Numerical Simulation of the Transitional and Unsteady Flow  through a Low Pressure Turbine

Skoda, Romuald; Schilling, Rudolf; Schobeiri, Meinhard T.

doi:https://doi.org/10.1155/2007/10940

International Journal of Rotating Machinery

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Research Article | Open Access

Volume 2007 | Article ID 010940 | https://doi.org/10.1155/2007/10940

Numerical Simulation of the Transitional and Unsteady Flow through a Low Pressure Turbine

Romuald Skoda,¹Rudolf Schilling,¹and Meinhard T. Schobeiri²

Academic Editor: Shimpei Mizuki

Received09 Mar 2006

Revised26 Aug 2006

Accepted16 Oct 2006

Published17 Jan 2007

Abstract

A simulation strategy is developed for the computation of the time-accurate flow through low pressure turbines with periodically impinging wakes generated by moving cylinder rods. For the simulations, different time steps and turbulent inflow conditions and their impact on the laminar separation on the suction side are considered. A realizable cubic low-Reynolds number k-ɛ turbulence model and a linear V2F model are utilized to capture transitional effects, in particular the laminar separation bubble at the suction side. For comparison with experimental data, published in a companion paper, pressure distribution and boundary layer profiles of the mean and fluctuation RMS velocity are considered. While the periodically disturbed flow is predicted with a reasonable accuracy by each model, for the undisturbed flow, an additional realizability condition based on a turbulent time scale bound is incorporated into the cubic model in order to capture the reattachment of the flow.

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Copyright

Copyright © 2007 Romuald Skoda et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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