Download or read book Studies of Turbulent Boundary Layer Flow Through Direct Numerical Simulation by Martin Skote written by Martin Skote and published by . This book was released on 2001 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies of Turbulent Boundary Layer Flow Through Direct Numerical Simulation written by and published by . This book was released on 2001 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct Numerical Simulations of Compressible Turbulent Boundary Layers Using Hybrid Methods written by Debra J. Olejniczak and published by . This book was released on 1998 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Study of a Three Dimensional Turbulent Boundary Layer written by and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of transverse strain on an initially two-dimensional turbulent boundary layer are studied in a direct numerical simulation of a planar channel flow with impulsively started transverse pressure gradient. Consistent with experiments in three-dimensional boundary layers, the simulation shows a decrease in the Reynolds shear stress with increasing transverse strain. Also, the directions of the Reynolds shear stress vector and the mean velocity gradient vector were found to differ. In addition, the simulation shows a drop in the turbulent kinetic energy. Terms in the Reynolds stress transport equations were computed. The balances indicate that the decrease in turbulent kinetic energy is a result of a decrease in turbulence production, along with an increase in turbulent dissipation. The effects of the transverse pressure gradient on the instantaneous flow structures were investigated.
Download or read book Studying Turbulence Using Numerical Simulation Databases written by and published by . This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Turbulence Over a Compliant Surface written by Sheng Xu and published by . This book was released on 2002 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct Numerical Simulation of Turbulent Boundary Layers with Adverse Pressure Gradient and Separation written by Yang Na and published by . This book was released on 1996 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Turbulent Boundary Layers written by Tuncer Cebeci and published by Elsevier. This book was released on 2012-12-02 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of Turbulent Boundary Layers focuses on turbulent flows meeting the requirements for the boundary-layer or thin-shear-layer approximations. Its approach is devising relatively fundamental, and often subtle, empirical engineering correlations, which are then introduced into various forms of describing equations for final solution. After introducing the topic on turbulence, the book examines the conservation equations for compressible turbulent flows, boundary-layer equations, and general behavior of turbulent boundary layers. The latter chapters describe the CS method for calculating two-dimensional and axisymmetric laminar and turbulent boundary layers. This book will be useful to readers who have advanced knowledge in fluid mechanics, especially to engineers who study the important problems of design.
Download or read book Studying Turbulence Using Numerical Simulation Databases 4 Proceedings of the 1992 Summer Program written by and published by . This book was released on 1992 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer written by Cedrick Ansorge and published by Springer. This book was released on 2016-10-04 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Boundary Layer Flows written by Vallampati Ramachandra Prasad and published by BoD – Books on Demand. This book was released on 2020-01-22 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by experts in the field, this book, "Boundary Layer Flows - Theory, Applications, and Numerical Methods" provides readers with the opportunity to explore its theoretical and experimental studies and their importance to the nonlinear theory of boundary layer flows, the theory of heat and mass transfer, and the dynamics of fluid. With the theory's importance for a wide variety of applications, applied mathematicians, scientists, and engineers - especially those in fluid dynamics - along with engineers of aeronautics, will undoubtedly welcome this authoritative, up-to-date book.
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.
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:
Download or read book Direct Numerical Simulation of Boundary layer Flow Over Surface Roughness written by Russell Gerard De Anna and published by . This book was released on 1993 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation of the Invariants of the Velocity Gradient Tensor in Transitioning and Turbulent Boundary Layer Flow Using Direct Numerical Simulation written by C. J. Bulbeck and published by . This book was released on 1998 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spatial Direct Numerical Simulation of Compressible Boundary Layer Flow written by Bono Wasistho and published by . This book was released on 1997 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book DNS of Wall Bounded Turbulent Flows written by Tapan K. Sengupta and published by Springer. This book was released on 2019-02-09 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights by careful documentation of developments what led to tracking the growth of deterministic disturbances inside the shear layer from receptivity to fully developed turbulent flow stages. Associated theoretical and numerical developments are addressed from basic level so that an uninitiated reader can also follow the materials which lead to the solution of a long-standing problem. Solving Navier-Stokes equation by direct numerical simulation (DNS) from the first principle has been considered as one of the most challenging problems of understanding what causes transition to turbulence. Therefore, this book is a very useful addition to advanced CFD and advanced fluid mechanics courses.
