Studies of Shock Wave Interactions with Homogeneous and Isotropic Turbulence

Studies of Shock Wave Interactions with Homogeneous and Isotropic Turbulence PDF Author: National Aeronautics and Space Adm Nasa
Publisher:
ISBN: 9781730717345
Category :
Languages : en
Pages : 58

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Book Description
A nearly homogeneous nearly isotropic compressible turbulent flow interacting with a normal shock wave has been studied experimentally in a large shock tube facility. Spatial resolution of the order of 8 Kolmogorov viscous length scales was achieved in the measurements of turbulence. A variety of turbulence generating grids provide a wide range of turbulence scales. Integral length scales were found to substantially decrease through the interaction with the shock wave in all investigated cases with flow Mach numbers ranging from 0.3 to 0.7 and shock Mach numbers from 1.2 to 1.6. The outcome of the interaction depends strongly on the state of compressibility of the incoming turbulence. The length scales in the lateral direction are amplified at small Mach numbers and attenuated at large Mach numbers. Even at large Mach numbers amplification of lateral length scales has been observed in the case of fine grids. In addition to the interaction with the shock the present work has documented substantial compressibility effects in the incoming homogeneous and isotropic turbulent flow. The decay of Mach number fluctuations was found to follow a power law similar to that describing the decay of incompressible isotropic turbulence. It was found that the decay coefficient and the decay exponent decrease with increasing Mach number while the virtual origin increases with increasing Mach number. A mechanism possibly responsible for these effects appears to be the inherently low growth rate of compressible shear layers emanating from the cylindrical rods of the grid. Briassulis, G. and Agui, J. and Watkins, C. B. and Andreopoulos, Y. Langley Research Center...

Studies of Shock Wave Interactions with Homogeneous and Isotropic Turbulence

Studies of Shock Wave Interactions with Homogeneous and Isotropic Turbulence PDF Author: National Aeronautics and Space Adm Nasa
Publisher:
ISBN: 9781730717345
Category :
Languages : en
Pages : 58

Get Book Here

Book Description
A nearly homogeneous nearly isotropic compressible turbulent flow interacting with a normal shock wave has been studied experimentally in a large shock tube facility. Spatial resolution of the order of 8 Kolmogorov viscous length scales was achieved in the measurements of turbulence. A variety of turbulence generating grids provide a wide range of turbulence scales. Integral length scales were found to substantially decrease through the interaction with the shock wave in all investigated cases with flow Mach numbers ranging from 0.3 to 0.7 and shock Mach numbers from 1.2 to 1.6. The outcome of the interaction depends strongly on the state of compressibility of the incoming turbulence. The length scales in the lateral direction are amplified at small Mach numbers and attenuated at large Mach numbers. Even at large Mach numbers amplification of lateral length scales has been observed in the case of fine grids. In addition to the interaction with the shock the present work has documented substantial compressibility effects in the incoming homogeneous and isotropic turbulent flow. The decay of Mach number fluctuations was found to follow a power law similar to that describing the decay of incompressible isotropic turbulence. It was found that the decay coefficient and the decay exponent decrease with increasing Mach number while the virtual origin increases with increasing Mach number. A mechanism possibly responsible for these effects appears to be the inherently low growth rate of compressible shear layers emanating from the cylindrical rods of the grid. Briassulis, G. and Agui, J. and Watkins, C. B. and Andreopoulos, Y. Langley Research Center...

Studies of Shock Wave Interactions with Homogeneous and Isotropic Turbulence

Studies of Shock Wave Interactions with Homogeneous and Isotropic Turbulence PDF Author: G. Briassulis
Publisher:
ISBN:
Category : Shock waves
Languages : en
Pages : 60

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Interactions of Isotropic and Homogeneous Turbulence with Shock Waves

Interactions of Isotropic and Homogeneous Turbulence with Shock Waves PDF Author: George K. Briassulis
Publisher:
ISBN:
Category :
Languages : en
Pages : 542

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Shock Wave-Boundary-Layer Interactions

Shock Wave-Boundary-Layer Interactions PDF Author: Holger Babinsky
Publisher: Cambridge University Press
ISBN: 1139498649
Category : Technology & Engineering
Languages : en
Pages : 481

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Book Description
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.

Interaction of Isotropic Turbulence with a Shock Wave

Interaction of Isotropic Turbulence with a Shock Wave PDF Author: Sangsan Lee
Publisher:
ISBN:
Category : Shock waves
Languages : en
Pages : 0

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Book Description
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

Numerical Computations of Turbulence Amplification in Shock Wave Interactions

Numerical Computations of Turbulence Amplification in Shock Wave Interactions PDF Author: Thomas A. Zang
Publisher:
ISBN:
Category : Shock waves
Languages : en
Pages : 40

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Interaction of Isotropic Turbulence with a Shock Wave

Interaction of Isotropic Turbulence with a Shock Wave PDF Author: S. Lee
Publisher:
ISBN:
Category : Compressibility
Languages : en
Pages : 242

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Interaction of Isotropic Turbulence with a Shock Wave

Interaction of Isotropic Turbulence with a Shock Wave PDF Author: Sangsan Lee
Publisher:
ISBN:
Category : Shock waves
Languages : en
Pages : 0

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Homogeneous Turbulence Dynamics

Homogeneous Turbulence Dynamics PDF Author: Pierre Sagaut
Publisher: Springer
ISBN: 3319731629
Category : Science
Languages : en
Pages : 912

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Book Description
This book provides state-of-the-art results and theories in homogeneous turbulence, including anisotropy and compressibility effects with extension to quantum turbulence, magneto-hydodynamic turbulence and turbulence in non-newtonian fluids. Each chapter is devoted to a given type of interaction (strain, rotation, shear, etc.), and presents and compares experimental data, numerical results, analysis of the Reynolds stress budget equations and advanced multipoint spectral theories. The role of both linear and non-linear mechanisms is emphasized. The link between the statistical properties and the dynamics of coherent structures is also addressed. Despite its restriction to homogeneous turbulence, the book is of interest to all people working in turbulence, since the basic physical mechanisms which are present in all turbulent flows are explained. The reader will find a unified presentation of the results and a clear presentation of existing controversies. Special attention is given to bridge the results obtained in different research communities. Mathematical tools and advanced physical models are detailed in dedicated chapters.

Psuedospectral Calculation of Shock Turbulence Interactions

Psuedospectral Calculation of Shock Turbulence Interactions PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 20

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Book Description