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An Investigation Into The Spectral Evolution Of Turbulent Mixing By Rayleigh Taylor Instability
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Book Synopsis An Investigation Into the Spectral Evolution of Turbulent Mixing by Rayleigh-Taylor Instability by : Peter Nixon Wilson
Download or read book An Investigation Into the Spectral Evolution of Turbulent Mixing by Rayleigh-Taylor Instability written by Peter Nixon Wilson and published by . This book was released on 1998 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Turbulent Mixing by Rayleigh-Taylor Instability by : K. I. Read
Download or read book Experimental Investigation of Turbulent Mixing by Rayleigh-Taylor Instability written by K. I. Read and published by . This book was released on 1983 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spectral Analysis of the Turbulent Mixing of Two Fluids by :
Download or read book Spectral Analysis of the Turbulent Mixing of Two Fluids written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We describe a spectral approach to the investigation of fluid instability, generalized turbulence, and the interpenetration of fluids across an interface. The Technique also applies to a single fluid with large variations in density. Departures of fluctuating velocity components from the local mean are far subsonic, but the mean Mach number can be large. Validity of the description is demonstrated by comparisons with experiments on turbulent mixing due to the late stages of Rayleigh-Taylor instability, when the dynamics become approximately self-similar in response to a constant body force. Generic forms for anisotropic spectral structure are described and used as a basis for deriving spectrally integrated moment equations that can be incorporated into computer codes for scientific and engineering analyses.
Book Synopsis Compressible Turbulent Mixing - Proceedings Of Fifth International Workshop by : R Young
Download or read book Compressible Turbulent Mixing - Proceedings Of Fifth International Workshop written by R Young and published by World Scientific. This book was released on 1996-11-22 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this volume, compressible turbulent mixing is discussed from the viewpoints of experiment, numerical simulation and theoretical models. The major problem areas include Rayleigh-Taylor and Richtmyer-Meshkov instabilities, and multiphase mixing problems. A variety of initial configurations are discussed, including single and multiple mode perturbations and nonlinear geometries in both two and three dimensions. The effects of experimental and numerical artifacts are also considered.
Book Synopsis Hydrodynamic Instabilities and Turbulence by : Ye Zhou
Download or read book Hydrodynamic Instabilities and Turbulence written by Ye Zhou and published by Cambridge University Press. This book was released on 2024-05-31 with total page 611 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive reference guide to turbulent mixing driven by Rayleigh-Taylor, Richtmyer-Meshkov and Kelvin-Helmholtz instabilities.
Book Synopsis Advances in Compressible Turbulent Mixing by :
Download or read book Advances in Compressible Turbulent Mixing written by and published by . This book was released on 1992 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Investigation of the Influence of Initial Conditions on Rayleigh-Taylor Mixing by : Nicholas J. Mueschke
Download or read book An Investigation of the Influence of Initial Conditions on Rayleigh-Taylor Mixing written by Nicholas J. Mueschke and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments and direct numerical simulations (DNS) have been performed to examine the effects of initial conditions on the dynamics of a Rayleigh-Taylor unstable mixing layer. Experiments were performed on a water channel facility to measure the interfacial and velocity perturbations initially present at the two-fluid interface in a small Atwood number mixing layer. The experimental measurements have been parameterized for use in numerical simulations of the experiment. Two- and three-dimensional DNS of the experiment have been performed using the parameterized initial conditions. It is shown that simulations implemented with initial velocity and density perturbations, rather than density perturbations alone, are required to match experimentally-measured statistics and spectra. Data acquired from both the experiment and numerical simulations are used to examine the role of initial conditions on the evolution of integral-scale, turbulence, and mixing statistics. Early-time turbulence and mixing statistics are shown to be strongly-dependent upon the early-time transition of the initial perturbation from a weakly-nonlinear to a strongly-nonlinear flow.
Book Synopsis An Investigation of the Influence of Initial Conditions on Rayleigh-Taylor Mixing by : O. Schilling
Download or read book An Investigation of the Influence of Initial Conditions on Rayleigh-Taylor Mixing written by O. Schilling and published by . This book was released on 2004 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments and direct numerical simulations (DNS) have been performed to examine the effects of initial conditions on the dynamics of a Rayleigh-Taylor unstable mixing layer. Experiments were performed on a water channel facility to measure the interfacial and velocity perturbations initially present at the two-fluid interface in a small Atwood number mixing layer. The experimental measurements have been parameterized for use in numerical simulations of the experiment. Two- and three-dimensional DNS of the experiment have been performed using the parameterized initial conditions. It is shown that simulations implemented with initial velocity and density perturbations, rather than density perturbations alone, are required to match experimentally-measured statistics and spectra. Data acquired from both the experiment and numerical simulations are used to examine the role of initial conditions on the evolution of integral-scale, turbulence, and mixing statistics. Early-time turbulence and mixing statistics are shown to be strongly-dependent upon the early-time transition of the initial perturbation from a weakly-nonlinear to a strongly-nonlinear flow.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Progress in Turbulence VIII by : Ramis Örlü
Download or read book Progress in Turbulence VIII written by Ramis Örlü and published by Springer Nature. This book was released on 2019-08-27 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume collects the edited and reviewed contributions presented in the 8th iTi Conference on Turbulence, held in Bertinoro, Italy, in September 2018. In keeping with the spirit of the conference, the book was produced afterwards, so that the authors had the opportunity to incorporate comments and discussions raised during the event. The respective contributions, which address both fundamental and applied aspects of turbulence, have been structured according to the following main topics: I TheoryII Wall-bounded flowsIII Simulations and modellingIV ExperimentsV Miscellaneous topicsVI Wind energy/div
Book Synopsis Three-dimensional High-resolution Simulations of Rayleigh-Taylor Instability and Turbulent Mixing by :
Download or read book Three-dimensional High-resolution Simulations of Rayleigh-Taylor Instability and Turbulent Mixing written by and published by . This book was released on 1997 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary results of three-dimensional simulations of compressible Rayleigh-Taylor instability and turbulent mixing in an ideal gas using the piecewise-parabolic method (PPM) (with and without molecular dissipation terms) are presented. Simulations with spatial resolutions up to 5123 were performed. Two types of convergence studies are presented. Statistical analyses of the data are discussed, include: 1: spectra, and; 2) horizontally-averaged terms in the kinetic energy and onstrophy density evolution equations. The application of this statistical data to the development and testing of subgrid-scale models appropriate for compressible Rayleigh-Taylor instability-induced turbulent mixing is discussed.
Book Synopsis Turbulent mixing by Rayleigh-Taylor instability by : M. J. Andrews
Download or read book Turbulent mixing by Rayleigh-Taylor instability written by M. J. Andrews and published by . This book was released on 1986 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Perspectives on Turbulent Mixing Induced by Rayleigh-Taylor and Richtmyer-Meshkov Instabilities by :
Download or read book New Perspectives on Turbulent Mixing Induced by Rayleigh-Taylor and Richtmyer-Meshkov Instabilities written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent hydrodynamic mixing induced by the Rayleigh-Taylor (RT) and Richtmyer-Meshkov (RM) instabilities occurs in settings as varied as exploding stars (supernovae), inertial confinement fusion (ICF) capsule implosions, and macroscopic flows on fluid dynamics facilities such as shock tubes. We have developed a quantitative description of turbulence from the onset to the asymptotic end-state. Our treatment, based on a combined approach of theory, direct numerical simulation (DNS), and experimental data analysis, has broad generality. We will report two key areas in our progress. First, we have developed a robust, easy to apply criteria for the mixing transition in a time-dependent flow. This allows an assessment of whether flows, be they from supernova explosions or ICF experiments, should be turbulent or not. Second, we inspect the structure, scaling and spectra of the Rayleigh-Taylor (RT) and Richtmyer-Meshkov (RM) instabilities induced flows.
Book Synopsis Constructive Modeling of Structural Turbulence and Hydrodynamic Instabilities by : Oleg Mikha?lovich Belot?serkovski?
Download or read book Constructive Modeling of Structural Turbulence and Hydrodynamic Instabilities written by Oleg Mikha?lovich Belot?serkovski? and published by World Scientific. This book was released on 2009 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides an original approach in the research of structural analysis of free developed shear compressible turbulence at high Reynolds number on the base of direct numerical simulation (DNS) and instability evolution for ideal medium (integral conservation laws) with approximate mechanism of dissipation (FLUX dissipative monotone ?upwind? difference schemes) and does not use any explicit sub-grid approximation and semi-empirical models of turbulence. Convective mixing is considered as a principal part of conservation law.Appropriate hydrodynamic instabilities (free developed shear turbulence) are investigated from unique point of view. It is based on the concept of large ordered structures with stochastic core of small scale developed turbulence (?turbulent spot?). Decay of ?turbulent spot? are simulated by Monte Carlo method. Proposed approach is based on two hypotheses: statistical independence of the characteristic of large ordered structures (LOS) and small-scale turbulence (ST) ?and? weak influence of molecular viscosity (or more generally, dissipative mechanism) on properties of large ordered structures.Two versions of instabilities, due to Rayleigh-Taylor and Richtmyer-Meshkov are studied detail by the three-dimensional calculations, extended to the large temporal intervals, up to turbulent stage and investigation turbulent mixing zone (TMZ).The book covers both the fundamental and practical aspects of turbulence and instability and summarizes the result of numerical experiments conducted over 30 years period with direct participation of the author.In the book are cited the opinions of the leading scientists in this area of research: Acad. A S Monin (Russia), Prof. Y Nakamura (Japan, Nagoya University) and Prof. F Harlow (USA, Los-Alamos).
Book Synopsis Rayleigh-Taylor Instability-induced Mixing by :
Download or read book Rayleigh-Taylor Instability-induced Mixing written by and published by . This book was released on 2007 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A spectral/compact finite-difference method with a third-order Adams-Bashforth-Moulton time-evolution scheme is used to perform a direct numerical simulation (DNS) of Rayleigh-Taylor flow. The initial conditions are modeled by parameterizing the multi-mode velocity and density perturbations measured just off of the splitter plate in water channel experiments. Parameters in the DNS are chosen to match the experiment as closely as possible. The early-time transition from a weakly-nonlinear to a strongly-nonlinear state, as well as the onset of turbulence, is examined by comparing the DNS and experimental results. The mixing layer width, molecular mixing parameter, vertical velocity variance, and density variance spectrum obtained from the DNS are shown to be in good agreement with the corresponding experimental values.
Book Synopsis Effect of Initial Conditions on Molecular Mixing in a High Schmidt-number Rayleigh-Taylor Mixing Layer by : Lakshmi Ayyappa Raghu Mutnuri
Download or read book Effect of Initial Conditions on Molecular Mixing in a High Schmidt-number Rayleigh-Taylor Mixing Layer written by Lakshmi Ayyappa Raghu Mutnuri and published by . This book was released on 2011 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Characterizing molecular mixing in Rayleigh-Taylor instability (RTI) driven flows where the density and velocity fields are coupled is essential for developing exacting predictive models. Sensitivity of the Rayleigh Taylor mixing layer to initial conditions is a topic that is being explored extensively in interests of accurate turbulent mix model development and its direct consequence in various applications like design of inertial confinement fuel capsule and atmospheric modeling. As part of the current work, an experimental investigation of the effect of initial conditions on molecular mixing in a low Atwood number(~7.5 x 10−4), high Schmidt number(~1000), RTI driven mixing layer is undertaken. An experimental facility for observing the evolution of an RTI driven mixing layer to a buoyancy Reynolds number of ~10000 was developed. Diagnostics for measuring volume fraction evolution through passive scalar (Nigrosine) estimates and mixture fraction evolution through reactive scalar (Phenolphthalein) measurements were calibrated and established. The initial perturbations at the interface were modeled from the passive scalar runs and validated using an Implicit Large Eddy simulation (ILES). Molecular mixing parameter estimates were calculated by combining the results from the passive scalar and reactive scalar runs. An examination of molecular mixing measurements vis-a-vis variations in initial conditions has revealed that the low wave number loading of the initial density perturbation spectrum has a profound effect on molecular mixing in the mixing layer. The variation was observed in both local and global mixing with possible implications pointing to the delay in mixing transition"--Abstract, leaf iii.
Book Synopsis Turbulence and Instabilities by : O.M. Belotserkovskii
Download or read book Turbulence and Instabilities written by O.M. Belotserkovskii and published by . This book was released on 2000 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monograph presents the newest results in the numerical modeling and computer simulation of turbulence.
