Abstract
High levels of performance have always been economically and environmentally important for practically all turbomachinery applications. Before the advent of computational fluid dynamics (CFD) analysis methods for turbulent flows, designers use to achieve these high-efficiency levels using experimental, empirical, and semiempirical methods. This chapter reviews state of the art in validation of turbulence models for internal flows in turbomachinery based on current work in the thematic area 6 (turbomachinery internal flows) within the EU–Network QNET–CFD. The chapter also discusses about the available databases for validation of turbomachinery flows and also describes the approach within QNET–CFD, which is based on a mixture of real test cases and simpler underlying flow regimes, with strict quality control procedures for their selection. Furthermore, the chapter describes several issues and difficulties related to turbulence modeling in turbomachinery. The extreme complexity of turbomachinery flows ensures that even the most recent and advanced turbulence models are not satisfactory for predicting the details of the unsteady turbulent flows that occur.
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