Experimental And Numerical Investigation Of Developing Turbulent Flow Over A Wavy Wall
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Experimental And Numerical Investigation Of Developing Turbulent Flow Over A Wavy Wall
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Author : Vinicius Martins Segunda
language : en
Publisher:
Release Date : 2017
Experimental And Numerical Investigation Of Developing Turbulent Flow Over A Wavy Wall written by Vinicius Martins Segunda and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Turbulent flow over a wavy wall in a horizontal channel is investigated by experimental and numerical methods. The thorough problem understanding can advance turbulent flow physics knowledge for separating and reattaching flows. Another important consideration is the performance evaluation of mathematical models used in computational fluid dynamics (CFD) codes to predict the flow characteristics. This study explores numerical models because they are critically important to the design and performance evaluation of engineering systems. The experimental data are obtained to provide repository data and more insights into the flow physics considering both the flow development and fully periodic regions. A channel with a wavy bottom wall is considered for this study, and its main characteristic is a value of 10 for the ratio between the wave length and wave amplitude. A high-resolution particle image velocimetry (PIV) system is used to obtain detailed measurements of velocity at Reynolds number of 5040, 8400, 10700 and 13040 in both the developing and fully periodic regions. The numerical simulations are performed with a commercial CFD code using four eddy viscosity turbulence models and three Second-Moment Closure (SMC) turbulence models. This work assessed the predictive accuracy of a total of seven turbulence models. The experimental study covered a lack of data for the flow development within the waves, prior the periodic condition region, and it supported the turbulence models evaluation. The experiments provided features of the flow such as the recirculation regions, Reynolds stresses, and turbulent kinetic energy production at different channel locations. A comprehensive comparison between models and experimental data revealed a significant dependency on the turbulence model formulation and on the wall treatment selection for the flow development and fully periodic regions predictions.
Experimental And Numerical Investigation Of Non Isothermal Turbulent Flow Over Wavy Wall
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Author : Liel Barel
language : en
Publisher:
Release Date : 2017
Experimental And Numerical Investigation Of Non Isothermal Turbulent Flow Over Wavy Wall written by Liel Barel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
The Origin Of Turbulence In Near Wall Flows
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Author : A.V. Boiko
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-09
The Origin Of Turbulence In Near Wall Flows written by A.V. Boiko and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-09 with Technology & Engineering categories.
The Origin of Species Charles Darwin The origin of turbulence in fluids is a long-standing problem and has been the focus of research for decades due to its great importance in a variety of engineering applications. Furthermore, the study of the origin of turbulence is part of the fundamental physical problem of turbulence description and the philosophical problem of determinism and chaos. At the end of the nineteenth century, Reynolds and Rayleigh conjectured that the reason of the transition of laminar flow to the 'sinuous' state is in stability which results in amplification of wavy disturbances and breakdown of the laminar regime. Heisenberg (1924) was the founder of linear hydrody namic stability theory. The first calculations of boundary layer stability were fulfilled in pioneer works of Tollmien (1929) and Schlichting (1932, 1933). Later Taylor (1936) hypothesized that the transition to turbulence is initi ated by free-stream oscillations inducing local separations near wall. Up to the 1940s, skepticism of the stability theory predominated, in particular due to the experimental results of Dryden (1934, 1936). Only the experiments of Schubauer and Skramstad (1948) revealed the determining role of insta bility waves in the transition. Now it is well established that the transition to turbulence in shear flows at small and moderate levels of environmental disturbances occurs through development of instability waves in the initial laminar flow. In Chapter 1 we start with the fundamentals of stability theory, employing results of the early studies and recent advances.
An Experimental And Numerical Investigation Of Three Dimensional Turbulent Flow With Decaying Swirl
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Author : M. R. Casey
language : en
Publisher:
Release Date : 1988
An Experimental And Numerical Investigation Of Three Dimensional Turbulent Flow With Decaying Swirl written by M. R. Casey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Finite element method categories.
Experimental And Numerical Studies Of Open Channel Turbulent Flow Over Rough Bed
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Author : 王宪業
language : en
Publisher:
Release Date : 2010
Experimental And Numerical Studies Of Open Channel Turbulent Flow Over Rough Bed written by 王宪業 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Channels (Hydraulic engineering) categories.
Numerical Investigation Of Turbulent Flow Bounded By A Wall And A Free Slip Surface
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Author : Kin Leung Lam
language : en
Publisher:
Release Date : 1989
Numerical Investigation Of Turbulent Flow Bounded By A Wall And A Free Slip Surface written by Kin Leung Lam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1990
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Aeronautics categories.
Star
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Author :
language : en
Publisher:
Release Date : 1973
Star written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Aeronautics categories.
Near Wall Turbulent Flows
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Author : Ronald M. C. So
language : en
Publisher: Elsevier Publishing Company
Release Date : 1993
Near Wall Turbulent Flows written by Ronald M. C. So and has been published by Elsevier Publishing Company this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Mathematics categories.
Knowledge of near-wall turbulence from experimental, theoretical and numerical sources is accumulating at an ever increasing rate. An overview of the latest important developments is reported and discussed in depth in this volume with the goal of stimulating closer dialogue between researchers in all areas of near-wall turbulence. The full text of 95 contributed papers cover a broad range of topics in near-wall turbulent flows that includes boundary layers, coherent structures, drag reduction, experimental methods, high speed flows, numerical simulations, transition and turbulent modeling. The innovativeness of the contributions demonstrates that near-wall turbulence remains a vital and dynamically evolving field with important technological consequences for the future.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1972
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Mechanics, Applied categories.
