Fluid-particle flow simulations

Submitted by tshan on Wed, 01/19/2011 - 07:02

Hi, Chris,

If I want to couple water flow and granular flow, is it possible for me to use your cfdem code?

Could you give me some suggestions? Many thanks for your kind help!

B.t.w., how to enable buoyancy?

Best,
Tong

cgoniva's picture

cgoniva | Wed, 01/19/2011 - 12:00

Hi Tong!

Water is just another incompressible fluid certain viscosity and density.
So no problem to model water with the CFD-DEM coupling.

Additional forces such as buoyancy can simply be added - via coupling properties they are activated.
All forces on the particles are superposed!
You need to write a new force - take diFeliceDrag as example.

Cheers,
Chris

tshan | Wed, 01/19/2011 - 16:29

Hi, Christoph,

Thank you for your quick reply!

With this initial coupling released, no problem to model water and granular flow? I am new here. Could you tell me how to set the certain density and viscosity and also how to let the water flow?

Thanks again!

Best,
Tong

cgoniva's picture

cgoniva | Wed, 01/19/2011 - 20:15

Hi Tong!

This is not specific to the CFD-DEM coupling, but a basic setting of the CFD-part of the coupling.

You will find plenty of information on that in the CFDonline forum.

The solver you have is a std. transient incompressible sover - you can change the viscosity in "transportProperties"

density does not exist, as the equations are divided by rho so pressure is in m2/s2.

Cheers, Chris

tshan | Tue, 02/08/2011 - 10:06

Hi, Chris,

I have seen that in the controlDict file the application is interDyMFoam, and does this mean that it uses the interDyMFoam solver to solve the CFD part of the simulation?

Thanks for your reply!

Best,
Tong

tshan | Tue, 02/08/2011 - 14:05

Hi Chris,

Is it possible to couple the interDyMFoam solver with LIGGGHTS or it has been done by you? If the answer is yes with the former, how to do this?

Thanks for your prompt reply!

Best,
Tong

tshan | Wed, 02/09/2011 - 08:10

Hi Chris,

That's great! Actually, I just want to pour some particles from the air into the fluid and get an acceptable result, and the interDyMFoam coupled with LIGGGHTS seems to satisfy my initial need. When and how can I get this version from you?

Another question, with this interDyMFoam solver coupled with LIGGGHTS, does the momentum transfer issue still exist? You told me how to avoid this issue such as coarser mesh, smaller delta T, smaller particle number and smaller density, but how to completely resolve this issue?

Look forward to you response! Thanks a lot!

Best,
Tong

cgoniva's picture

cgoniva | Wed, 02/09/2011 - 09:36

Hi Tong!

After some changes to the coupling (both on LIGGGHTS and CFD side) we'll come up with a new version. This will take some more months. You'll have to be patient.

I'll add a tutoarial case for interDyM as well.

Concerning the stability issue ... this is always a problem in CFD-DEM. We're working on several strategies. We could show that they work, but they are not ready for the release...

Cheers,
Chris

tshan | Wed, 02/09/2011 - 10:28

Hi, Chris!

Thanks a lot for your reply!

I am looking forward to the next version of CFDEM.

All the best to you,
Tong