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Compressibility, Turbulence and High Speed Flow introduces the reader to the field of compressible turbulence and compressible turbulent flows across a broad speed range, through a unique complimentary treatment of both the theoretical foundations and the measurement and analysis tools currently used. The book provides the reader with the necessary background and current trends in the theoretical and experimental aspects of compressible turbulent flows and compressible turbulence. Detailed derivations of the pertinent equations describing the motion of such turbulent flows is provided and an extensive discussion of the various approaches used in predicting both free shear and wall bounded flows is presented. Experimental measurement techniques common to the compressible flow regime are introduced with particular emphasis on the unique challenges presented by high speed flows. Both experimental and numerical simulation work is supplied throughout to provide the reader with an overall perspective of current trends. An introduction to current techniques in compressible turbulent flow analysis An approach that enables engineers to identify and solve complex compressible flow challenges Prediction methodologies, including the Reynolds-averaged Navier Stokes (RANS) method, scale filtered methods and direct numerical simulation (DNS) Current strategies focusing on compressible flow control
Implicit Large Eddy Simulation (ILES) has rapidly emerged as a powerful techniquewhich is utilised to explore the unsteady compressible turbulent flows. Apart from o ering accuracy in numerical simulations, ILES is also computationallye cient compared to Direct Numerical Simulations or conventional Large Eddy Simulations. This report focuses on the validation of the existing high-resolution methodswithin the framework of ILES and explores its applications to the high-speed compressibleturbulent flows such as a typical flow field inside a scramjet engine. Themethodology applied in the current work employs a fifth-order MUSCL scheme witha modified variable extrapolation and a three-stage second-order Runge-Kutta schemefor temporal advancement. In order to simulate a realistic and accurate supersonic turbulent boundary layer (STBL)a synthetic turbulent inflow data generation method based upon digital filters has beenimplemented. This technique has been validated and compared against various otherturbulent inflow data generation methods in order to find the most accurate, reliableand computationally e cient technique. The high-speed complex multi-species flowof a transverse sonic jet injection into a supersonic crossflow (JISC), which is typicalfuel injection strategy inside a scramjet engine, has been investigated for time-averagedand instantaneous flow. It has been demonstrated that the incoming STBL plays a vitalrole in establishing the correct flow dynamics in JISC study as it enhances the KHinstabilities in the flow field. Thermally perfect gas formulation has been implemented according to the NACA-1135 report to study the e ects of high temperatures on the ratio of specific heats (). Using this, the full geometry of the HyShot-II scramjet engine is investigated to obtainthe inflow conditions for the HyShot-II combustion chamber. Although the design ofHyShot-II allowed to disgorge the shock and boundary layer which could otherwiseenter the combustion chamber, but, it has been demonstrated that the flow field insidethe combustion chamber still consists of a weak shock-train. Finally, the hydrogeninjection is analysed inside the HyShot-II combustion chamber, with the shock-traintravelling inside and the incoming STBL using digital filters based technique, to explorevarious time-averaged and instantaneous flow structures and parameters with aview to enhance the understanding of the complex flow field inside the combustionchamber. It is demonstrated from the detailed investigations of a complex high-speedflow that ILES methodology has the potential to develop the understandings of thehigh-speed compressible turbulent flows using comparatively less computational resources.
A good understanding of turbulent compressible flows is essential to the design and operation of high-speed vehicles. Such flows occur, for example, in the external flow over the surfaces of supersonic aircraft, and in the internal flow through the engines. Our ability to predict the aerodynamic lift, drag, propulsion and maneuverability of high-speed vehicles is crucially dependent on our knowledge of turbulent shear layers, and our understanding of their behavior in the presence of shock waves and regions of changing pressure. Turbulent Shear Layers in Supersonic Flow provides a comprehensive introduction to the field, and helps provide a basis for future work in this area. Wherever possible we use the available experimental work, and the results from numerical simulations to illustrate and develop a physical understanding of turbulent compressible flows.
This volume comprises the communications presented at the ETC 11, the EUROMECH European Turbulence conference held in 2007 in Porto. The scientific committee has chosen the contributions out of the following topics: Acoustics of turbulent flows; Atmospheric turbulence; Control of turbulent flows; Geophysical and astrophysical turbulence; Instability and transition; Intermittency and scaling; Large eddy simulation and related techniques; MHD turbulence; Reacting and compressible turbulence; Transport and mixing; Turbulence in multiphase and non-Newtonian flows; Vortex dynamics and structure formation; Wall bounded flows.

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