[saravana]

Hi All,

I need to do cfx simulation for Impellar type fuel pump.
It has five domains.
1. Inlet Domain (unsymmetry)
2. Axial Clearance - Inlet side Domain (symmetry)
3. Blades Domain (35 fluid blade volumes spread out for 360°)
4. Axial clearancee - Outlet side Domain (symmetry)
5. Outlet Domain (unsymmetry)

Both in the top and bottom extreme (Inlet and outlet Domain) is circular sector volume and is not a symmetric geometry.
Next to those domains is axial clearances, which is a symmetric (complete circular volume) Domain.
In between these axial clearances, 35 impeller blade fluid volumes spread out for comple 360°.

My question here is that, is it possible to simplify the model with only one blade instead of complete 35 blades, considering the fact that the domains these blades is going to have domain interface (Axial clearances) is uniform for 360°. But the other two domains (inlet & Outlet) are not symmetry.

Please give your suggestions.

Saravana

[Far]

But the other two domains (inlet & Outlet) are not symmetry.

But It has the periodicity ever where, use periodic condition at the interface between two blades

[saravana]

Thanks for your reply Mr.Far.

There will be no interface between blades.
There will be interface between blades and axial clearances in both top and bottom directions.
My dought is that, to have periodicity, do we need to have all the domains symmetry?

Saravana

[Far]

that is imaginary interface or plane created by the CFD user. This plane is approximately between two blades and then same is copied to other side of blade by the angle 360/35 (for your case) and then we give them periodic condition in CFX pre. In this way you have to only solve one passage and get the solution for whole impeller

[Far]

can you please post pic of impeller