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International Journal of Rotating Machinery
Volume 2007, Article ID 10940, 11 pages
Research Article

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

1Institute of Fluid Mechanics, Munich University of Technology, Garching 85747, Germany
2Turbomachinery Performance and Flow Research Laboratory, Texas A&M University, College Station, TX 77843-3123, USA

Received 9 March 2006; Revised 26 August 2006; Accepted 16 October 2006

Academic Editor: Shimpei Mizuki

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.


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.