Numerical Computations Of Turbulence Amplification In Shock Wave Interactions
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Numerical Computations Of Turbulence Amplification In Shock Wave Interactions
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Author : Thomas A. Zang
language : en
Publisher:
Release Date : 1983
Numerical Computations Of Turbulence Amplification In Shock Wave Interactions written by Thomas A. Zang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Shock waves categories.
Studies Of Shock Wave Interactions With Homogeneous And Isotropic Turbulence
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Author : G. Briassulis
language : en
Publisher:
Release Date : 1998
Studies Of Shock Wave Interactions With Homogeneous And Isotropic Turbulence written by G. Briassulis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Shock waves categories.
Interaction Of Turbulence With Complex Shock Waves
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Author :
language : en
Publisher:
Release Date : 1994
Interaction Of Turbulence With Complex Shock Waves written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Linear analysis and direct numerical simulation (DNS) are used to study the interaction of a shock wave with a turbulent flow. Effects central to shock wave/boundary layer interaction are identified and explained. The quantitative importance of the turbulence anisotropy and the shock oblique angle is demonstrated. Drop in Reynolds shear stress across a normal shock is shown. The implication for Reynolds stress models is discussed. The role of dilatational turbulent fluctuations on turbulence amplification is studied in detail. An explanation is suggested for lower amplification reported in wind-tunnel studies. Linear analysis & DNS are used to demonstrate the considerable influence of entropic fluctuations on turbulence evolution across a shock. Positive correlation between u' and T ' suppress amplification while negative correlation enhances it. Invalidity of Morkovin's hypothesis is demonstrated. A high order scheme is developed to allow strong shock/turbulence interaction. Results are presented for isotropic turbulence/normal shock interaction. (AN).
Shock Wave Boundary Layer Interactions
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Author : Holger Babinsky
language : en
Publisher: Cambridge University Press
Release Date : 2011-09-12
Shock Wave Boundary Layer Interactions written by Holger Babinsky and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-09-12 with Technology & Engineering categories.
Shock wave-boundary-layer interaction (SBLI) is a fundamental phenomenon in gas dynamics that is observed in many practical situations, ranging from transonic aircraft wings to hypersonic vehicles and engines. SBLIs have the potential to pose serious problems in a flowfield; hence they often prove to be a critical - or even design limiting - issue for many aerospace applications. This is the first book devoted solely to a comprehensive, state-of-the-art explanation of this phenomenon. It includes a description of the basic fluid mechanics of SBLIs plus contributions from leading international experts who share their insight into their physics and the impact they have in practical flow situations. This book is for practitioners and graduate students in aerodynamics who wish to familiarize themselves with all aspects of SBLI flows. It is a valuable resource for specialists because it compiles experimental, computational and theoretical knowledge in one place.
Numerical Computation Of Shock Wave
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Author : S.-W. Kim
language : en
Publisher:
Release Date : 1989
Numerical Computation Of Shock Wave written by S.-W. Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Aerodynamics, Transonic categories.
Numerical Study Of Variable Density Flow Interaction With A Shock Wave
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Author : Yifeng Tian
language : en
Publisher:
Release Date : 2019
Numerical Study Of Variable Density Flow Interaction With A Shock Wave written by Yifeng Tian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Electronic dissertations categories.
Fundamental understanding and modeling of multi-fluid miscible Shock-Turbulence Interaction (STI) and the corresponding post-shock turbulence are critically important to many different applications, such as supersonic combustion, nuclear fusion, and astrophysics. This thesis presents a comprehensive study of the multi-fluid Shock-Turbulence flow using accurate flow-resolving, shock-capturing, and shock-resolving simulations. The objective is to develop a better understanding of underlying mechanisms of the variable density fluid effects on shock-turbulence interactions, post-shock turbulence evolution and mixing in high speed flows. Theoretical and numerical analyses of data confirm that all turbulence scales as well as the STI are well captured by the computational method, which is based on a high order hybrid monotonicity preserving-compact finite difference scheme. Linear Interaction Approximation (LIA) convergence tests are conducted to show that shock-capturing numerical simulations exhibit similar converging trend to LIA predictions as more demanding shock-resolving Direct Numerical Simulations (DNS) method. The effects of density variations on STI are studied first by comparing the "Eulerian" results obtained from both Eulerian (grid) and Lagrangian (particle) data for a multi-fluid mixture with the corresponding single-fluid results. The comparison shows that the turbulence amplification by the normal shock wave is much higher and the reduction in turbulence length scales is more significant when strong density variations are present. Turbulent mixing enhancement by the shock is also increased and stronger mixing asymmetry in the post-shock region is observed when there are significant density variations. The dominating mechanisms behind STI influence on post-shock turbulence and mixing are identified by analyzing the transport equations for the Reynolds stresses, vorticity, normalized mass flux, and density specific volume covariance. Statistical analyses of the velocity gradient tensor (VGT) show that the density variations also significantly change the turbulence structure and flow topology. Compared to the single-fluid case, the correlation between rotation and strain is found to be weaker in the multi-fluid case, which is shown to be the result of complex role density plays when the flow passes through the shock. Furthermore, a stronger symmetrization of the joint PDF of second and third invariants of the anisotropic velocity gradient tensor, as well as the PDF of the vortex stretching contribution to the enstrophy equation, are observed in the multi-fluid case. Lagrangian dynamics of the VGT and its invariants are studied by considering particle residence times in different flow regions and the conditional mean rate of change vectors. The pressure Hessian contributions to the VGT invariants transport equations are shown to be strongly affected by the shock wave and local density, making them critically important to the flow dynamics and turbulence structure. Lagrangian statistics of non-inertial particles in post-shock turbulence show that the single-particle dispersion rate and anisotropy can be correlated to the development of post-shock Reynolds stress. The particle dispersion in the streamwise direction is found to be non-Gaussian, with the skewness of the dispersion PDF dependent on the density variations. Lagrangian integral time scales of fluid particles with different densities are obtained from velocity autocorrelation functions. Particle pair dispersion generally follows the temporal scaling for isotropic turbulence. In this thesis, the propagation of shock waves in non-uniform density media is also studied. Theoretical analyses show that in both linear and nonlinear regime, there are similarities in shock propagation in non-uniform density fields generated by fluctuations in entropy and compositional fields. The 1D numerical results are shown to agree well with theoretical solutions obtained from classical Chisnell-Whitham theory for weak shocks and linearly varying density fields. For more significantly varying density profiles, the numerical results deviate from the theoretical solutions and exhibit additional long-wavelength oscillations, which are shown to be related to the re-reflected waves. A simplified model (named CWRW) that includes the effects of re-reflected waves is proposed to compensate for the CW model definitions. The results obtained by the proposed CWRW model show significant improvement over the classical CW model. The three-dimensional (3D) effects concerning the shock propagation in 3D non-uniform density media are studied by considering the wavenumber ratio of the streamwise and spanwise length scales in the density field. The asymptotic limits for wavelength ratio approaching zero and infinity are investigated and used to provide a bound for shock propagation in 3D non-uniform media.
A Numerical Solution For The Interaction Of A Moving Shock Wave With A Turbulent Mixing Region
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Author : William Fred Walker
language : en
Publisher:
Release Date : 1966
A Numerical Solution For The Interaction Of A Moving Shock Wave With A Turbulent Mixing Region written by William Fred Walker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Shock waves categories.
Numerical Simulation Of 3 D Shock Wave Turbulent Boundary Layer Interaction Using A Two Equation Model Of Turbulence
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Author : Marianna Gnedin
language : en
Publisher:
Release Date : 1996
Numerical Simulation Of 3 D Shock Wave Turbulent Boundary Layer Interaction Using A Two Equation Model Of Turbulence written by Marianna Gnedin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Understanding And Predicting Shockwave And Turbulent Boundary Layer Interactions
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Author : M. Pino Martin
language : en
Publisher:
Release Date : 2009
Understanding And Predicting Shockwave And Turbulent Boundary Layer Interactions written by M. Pino Martin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Laminar boundary layer categories.
Shockwave and turbulent boundary layer interactions produce intense localized pressure loads and heating rates that can have a dramatic influence on the drag and heating experienced by a high-speed vehicle, and can significantly impact fuel mixing and combustion in propulsion systems. The lack of standardized and traceable databases prevents the calibration of computational fluid dynamic models to accurately represent these critical flow phenomena. In this work we accomplished the development and validation against experiments at the same flow and boundary conditions of direct numerical simulations of shock and turbulent boundary layer interactions. We pioneered the development of a unique numerical capability that allows the accurate and detailed three-dimensional turbulence data at a reasonable turn-around time. In turn, parametric studies of fundamental flow physics are feasible, for the first time. By accurate, it is meant that the numerical uncertainty is within the experimental error.
Interaction Of Isotropic Turbulence With A Shock Wave
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Author : Sangsan Lee
language : en
Publisher:
Release Date : 1992
Interaction Of Isotropic Turbulence With A Shock Wave written by Sangsan Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Shock waves categories.
As a first step to understand the compressibility effects, interaction of isotropic quasi-incompressible turbulence with a weak shock wave was studied by three-dimensional time-dependent direct numerical simulations. In addition, linear analysis was used to study interaction of isotropic turbulence with shock waves of a wide range of strengths. The effects of the fluctuation Mach number M sub t and the average Mach number M sub 1 superscript u of the upstream turbulence on turbulence statistics were investigated. Both numerical simulations and linear analyses of the interaction show that turbulence is enhanced during the interaction with a shock wave. Turbulent kinetic energy (TKE) and transverse vorticity components are amplified, and turbulent length scales are decreased. The predictions of the linear analyses compare favorably with simulation results for flows with M sub t