[Tensian]

Hi everyone,

I would like to simulate a two-phase flow using Euler granular model (liquid as a primary phase and solid particles as secondary phase)

I am able to make the set up of the model, but one question is getting me crazy. I need to establish my solid particles into an enclosure, in such manner that liquid enters this enclosure and exits, but solid particles are not allowed to leave the enclosure. In some way is similar to a filter, but the solid particles are moving inside the enclosure with no chance of leaving it (at the end particles are bounded by two filters).

Have anybody done something like this? I have read about porous conditions, but it seems there are a lot of parameters to set. I am not sure, but, does packed bed option do the work? I have read it is used to freeze velocities of the granular phase. But does this means that particles are always inside the area between the two filters?

I am quite stuck on this, so any help will be great.

Regards,

Tensi

[Tensian]

Well, after a bit of research and trials, I think I can answer to myself. Hope somebody found this interesting.

Two methods (at least) are available for solving this situatin in Ansys FLUENT.

1. Porous media approach: Fist of all, a cell zone is need to be defined. After that and based on particle diameter and porosity, resistance and inertial coefficients can be set. This allows to simulate the particles in the enclosure via a porous media approach.

2. Euler method: The most complete (and also time consuming) method. A granular phase is need to be defined for the solid phase. Also packed bed should be enabled. Later, when defining Cell zones, the fiex value option should be enabled, fixing the velocity to 0 for the solid phase IN ALL ZONES WHERE THE SOLID PHASE IS LOCATED. At first my solid particles were moving outside the enclosure and I cannot explain why. The reason was that outside the enclosure solid particles are allowed to move. Setting fixed values for solid particles to 0 solved the problem

Hope somebody found this procedure interesting.

Regards,

Tensi