i want to get detail information about

1)Different between Euler-euler approach and Euler Lagrangian approach

2) For euler granular multiphase, why choose model K-e but cannot use RNG k-e and Reynold stress model??

3) I'm using FLUENT version 4.56. SO how to calculate

(a) Fluid primer velocity using PEA

(b) Pressure correction from continuity equation

for fluid

(c) Volume fraction of phase and solid velocity

(d) correction pressure for solid, solid velocity,

fluxes and solid volume fraction

Hi,

1)Euler-Euler is for dense particle flow.I mean , the effects of interaction between phases can not be negligible. So this model calculates this interactions and Euler-Granular model as well . In this case , the volume fraction of particle phase is more than 10-12%.Granular flow is more high.

Euler-Lagrangian approach(DPM) is for dilute particle flow. So this model doesn't calculate the interaction of particles.

2)There is no(or less) theory for the higher turbulence scheme

3)There is some tutorials.

Thank you

FJ

if i have one fluidized bed column, with 1meter's high and 0.6m's width. the bed height is 0.1meter. The diameter of particle (sand)is 63.29 mikrometer and the density is 2500kg/m3. while the primer phase is air with density 1.2kg/m3 and viscosity 1.85e-05. So how to calculate the volume fraction? is it consider as euler granular multiphase? The air flow from the bottom of the column an exit at the top of the column

where should i get the tutorial for all the calculation that i mention in (3)Can u tell me?

Hi,

If your problem is fluidized bed calculation , we have to choose only Euler-Grnular model.

About the volume fraction of this bed, I think it is less than 0.63 if the particles diameter is uniform at least. But this condition depends on your problem.If you don't know, nobody knows. Inlet volume fraction of air becomes one(I mean , the granular phase becomes zero, as you know).

Thank you

FJ

Hi,

To go FLUENT USER SERVICE CENTER(www.fluentusers.com),you can get it.

Thank you

FJ

1) Euler-euler approach considers phases as continuum interpenetrating media, which interacts through a term of drag. A continuity and a momentum equation are solved for each phase.

In Lagrangian approach a momentum equation is solved for each particle, in order to calculate its path.

So, Lagrangian approach is really expensive in term of computational resources, so it is suitable only for diluite systems. Eulerian approach can be applied to flows with a higher particle load.

2) RNG k-eps model is available in FLUENT 6 for multiphase flows.

Hi

ap

[mohsen0488]

hi every body
why i can't open "fluent user service" site?
what's the problem?

Thanks in advance