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NUMERICAL INVESTIGATION ON FLOW CONTROL BY COMPRESSIBLE TURBULENT WALL JETS (VERIFICATION OF TURBULENCE MODELS)

Kentaro Watanabe
Graduate School, Science University of Tokyo 1-3 Kagurazaka Shinjuku-ku Tokyo 162-8601, Japan

Kazuyuki Toda
Department of Mechanical Engineering, Science University of Tokyo 1-3 Kagurazaka Shinjuku-ku Tokyo 162-8601, Japan

Makoto Yamamoto
Department of Mechanical Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan

Sinopsis

If separation occurs in a flow field, it causes a large pressure loss and thus aerodynamic performance is largely reduced. A wall jet, i.e. tangential blowing, is one of the control techniques for such a flow field. However, the verification of turbulence models for a wall jet in compressible flow is insufficient. In the present study, we examine the predictive performance for five typical turbulence models (Spalart-Allmaras 1 eq. model, Lam-Bremhorst, Myong-Kasagi and Shimada-Nagano k-ε 2 eq. models and Craft-Launder-Suga k-ε-A2 3 eq. model). In the results, the k-ε models show a relatively good predictive performance and little difference of distributions among the models. On the other hand, Spalart-Allmaras and Craft-Launder-Suga models indicate the inclination to overestimate the size of separation region.