Numerical simulation of unsteady flow in centrifugal pump impeller at off-design condition by hybrid RANS/LES approaches

Abstract

A new kind of hybrid RANS/LES turbulence modeling method - SST based SAS model is first time used for studying the stall phenomena in a centrifugal pump impeller at off-design condition in present paper. The previous reported "two channel" non-uniform flow structure has been gotten with this model. The numerical result is compared with LES and unsteady SST model, also the PIV result in reference paper. The time average result of flow show good agreements in general. The difference in turbulence quantities will affect the time average field in high turbulence intensity area to make SAS having close to LES. To achieve this effect, more computation consumption has been taken. © 2010 Springer-Verlag.