Streamwise Relaxation of a Shock Perturbed Turbulent Boundary Layer
Compressible, high speed flow fields have benefited greatly from the emergence of enhanced supercomputer power and the associated ability to accumulate vast amounts of data. This is particularly true of high speed wall-bounded flows with embedded shocks w
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Streamwise Relaxation of a Shock Perturbed Turbulent Boundary Layer M.F. Shahab, G. Lehnasch, and T.B. Gatski
6.1 Introduction For more than four decades direct numerical simulations (DNS) have been performed on an ever increasing range of compressible flow fields. Such large scale simulations, that rapidly generate massive volumes of data of various types and that need to be stored in a very low density format, require big data technologies and architectures. These technologies and architectures are designed to economically and efficiently extract detailed information from large volumes of data. In engineering applications, such as the interaction of shock waves with turbulent flows, this new enhanced data acquisition and management facilitates the data analysis and provides new information about the diversity of dynamic interactions occurring in such flows. These interactions can be two- or threedimensional and can include, for example, separation shocks in front of compression
M.F. Shahab Department of Fluid Flow, Heat Transfer and Combustion, Institute Pprime, Université de Poitiers, ENSMA, CNRS, Futuroscope Chasseneuil Cedex, France Department of Mechanical Engineering and Aeronautics, City University, London EC1V 0HB, UK Department of Mechanical Engineering, DHA Suffa University, Karachi 75500, Pakistan G. Lehnasch () Department of Fluid Flow, Heat Transfer and Combustion, Institute Pprime, Université de Poitiers, ENSMA, CNRS, Futuroscope Chasseneuil Cedex, France e-mail: [email protected] T.B. Gatski Department of Fluid Flow, Heat Transfer and Combustion, Institute Pprime, Université de Poitiers, ENSMA, CNRS, Futuroscope Chasseneuil Cedex, France Center for Coastal Physical Oceanography and Ocean, Earth and Atmospheric Sciences, Old Dominion University, Norfolk, VA 23529, USA © Springer International Publishing Switzerland 2017 A. Pollard et al. (eds.), Whither Turbulence and Big Data in the 21st Century?, DOI 10.1007/978-3-319-41217-7_6
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corners, and impinging-reflecting oblique shocks, or around swept wedges and blunt fins. All of these have characterizing features that distinguish their dynamics. The interest in this study is inherently constrained to impinging-reflecting oblique shocks on a plane boundary layer flow. Nevertheless, even here the literature is vast and numerous experimental and numerical studies have taken place over the last decade [1, 7, 8, 13, 15, 20, among others]. Due to the complex interactions inherent in the phenomenon, a complete understanding of the dynamics remains elusive, however. The interaction between the turbulence and a shock wave results in a modification of both fields. For the turbulence, the characteristic velocity, time and length scales change considerably, and for the shock wave, it can exhibit substantial unsteadiness and deformation. The extent to which each of these modifications occur depends on a wide variety of parameters such as the strength, orientation, location, and shape of the shock wave, as well as the flo
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