On the Development of Viscous Solvers for Computation of Transient Flows in Turbomachines

Abstract

This paper focuses on development and validation of a viscous solver for the computation of unsteady flows in turbomachinery blade rows and stages consisting of rotors and stators. The code has been evolved from steady-state single flow solvers developed by Wiedermann based on time-marching finite difference schemes. A two-equation eddy viscosity model is applied, and the wall boundary conditions are determined by the y+-distance of the first grid line away from the wall. For the solution of transient flow fields the original time-stepping algorithm is replaced by a time-accurate scheme.

Keywords

• Unsteady Navier-Stokes computation
• Blade-row interaction
• Code development
• Validation
• Turbulence models.