Void fraction models (Big-particle & Divided) implemented simultaneously together in Single CFDEMcoupling Case

Submitted by ksbiefr on Thu, 10/13/2016 - 15:54

Hello!

I have a very general question Specially for Developers....
Can we use two Void Fraction models (Big-particle & Divided) simultaneously together in Single CFDEMcoupling Case.
I believe that it is only possible, if two separate "couplingProperties" files (couplingProperties_Big & couplingProperties_divided) are prepared/used according to case requirements .

Please Developers correct me if i am Right ?

Second question, If i am right either i have to change all directories present in /src/lagrangian/cfdemParticle with "if" statement
or
Could you please guide me which (*.C & *.H) files needed to be updated with "if" Command.

Regards,
Khurram

Forums:

j-kerbl's picture

j-kerbl | Thu, 10/13/2016 - 16:24

Hi Khurram,

I am sorry, but it is not possible to use two void-fraction models at once. Even if it was possible, the results would certainly be highly unstable.

May I ask, what is it you want to achieve exactly?

Cheers,
Josef

P.S.: Do NOT double post topics in two forums!

ksbiefr | Thu, 10/13/2016 - 17:24

Hi Josef,

I was wondering, if i can try to generate different size of particles in a channel.
Or if you suggest any other alternative way to test this thing in CFDEM coupling.

Regards,
Khurram

j-kerbl's picture

j-kerbl | Mon, 10/17/2016 - 10:30

Hi Khurram,

sure you can have different particle sizes. How big is the size-difference? How big are the particles compared to the CFD cells?

Cheers,
Josef

ksbiefr | Mon, 10/17/2016 - 12:57

Hi JOSEF,

Big particle to small particle ratio is around 30 and Channel Diameter to Big particle ratio is approximately 1.33.
Big particle covers around 3000 plus CFD cells.
My main concern about selection of void fraction model either Big particle or IB .... for generating more than 10 thousand particles.
So could you please suggest me which is better option for large number of big and small size particles in single simulation.

Regards,
Khurram

j-kerbl's picture

j-kerbl | Mon, 10/17/2016 - 13:54

Hi Khurram,

to me this sounds like a VERY demanding IB simulation. However it always depends on the physical effects you want to see.
So there is no "better" model.

Cheers,
Josef