Development Of A Cfd Compatible Transition Model Based On Linear Stability Theory
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| Author | : James Coder |
| Publisher | : |
| Total Pages | : |
| Release | : 2014 |
| Genre | : |
| ISBN | : |
A new laminar-turbulent transition model for low-turbulence external aerodynamic applications is presented that incorporates linear stability theory in a manner compatible with modern computational fluid dynamics solvers. The model uses a new transport equation that describes the growth of the maximum Tollmien-Schlichting instability amplitude in the presence of a boundary layer. To avoid the need for integration paths and non-local operations, a locally defined non-dimensional pressure-gradient parameter is used that serves as an estimator of the integral boundary-layer properties. The model has been implemented into the OVERFLOW 2.2f solver and interacts with the Spalart-Allmaras and Menter SST eddy-viscosity turbulence models. Comparisons of predictions using the new transition model with high-quality wind-tunnel measurements of airfoil section characteristics validate the predictive qualities of the model. Predictions for three-dimensional aircraft and wing geometries show the correct qualitative behavior even though limited experimental data are available. These cases also demonstrate that the model is well-behaved about general aeronautical configurations. These cases confirm that the new transition model is an improvement over the current state of the art in computational fluid dynamics transition modeling by providing more accurate solutions at approximately half the added computational expense.
| Author | : Vallampati Ramachandra Prasad |
| Publisher | : BoD – Books on Demand |
| Total Pages | : 236 |
| Release | : 2020-01-22 |
| Genre | : Mathematics |
| ISBN | : 1839681853 |
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.
| Author | : Yannick Hoarau |
| Publisher | : Springer Nature |
| Total Pages | : 412 |
| Release | : 2019-11-01 |
| Genre | : Technology & Engineering |
| ISBN | : 3030276074 |
This book gathers the proceedings of the Seventh Symposium on Hybrid RANS-LES Methods, which was held on September 17-19 in Berlin, Germany. The different chapters, written by leading experts, reports on the most recent developments in flow physics modelling, and gives a special emphasis to industrially relevant applications of hybrid RANS-LES methods and other turbulence-resolving modelling approaches. The book addresses academic researchers, graduate students, industrial engineers, as well as industrial R&D managers and consultants dealing with turbulence modelling, simulation and measurement, and with multidisciplinary applications of computational fluid dynamics (CFD), such as flow control, aero-acoustics, aero-elasticity and CFD-based multidisciplinary optimization. It discusses in particular advanced hybrid RANS-LES methods. Further topics include wall-modelled Large Eddy Simulation (WMLES) methods, embedded LES, Lattice-Bolzman methods and turbulence-resolving applications and a comparison of the LES methods with both hybrid RANS-LES and URANS methods. Overall, the book provides readers with a snapshot on the state-of-the-art in CFD and turbulence modelling, with a special focus to hybrid RANS-LES methods and their industrial applications.
| Author | : Spencer Sherwin |
| Publisher | : Springer Nature |
| Total Pages | : 809 |
| Release | : 2021-07-30 |
| Genre | : Computers |
| ISBN | : 3030679020 |
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.
| Author | : Chunhua Sheng |
| Publisher | : Springer |
| Total Pages | : 140 |
| Release | : 2016-11-26 |
| Genre | : Technology & Engineering |
| ISBN | : 3319325760 |
This book provides a comprehensive description of numerical methods and validation processes for predicting transitional flows based on the Langtry–Menter local correlation-based transition model, integrated with both one-equation Spalart–Allmaras (S–A) and two-equation Shear Stress Transport (SST) turbulence models. A comparative study is presented to combine the respective merits of the two coupling methods in the context of predicting the boundary-layer transition phenomenon from fundamental benchmark flows to realistic helicopter rotors. The book will of interest to industrial practitioners working in aerodynamic design and the analysis of fixed-wing or rotary wing aircraft, while also offering advanced reading material for graduate students in the research areas of Computational Fluid Dynamics (CFD), turbulence modeling and related fields.
| Author | : Peter J. Schmid |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 561 |
| Release | : 2012-12-06 |
| Genre | : Science |
| ISBN | : 1461301858 |
A detailed look at some of the more modern issues of hydrodynamic stability, including transient growth, eigenvalue spectra, secondary instability. It presents analytical results and numerical simulations, linear and selected nonlinear stability methods. By including classical results as well as recent developments in the field of hydrodynamic stability and transition, the book can be used as a textbook for an introductory, graduate-level course in stability theory or for a special-topics fluids course. It is equally of value as a reference for researchers in the field of hydrodynamic stability theory or with an interest in recent developments in fluid dynamics. Stability theory has seen a rapid development over the past decade, this book includes such new developments as direct numerical simulations of transition to turbulence and linear analysis based on the initial-value problem.
| Author | : Jingyu Wang |
| Publisher | : |
| Total Pages | : 206 |
| Release | : 2014 |
| Genre | : Computational fluid dynamics |
| ISBN | : |
Computational Fluid Dynamics (CFD) has been widely used in scientific research and engineering designs of aerospace vehicles. However, most Reynolds-averaged Navier-Stokes CFD applications today still assume fully turbulent flows, and so are unable to capture the boundary layer transition phenomenon. In the present study, the Local Correlation-based Transition Model (LCTM) was investigated and implemented in an unstructured CFD solver - U2NCLE, which is coupled with both one-equation Spalart-Allmaras (S-A) and two-equations Shear Stress Transport (SST) turbulence models. An innovative method was developed to evaluate the local free stream turbulence intensity for the transition model coupled with the S-A turbulence model. The current transition model was systematically validated on several benchmark cases including a flat plate with and without pressure gradients, two-dimensional airfoils, and realistic three-dimensional helicopter rotors. Both the S-A and SST based transition models were also used to predict the aerodynamic interactions in a lift fan configuration, to further explore the unsteady aerodynamic phenomena for internal viscous flows.
| Author | : Tuncer Cebeci |
| Publisher | : Elsevier |
| Total Pages | : 423 |
| Release | : 2012-12-02 |
| Genre | : Technology & Engineering |
| ISBN | : 0323151051 |
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.
| Author | : M. Hallbäck |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 379 |
| Release | : 2013-03-09 |
| Genre | : Science |
| ISBN | : 9401586667 |
The aim of this book is to give, within a single volume, an introduction to the fields of turbulence modelling and transition-to-turbulence prediction, and to provide the physical background for today's modelling approaches in these problem areas as well as giving a flavour of advanced use of prediction methods. Turbulence modelling approaches, ranging from single-point models based on the eddy-viscosity concept and the Reynolds stress transport equations (Chapters 3,4,5), to large-eddy simulation (LES) techniques (Ch. 7), are covered. The foundations of hydrodynamical stability and transition are presented (Ch. 2) along with transition prediction methods based on single-point closures (Ch. 6), LES techniques (Ch. 7) and the parabolized stability equations (Ch. 8). The book addresses engineers and researchers, in industry or academia, who are entering into the fields of turbulence or transition modelling research or need to apply turbulence or transition prediction methods in their work.
| Author | : Mustafa Serdar Genç |
| Publisher | : BoD – Books on Demand |
| Total Pages | : 176 |
| Release | : 2012-04-04 |
| Genre | : Science |
| ISBN | : 9535104926 |
This book reports the latest development and trends in the low Re number aerodynamics, transition from laminar to turbulence, unsteady low Reynolds number flows, experimental studies, numerical transition modelling, control of low Re number flows, and MAV wing aerodynamics. The contributors to each chapter are fluid mechanics and aerodynamics scientists and engineers with strong expertise in their respective fields. As a whole, the studies presented here reveal important new directions toward the realization of applications of MAV and wind turbine blades.
