi

I am considering doing Masters research in geotechnical engineering. Does anyone have a suggestions for a research topic involving a commercial/practical application of DEM or (DEM-FEM coupling) in geotechnical engineering (including waste landfills)?

1
How does CFDEM calculate particles force on fluid cells?

As I understand , For calculating Drag force on particles we should at first obtain " inter-phase momentum transfer coefficient due to drag" which is shown in Kochhill drag by "betap".