has somebody got excellent results using cfdem?

Submitted by Oliver.pasqual on Tue, 11/22/2011 - 06:01

Dear CFDEMers,

I am exciting to join this project from another open source software-MFIX.
From google, some useful materials on the coupling have been got.
Several weeks's efforts on the test didn't show me a approving result compare with the result of MFIX.
Has somebody of this forum got some excellent results using cfdem?
perhaps some meaningful suggestions and experience on the use of this project you give can ease our life.

Thanking you in anticipation for answer.
Best,
Oliver pasqual

Forums:

openfoam | Tue, 11/22/2011 - 08:20

I have the same trouble when I use CFDEM to simulate the gas-solid flow in a fluidized bed. The result always cannot be consistent with the experimental data( The minimum fluidization velocity or any others). I think there must be something wrong with the coupling settings.
And I google some case like that, too little information I got. I'm in stuck.
I really wish someone can share a case which got excellent results, so I can find what happend about my settings

cgoniva's picture

cgoniva | Tue, 11/22/2011 - 18:51

Dear CFDEM users,

coupled CFD-DEM simulations is far from being easy as it combines two different worlds of simulation (CFD-DEM).
Consequently it needs lots of experience in "both worlds" to achieve reasonable results!
As applications vary enormously, there cannot be a simple "how to solve any possible problem".

The development crew is working eagerly to develop/maintain and provide an open source tool to you!
We permanently test the code against experiments and thus try to improve the quality of its results. Our tests have been published at some occasions and will further be published. So far we are very confident that the code works very fine and is a powerful toolbox!

We will try to provide to you more testcases to help you setting up a coupled CFD-DEM simulation correctly.

We highly appreciate the input and contributions of the users who really help bringing this code to a next level - this is how open source works - Thank you!

Chris

rqwang | Tue, 11/22/2011 - 20:19

Hi Chris,

Thank you for your reply.

Is it possible to have a collection of published CFDEM papers on this website?

Which paper should I cite in reference if I want to publish my own CFDEM paper?

I think I am close to finish my validation case.

Thanks.

rq

cgoniva's picture

cgoniva | Tue, 11/22/2011 - 22:17

Hi rq,

We've got two journal papers covering CFDEM currently submitted (but not jet published) - it would be great to cite those.

I'll come up with the references tomorrow.
(node/638)

Cheers,
Chris

skyopener's picture

skyopener | Tue, 11/22/2011 - 16:11

Hi pasqual,
you will find some satisfying compare in the developer's paper.
I have the same problem with you especially the prediction of minimum fluidized velocity.
several months' tests have made me unconfident.....
although satisfying results havn't been got, some experiences have been got.
In the coupling process, several tips you should pay attention to:
1. the ratio of grid size and particle diameter should be a suitable value.
2. the correct value of the material's properties, such as Young and Possio ratio.
3. the smaller of the time step(both fluid domain and DEM), the better the result will be.
4. a large calculation time should be taken, such as 1 second or more. perhaps you can't capture the fluidization with a small value.
hope other people to share their experience and their concern on the use of cfdem.....
S.L

cfdsam | Wed, 06/19/2013 - 12:21

Hi all,
Are recent release of CFDEM results far from test cases in Fluidized bed simulation yet?
Any idea about this will be appreciated. Is CFDEM better than MFIX?
Regards,

cfdsam | Fri, 06/21/2013 - 21:11

Thanks Chris,
I read your nice paper, after congratulation i have two questions:
1- Is the rolling effect considered in recent released version of CFDEM? if yes, where can it be seen or activated?
2- In particle collision, which one is used in your paper? Soft sphere or Hard sphere model. Where are these models in CFDEM?
Regards,