Author: Peter John DiamessisPublisher:
ISBN:
Category :
Languages : en
Pages : 370
Book Description
An Investigation of Vortical Structures and Density Overturns in Stably Stratified Homogeneous Turbulence by Means of Direct Numerical Simulation
Author: Peter John DiamessisPublisher:
ISBN:
Category :
Languages : en
Pages : 370
Book Description
Homogeneous Turbulence Dynamics
Author: Pierre SagautPublisher: Springer
ISBN: 3319731629
Category : Science
Languages : en
Pages : 912
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.
Applied Parallel Computing. Advanced Scientific Computing
Author: Juha FagerholmPublisher: Springer Science & Business Media
ISBN: 354043786X
Category : Computers
Languages : en
Pages : 597
Book Description
TheseproceedingscontainthepaperspresentedatPARA2002,theSixth- ternationalConferenceonAppliedParallelComputing. PARA2002washeldin Espoo,Finland,June15–18,2002,andhostedbyCSC,theFinnishinformation technologycenterforscience. Thegeneralthemeoftheconferencewasadvanced scienti?ccomputing. Theconferencedemonstratedtheabilityofadvancedscienti?ccomputingto solvereal-worldproblems,andhighlightedmethods,instruments,andtrendsin futurescienti?ccomputing. Theconferencebeganwithaone-daytutorialsession onGridprogramming. Theconferencefocusedonanapplication-oriented,multi-disciplinary,and multi-scaleapproach. Awidevarietyofscienti?ccomputingapplicationswere introduced,fromsemiconductorprocessingandbehaviorofthehumanbodyto oceanicandatmosphericphenomena. Scienti?ccomputingcoupledwithmulti-disciplinaryandmulti-scaleexp- tisewillplayasigni?cantroleinsolvingchallengingproblemsinscience.
Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer
Author: Cedrick AnsorgePublisher: Springer
ISBN: 9783319450438
Category : Science
Languages : en
Pages : 167
Book Description
This thesis presents a study of strong stratification and turbulence collapse in the planetary boundary layer, opening a new avenue in this field. It is the first work to study all regimes of stratified turbulence in a unified simulation framework without a break in the paradigms for representation of turbulence. To date, advances in our understanding and the parameterization of turbulence in the stable boundary layer have been hampered by difficulties simulating the strongly stratified regime, and the analysis has primarily been based on field measurements. The content presented here changes that paradigm by demonstrating the ability of direct numerical simulation to address this problem, and by doing so to remove the uncertainty of turbulence models from the analysis. Employing a stably stratified Ekman layer as a simplified physical model of the stable boundary layer, the three stratification regimes observed in nature— weakly, intermediately and strongly stratified—are reproduced, and the data is subsequently used to answer key, long-standing questions. The main part of the book is organized in three sections, namely a comprehensive introduction, numerics, and physics. The thesis ends with a clear and concise conclusion that distills specific implications for the study of the stable boundary layer. This structure emphasizes the physical results, but at the same time gives relevance to the technical aspects of numerical schemes and post-processing tools. The selection of the relevant literature during the introduction, and its use along the work appropriately combines literature from two research communities: fluid dynamics, and boundary-layer meteorology.
Scientific and Technical Aerospace Reports
Author: Applied Mechanics Reviews
Author: Applied Parallel Computing
Author: A Study on Homogeneous Sheared Stably Stratified Turbulence
Author: Gavin PortwoodPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Homogeneous sheared and stably stratified turbulence is considered as a fundamental flow relevant to the study of geophysical turbulence and, generally, anisotropic turbulence. Numerical experiments are performed via high resolution direct numerical simulation (DNS) in a geophysically-relevant parameter space previously inaccessible to simulation. Turbulent dynamics relevant to the modeling of geophysical hydrodynamics are investigated as a function of mean flow and fluid parameters. An active tuning scheme is implemented to induce temporally stationary turbulent kinetic energy in order to evaluate turbulence that is statistically independent of initial conditions and spatio-temporally homogeneous. Subject to this constraint, the parametric dependence of the flow reduces to a single Reynolds number, here defined as the shear Reynolds number Res ≡ (LC∕LK)4∕3 (Itweire et al. 1993, Corrsin 1958), where L C is the smallest turbulent anisotropic scale in the flow and LK represents the smallest scales of turbulence associated with viscosity, which parameterizes the range of length scales that are associated with isotropy for stationary flow configurations. By varying Res independently from other parameters, commonly suggested empirical scalings of the rate of mixing are shown to not hold. The turbulence and scalar dynamics approach an asymptotic state for Res ≿ 300, as evidenced by small-scale isotropy, an asymptotic partitioning of available potential energy to kinetic energy and two-point scaling. In light of this asymptotic state, an alternative parameterization is suggested, from robust classical scaling arguments, with dependence only on classical universal constants and mean energetics in the high Res limit. In an effort to simplify the conceptual description of geophysical turbulence, we suggest a unified length-scale framework based on the work of Gargett et al. 1984. Based on this framework, a parameterization for the isotropic length scale regime is suggested for generic (non-stationarity) flow configurations, which is evaluated with a series of decaying simulations.
MOLD
Author: William KerneyDissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 684
Book Description