Michael Leschziner – författare

This book is intended for self-study or as a companion of lectures delivered to post-graduate students on the subject of the computational prediction of complex turbulent flows. There are several books in the extensive literature on turbulence that deal, in statistical terms, with the phenomenon itself, as well its many manifestations in the context of fluid dynamics. Statistical Turbulence Modelling for Fluid Dynamics — Demystified differs from these and focuses on the physical interpretation of a broad range of mathematical models used to represent the time-averaged effects of turbulence in computational prediction schemes for fluid flow and related transport processes in engineering and the natural environment. It dispenses with complex mathematical manipulations and instead gives physical and phenomenological explanations. This approach allows students to gain a 'feel' for the physical fabric represented by the mathematical structure that describes the effects of turbulence and the models embedded in most of the software currently used in practical fluid-flow predictions, thus counteracting the ill-informed black-box approach to turbulence modelling. This is done by taking readers through the physical arguments underpinning exact concepts, the rationale of approximations of processes that cannot be retained in their exact form, and essential calibration steps to which the resulting models are subjected by reference to theoretically established behaviour of, and experimental data for, key canonical flows.

This book is intended for self-study or as a companion of lectures delivered to post-graduate students on the subject of the computational prediction of complex turbulent flows. There are several books in the extensive literature on turbulence that deal, in statistical terms, with the phenomenon itself, as well its many manifestations in the context of fluid dynamics. Statistical Turbulence Modelling for Fluid Dynamics — Demystified differs from these and focuses on the physical interpretation of a broad range of mathematical models used to represent the time-averaged effects of turbulence in computational prediction schemes for fluid flow and related transport processes in engineering and the natural environment. It dispenses with complex mathematical manipulations and instead gives physical and phenomenological explanations. This approach allows students to gain a 'feel' for the physical fabric represented by the mathematical structure that describes the effects of turbulence and the models embedded in most of the software currently used in practical fluid-flow predictions, thus counteracting the ill-informed black-box approach to turbulence modelling. This is done by taking readers through the physical arguments underpinning exact concepts, the rationale of approximations of processes that cannot be retained in their exact form, and essential calibration steps to which the resulting models are subjected by reference to theoretically established behaviour of, and experimental data for, key canonical flows.

This book provides an engaging and descriptive introduction to the extensive and wide-ranging world of fluid flows in nature and engineering, exploring their critical role in our lives. The diverse mechanisms behind observable phenomena and the properties of fluid motion are illuminated and linked to a wide variety of flows, laying a solid foundation for a deeper appreciation of fluid dynamics.While the science underpinning these phenomena is inherently mathematical, this book intentionally avoids all but the most easily understood general principles. Instead, it provides a descriptive coverage of the subject without trivialising or infantilising it. The text is richly illustrated with photos, diagrams and sketches, each paired with explanations of the key features within each figure. Supporting the discussion of these fundamental and overarching mechanisms, numerous real-world examples are showcased, including environmental flows, weather phenomena, physiological flows and engineering applications. Individual sections cover flows related to aircraft, cars, jet engines, wind turbines, propellers, cyclones, water-distribution networks, water waves, sailing boats, heat exchangers, nuclear reactors, artificial heart valves, urban fluid dynamics and even competitive sports like cycling and skiing.This book is a perfect first exposure to fluid flows and fluid mechanics for the scientifically curious non-specialists, as well as for prospective and beginner science and engineering students.

This book provides an engaging and descriptive introduction to the extensive and wide-ranging world of fluid flows in nature and engineering, exploring their critical role in our lives. The diverse mechanisms behind observable phenomena and the properties of fluid motion are illuminated and linked to a wide variety of flows, laying a solid foundation for a deeper appreciation of fluid dynamics.While the science underpinning these phenomena is inherently mathematical, this book intentionally avoids all but the most easily understood general principles. Instead, it provides a descriptive coverage of the subject without trivialising or infantilising it. The text is richly illustrated with photos, diagrams and sketches, each paired with explanations of the key features within each figure. Supporting the discussion of these fundamental and overarching mechanisms, numerous real-world examples are showcased, including environmental flows, weather phenomena, physiological flows and engineering applications. Individual sections cover flows related to aircraft, cars, jet engines, wind turbines, propellers, cyclones, water-distribution networks, water waves, sailing boats, heat exchangers, nuclear reactors, artificial heart valves, urban fluid dynamics and even competitive sports like cycling and skiing.This book is a perfect first exposure to fluid flows and fluid mechanics for the scientifically curious non-specialists, as well as for prospective and beginner science and engineering students.

This volume contains contributions to the BRI-TE/EURAM, Area 5, Pilot phase programme on the validation of computational fluid dynamics (CFD) codes, EUROVAL. Two- and three-dimensional flows are investigated with particular emphasis on precise comparison against measurements, with special attention paid to the validation of turbulence models investigated by the 16 project partners. The main part of this volume is designated to the validation of turbulence models on a boundary layer and Navier-Stokes basis, presented in an application-oriented structure for single- and two-element aerofoils, internal flow over bumps, wind-tunnel-interference problems and a vortex breakdown study.