Numerical simulation of complex 3D compressible viscous flows through rotating blade passages

Abstract

This paper describes a three-dimensional compressible Navier- Stokes code, which has been developed for analysis of turbocompressor blade rows and other internal flows. Despite numerous numerical techniques and statement that Computational Fluid Dynamics has reached state of the art, issues related to successful simulations represent valuable database of how particular technique behave for a specific problem. This paper deals with rapid numerical method accurate enough to be used as a design tool. The mathematical model is based on system of Favre averaged Navier-Stokes equations that are written in relative frame of reference, which rotates with constant angular velocity around axis of rotation. The governing equations are solved using finite volume method applied on structured grids. The numerical procedure is based on the explicit multistage Runge-Kutta scheme that is coupled with modern numerical procedures for convergence acceleration. To demonstrate the accuracy of the described numerical method developed software is applied to numerical analysis of flow through impeller of axial turbocompressor, and obtained results are compared with available experimental data.