A-17 Numerical Simulation of Bypass Transition by the Approach of Intermittency Transport Equation

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This paper deals with the development of a numerical approach to predict freestream-turbulence-induced (FST-induced) boundary layer bypass transition on vane and blade surfaces of turbomachines. An intermittency transport equation, which is critical for invoking transition onset according to Abu-Ghannam and Shaw correlation, is implemented into the proven Reynolds-Averaged N-S (RANS) solver constructed by one of the authors (Yamada) employing Wilcox's k-ω turbulence model. The newly developed code is carefully tested and tuned against ERCOFTAC test cases; the well-known benchmark using a flat plate with and without pressure gradient for various inlet freestream turbulence intensities. The code is then applied to the predictions of LP and HP turbine flow analyses. It follows from the detailed comparisons of the calculated results with the relevant experimental data and other researchers' simulations that the present code is capable to make a reasonable prediction of FST-induced bypass transition of attached as well as separated boundary layers, although further efforts seem to be necessary for attaining better agreement with the experiment for the cases accompanied with separation bubble.
公益社団法人日本ガスタービン学会の論文
2008-10-01