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research-article

Effects of surface waviness on the interaction of oblique shock wave with turbulent boundary layer

[+] Author and Article Information
Saddam Hossain Joy

Department of Mechanical Engineering Bangladesh University of Engineering and Technology (BUET), Dhaka-1000, Bangladesh
saddamhossainjoy@me.buet.ac.bd

Saeedur Rahman

Department of Mechanical Engineering Bangladesh University of Engineering and Technology (BUET), Dhaka-1000, Bangladesh
saeed@bme.buet.ac.bd

A. B. M. Toufique Hasan

Department of Mechanical Engineering Bangladesh University of Engineering and Technology (BUET), Dhaka-1000, Bangladesh
toufiquehasan@me.buet.ac.bd

1Corresponding author.

ASME doi:10.1115/1.4038214 History: Received April 15, 2017; Revised October 11, 2017

Abstract

Present investigation deals with the interaction of an incident oblique shock wave on a turbulent boundary layer over a wavy surface. The oblique shock wave was generated by a 8° wedge in a free stream Mach number of 2.0. Three dimensional Reynolds averaged Navier-Stokes (RANS) equations with k-? SST turbulence model were used for numerical computation. The computed results are in good agreement to the experimental measurement and DNS data in case of the interaction of an oblique shock with plain flat plate. To identify the effect of surface waviness on shock-wave/turbulent boundary-layer interaction (SWBLI), a section of the flat plate was replaced by a wavy surface. Computations have been conducted for different magnitude of wavy amplitude. Further, the wave length of the wavy surface has been varied. Results showed that the presence of wavy surface induces supplementary shock and expansion waves in the flow field which are referred as topographic waves. This supplementary system of waves interacts with the counterpart of intrinsic SWBLI in a complex manner. Flow structure, separation behaviour and aerodynamic characteristics are studied. It is revealed that the amplitude is dominant than the wavelength of waviness in case of SWBLI on a wavy surface.

Copyright (c) 2017 by ASME
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