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Direct Numerical Simulation Of Boundary Layer Transition With Free Stream Turbulence
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Book Synopsis Direct Numerical Simulation of Boundary-layer Transition with Free-stream Turbulence by : Kristina Durovic
Download or read book Direct Numerical Simulation of Boundary-layer Transition with Free-stream Turbulence written by Kristina Durovic and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct Numerical Simulation of Boundary Layer Transition on a Heated Flat Plate with Elevated Freestream Turbulence by : N. K. Madavan
Download or read book Direct Numerical Simulation of Boundary Layer Transition on a Heated Flat Plate with Elevated Freestream Turbulence written by N. K. Madavan and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Origin of Turbulence in Near-Wall Flows by : A.V. Boiko
Download or read book The Origin of Turbulence in Near-Wall Flows written by A.V. Boiko and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Laminar-Turbulent Transition by : H.F. Fasel
Download or read book Laminar-Turbulent Transition written by H.F. Fasel and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 703 pages. Available in PDF, EPUB and Kindle. Book excerpt: The origins of turbulent flow and the transition from laminar to turbulent flow are among the most important unsolved problems of fluid mechanics and aerodynamics. Besides being a fundamental question of fluid mechanics, there are any number of applications for information regarding transition location and the details of the subsequent turbulent flow. The JUT AM Symposium on Laminar-Turbulent Transition, co-hosted by Arizona State University and the University of Arizona, was held in Sedona, Arizona. Although four previous JUT AM Symposia bear the same appellation (Stuttgart 1979, Novosibirsk 1984, Toulouse 1989, and Sendai 1994) the topics that were emphasized at each were different and reflect the evolving nature of our understanding of the transition process. The major contributions of Stuttgart 1979 centered on nonlinear behavior and later stages of transition in two-dimensional boundary layers. Stability of closed systems was also included with Taylor vortices in different geometries. The topics of Novosibirsk 1984 shifted to resonant wave interactions and secondary instabilities in boundary layers. Pipe- and channel-flow transition were discussed as model problems for the boundary layer. Investigations of free shear layers were presented and a heavy dose of supersonic papers appeared for the first time. The character of Toulouse 1989 was also different in that 3-D boundary layers, numerical simulations, streamwise vortices, and foundation papers on receptivity were presented. Sendai 1994 saw a number of papers on swept wings and 3-D boundary layers. Numerical simulations attacked a broader range of problems.
Book Synopsis Turbulent Shear Flows 5 by : Franz Durst
Download or read book Turbulent Shear Flows 5 written by Franz Durst and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first four symposia in the series on turbulent shear flows have been held alternately in the United States and Europe with the first and third being held at universities in eastern and western States, respectively. Continuing this pattern, the Fifth Symposium on Turbulent Shear Flows was held at Cornell University, Ithaca, New York, in August 1985. The meeting brought together more than 250 participants from around the world to present the results of new research on turbulent shear flows. It also provided a forum for lively discussions on the implications (practical or academic) of some of the papers. Nearly 100 formal papers and about 20 shorter communications in open forums were presented. In all the areas covered, the meeting helped to underline the vitality of current research into turbulent shear flows whether in experimental, theoretical or numerical studies. The present volume contains 25 of the original symposium presentations. All have been further reviewed and edited and several have been considerably extended since their first presentation. The editors believe that the selection provides papers of archival value that, at the same time, give a representative statement of current research in the four areas covered by this book: - Homogeneous and Simple Flows - Free Flows - Wall Flows - Reacting Flows Each of these sections begins with an introductory article by a distinguished worker in the field.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722173401 Total Pages :30 pages Book Rating :4.1/5 (734 download)
Book Synopsis Direct Numerical Simulation of Transitional and Turbulent Flow Over a Heated Flat Plate Using Finite-Difference Schemes by : National Aeronautics and Space Administration (NASA)
Download or read book Direct Numerical Simulation of Transitional and Turbulent Flow Over a Heated Flat Plate Using Finite-Difference Schemes written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work in this report was conducted at NASA Ames Research Center during the period from August 1993 to January 1995 deals with the direct numerical simulation of transitional and turbulent flow at low Mach numbers using high-order-accurate finite-difference techniques. A computation of transition to turbulence of the spatially-evolving boundary layer on a heated flat plate in the presence of relatively high freestream turbulence was performed. The geometry and flow conditions were chosen to match earlier experiments. The development of the momentum and thermal boundary layers was documented. Velocity and temperature profiles, as well as distributions of skin friction, surface heat transfer rate, Reynolds shear stress, and turbulent heat flux were shown to compare well with experiment. The numerical method used here can be applied to complex geometries in a straightforward manner. Madavan, Nateri K. Ames Research Center NCC2-755...
Book Synopsis Physics of Transitional Shear Flows by : Andrey V. Boiko
Download or read book Physics of Transitional Shear Flows written by Andrey V. Boiko and published by Springer Science & Business Media. This book was released on 2011-09-15 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Starting from fundamentals of classical stability theory, an overview is given of the transition phenomena in subsonic, wall-bounded shear flows. At first, the consideration focuses on elementary small-amplitude velocity perturbations of laminar shear layers, i.e. instability waves, in the simplest canonical configurations of a plane channel flow and a flat-plate boundary layer. Then the linear stability problem is expanded to include the effects of pressure gradients, flow curvature, boundary-layer separation, wall compliance, etc. related to applications. Beyond the amplification of instability waves is the non-modal growth of local stationary and non-stationary shear flow perturbations which are discussed as well. The volume continues with the key aspect of the transition process, that is, receptivity of convectively unstable shear layers to external perturbations, summarizing main paths of the excitation of laminar flow disturbances. The remainder of the book addresses the instability phenomena found at late stages of transition. These include secondary instabilities and nonlinear features of boundary-layer perturbations that lead to the final breakdown to turbulence. Thus, the reader is provided with a step-by-step approach that covers the milestones and recent advances in the laminar-turbulent transition. Special aspects of instability and transition are discussed through the book and are intended for research scientists, while the main target of the book is the student in the fundamentals of fluid mechanics. Computational guides, recommended exercises, and PowerPoint multimedia notes based on results of real scientific experiments supplement the monograph. These are especially helpful for the neophyte to obtain a solid foundation in hydrodynamic stability. To access the supplementary material go to extras.springer.com and type in the ISBN for this volume.
Book Synopsis Measurements in Transitional Boundary Layers Under High Free-stream Turbulence and Strong Acceleration Conditions by : Ralph John Volino
Download or read book Measurements in Transitional Boundary Layers Under High Free-stream Turbulence and Strong Acceleration Conditions written by Ralph John Volino and published by . This book was released on 1995 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis IUTAM Laminar-Turbulent Transition by : Spencer Sherwin
Download or read book IUTAM Laminar-Turbulent Transition written by Spencer Sherwin and published by Springer Nature. This book was released on 2021-07-30 with total page 809 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume comprises the carefully revised papers of the 9th IUTAM Symposium on Laminar-Turbulent Transition, held at the Imperial College, London, UK, in September 2019. The papers focus on the leading research in understanding transition to turbulence, which is a challenging topic of fluid mechanics and arises in many modern technologies as well as in nature. The proceedings are of interest for researchers in fluid mechanics and industry who have to handle these types of problems, such as in the aeronautical sector.
Book Synopsis Direct Numerical Simulation of Turbulent Flow Over a Dimpled Flat Plate Using an Immersed Boundary Technique by : Jeremiah J. Gutierrez-Jensen
Download or read book Direct Numerical Simulation of Turbulent Flow Over a Dimpled Flat Plate Using an Immersed Boundary Technique written by Jeremiah J. Gutierrez-Jensen and published by . This book was released on 2011 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many methods of passive flow control rely on changes to surface morphology. Roughening surfaces to induce boundary layer transition to turbulence and in turn delay separation is a powerful approach to lowering drag on bluff bodies. While the influence in broad terms of how roughness and other means of passive flow control to delay separation on bluff bodies is known, basic mechanisms are not well understood. Of particular interest for the current work is understanding the role of surface dimpling on boundary layers. A computational approach is employed and the study has two main goals. The first is to understand and advance the numerical methodology utilized for the computations. The second is to shed some light on the details of how surface dimples distort boundary layers and cause transition to turbulence. Simulations are performed of the flow over a simplified configuration: the flow of a boundary layer over a dimpled flat plate. The flow is modeled using an immersed boundary as a representation of the dimpled surface along with direct numerical simulation of the Navier-Stokes equations. The dimple geometry used is fixed and is that of a spherical depression in the flat plate with a depth-to-diameter ratio of 0.1. The dimples are arranged in staggered rows separated by spacing of the center of the bottom of the dimples by one diameter in both the spanwise and streamwise dimensions. The simulations are conducted for both two and three staggered rows of dimples. Flow variables are normalized at the inlet by the dimple depth and the Reynolds number is specified as 4000 (based on freestream velocity and inlet boundary layer thickness). First and second order statistics show the turbulent boundary layers correlate well to channel flow and flow of a zero pressure gradient flat plate boundary layers in the viscous sublayer and the buffer layer, but deviates further away from the wall. The forcing of transition to turbulence by the dimples is unlike the transition caused by a naturally transitioning flow, a small perturbation such as trip tape in experimental flows, or noise in the inlet condition for computational flows.
Book Synopsis A Research Program for Improving Heat Transfer Prediction for the Laminar to Turbulent Transition Region of Turbine Vanes/blades by : Frederick F. Simon
Download or read book A Research Program for Improving Heat Transfer Prediction for the Laminar to Turbulent Transition Region of Turbine Vanes/blades written by Frederick F. Simon and published by . This book was released on 1993 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transition and Turbulence Control by : Mohamed Gad-el-Hak
Download or read book Transition and Turbulence Control written by Mohamed Gad-el-Hak and published by World Scientific. This book was released on 2006 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains articles based on lectures given at the Workshop on Transition and Turbulence Control, hosted by the Institute for Mathematical Sciences, National University of Singapore, 8OCo10 December 2004. The lecturers included 13 of the worldOCOs foremost experts in the control of transitioning and turbulent flows. The chapters cover a wide range of subjects in the broad area of flow control, and will be useful to researchers working in this area in academia, government laboratories and industry. The coverage includes control theory, passive, active and reactive methods for controlling transitional and turbulent wall-bounded flows, noise suppression and mixing enhancement of supersonic turbulent jets, compliant coatings, modern flow diagnostic systems, and swept wing instabilities."
Book Synopsis Numerical Simulation of Controlled Transition to Developed Turbulence in a Zero-pressure-gradient Flat-plate Boundary Layer by : Taraneh Sayadi
Download or read book Numerical Simulation of Controlled Transition to Developed Turbulence in a Zero-pressure-gradient Flat-plate Boundary Layer written by Taraneh Sayadi and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Laminar to turbulent transition has been a subject of intensive experimental, theoretical, and numerical research. The transition process causes flow parameters such as the skin friction coefficient and heat flux to increase rapidly from their laminar values and in some cases overshoot their nominal turbulent values during late transition. Therefore, predicting transition accurately is of interest in the design and performance analysis of engineering devices such as turbomachinery and flying vehicles. Direct numerical simulations (DNS) of Klebanoff (K- ) type and Herbert (H- ) type controlled transitions are performed for compressible (Ma = 0.2), zero-pressure-gradient flat plate boundary layers. Each calculation is carried out using approximately 1.1 billion grid points, required to directly resolve the small scale turbulent structures in the near-wall region of the flow. For H-type transition, the computational domain extends from Re_theta = 210, where laminar blowing and suction excites the most unstable fundamental wave and a pair of oblique waves, to fully turbulent stage at Re_theta = 1250. The computational domain for K-type transition extends to Re_theta = 1410. The evolutions of K-type and H-type disturbances are compared and contrasted across the entire transition process. In each case localized linear disturbance is amplified through weak non-linear instability that grows into Lambda-shaped vortices with harmonic wavelength. These two calculations serve as a benchmark to assess the performance of models in predicting transition. Several subgrid scale models including, constant coefficient Smagorinsky and Vreman models and their dynamic extensions, dynamic mixed scale-similarity, dynamic one-equation kinetic energy model, and global coefficient Vreman models are applied to these transitional scenarios. We assess the capability of each model to predict the location of transition and the skin friction throughout the transition process. The constant coefficient models fail to detect transition, but the dynamic procedure, by allowing for negligible turbulent viscosity in the early transition region, result in correct prediction of the point of transition. However, after secondary instabilities set in leading to the overshoot in the skin friction profile, all models (in coarse LES calculations) fail to produce sufficient subgrid scale shear stress required for the correct prediction of skin friction and the mean velocity profile. The same underprediction of skin friction persists into the turbulent region. Modes of dynamical importance in the transitional regime of the two controlled cases are then extracted using dynamic mode decomposition (DMD). The contribution of each mode to the total Reynolds shear stress is estimated by employing the triple mode decomposition methodology. It is shown that in both transitional cases a few modes provide a good estimate of the Reynolds shear stress gradient within the transitional region. As subgrid scale models fail to produce sufficient subgrid scale shear stress to compensate for the lack of resolution, these modes can potentially be used as a reduced order representation of the transitional regime.
Book Synopsis Progress in Modeling of Laminar to Turbulent Transition on Turbine Vanes and Blades by :
Download or read book Progress in Modeling of Laminar to Turbulent Transition on Turbine Vanes and Blades written by and published by . This book was released on 1996 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transitional Boundary Layers in Aeronautics by : R. A. W. M. Henkes
Download or read book Transitional Boundary Layers in Aeronautics written by R. A. W. M. Henkes and published by North Holland. This book was released on 1996 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paperback. The book contains the proceedings of the Colloquium Transitional Boundary Layers in Aeroautics, as organized by the Royal Netherlands Academy of Arts and Sciences on 6-8 December 1995 in Amsterdam.In the external aerodynamics of aircraft, the thin boundary layer along the surface plays an important role. To a large extent, the boundary layer determines the drag of the aircraft. A better knowledge of the laminar-turbulent transition process within the boundary layer may provide technical possibilities for transition control. In this way transition can be postponed, leading to a reduction of the total drag and consequently of the fuel consumption. It is generally recognized that transition belongs to the most difficult problems in fuel mechanics. Fourteen invited papers give an overview of the state-of-the-art of transition phenomena in boundary layers along aircraft surfaces. The emphasis is on the scientific aspects of transition, but resea
Book Synopsis IUTAM Symposium on One Hundred Years of Boundary Layer Research by : Hans-Joachim Heinemann
Download or read book IUTAM Symposium on One Hundred Years of Boundary Layer Research written by Hans-Joachim Heinemann and published by Springer Science & Business Media. This book was released on 2006-12-20 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book collects peer-reviewed lectures of the IUTAM Symposium on the 100th anniversary of Boundary Layer research. No other reference of this calibre, on this topic, is likely to be published for the next decade. Covers classification, definition and mathematics of boundary layers; instability of boundary layers and transition; boundary layers control; turbulent boundary layers; numerical treatment and boundary layer modelling; special effects in boundary layers.
Book Synopsis Numerical Simulation of Boundary-layer Transition by :
Download or read book Numerical Simulation of Boundary-layer Transition written by and published by . This book was released on 1984 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
