Tag: Flows

January 1, 2024

Noise Sources in Turbulent Shear Flows Fundamentals and Applications

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Free Download Noise Sources in Turbulent Shear Flows: Fundamentals and Applications by Roberto Camussi
English | PDF | 2013 | 453 Pages | ISBN : 3709114578 | 9.5 MB
The articles in this volume present the state-of-the-art in noise prediction, modeling and measurement. The articles are partially based on class notes provided during the course `Noise sources in turbulent shear flows’, given at CISM on April 2011. The first part contains general concepts of aero acoustics, including vortex sound theory and acoustic analogies, in the second part particular emphasis is put into arguments of interest for engineers and relevant for aircraft design: jet noise, airfoil broadband noise, boundary layer noise (including interior noise and its control) and the concept of noise sources, their theoretical modeling and identification in turbulent lows. All these arguments are treated extensively with the inclusion of many practical examples and references to engineering applications.

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January 1, 2024

Computation of Viscous Incompressible Flows

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Free Download Computation of Viscous Incompressible Flows by Dochan Kwak , Cetin C. Kiris
English | PDF (True) | 2011 | 294 Pages | ISBN : 9400701926 | 15.3 MB
This monograph is intended as a concise and self-contained guide to practitioners and graduate students for applying approaches in computational fluid dynamics (CFD) to real-world problems that require a quantification of viscous incompressible flows. In various projects related to NASA missions, the authors have gained CFD expertise over many years by developing and utilizing tools especially related to viscous incompressible flows. They are looking at CFD from an engineering perspective, which is especially useful when working on real-world applications. From that point of view, CFD requires two major elements, namely methods/algorithm and engineering/physical modeling. As for the methods, CFD research has been performed with great successes. In terms of modeling/simulation, mission applications require a deeper understanding of CFD and flow physics, which has only been debated in technical conferences and to a limited scope. This monograph fills the gap by offering in-depth examples for students and engineers to get useful information on CFD for their activities. The procedural details are given with respect to particular tasks from the authors’ field of research, for example simulations of liquid propellant rocket engine subsystems, turbo-pumps and the blood circulations in the human brain as well as the design of artificial heart devices. However, those examples serve as illustrations of computational and physical challenges relevant to many other fields. Unlike other books on incompressible flow simulations, no abstract mathematics are used in this book. Assuming some basic CFD knowledge, readers can easily transfer the insights gained from specific CFD applications in engineering to their area of interest.

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December 29, 2023

Non-Equilibrium Reacting Gas Flows Kinetic Theory of Transport and Relaxation Processes

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Free Download Ekaterina Nagnibeda, Elena Kustova, "Non-Equilibrium Reacting Gas Flows: Kinetic Theory of Transport and Relaxation Processes"
English | 2009 | pages: 255 | ISBN: 3642013899 | PDF | 3,2 mb
In the present monograph, we develop the kinetic theory of transport phenomena and relaxation processes in the flows of reacting gas mixtures and discuss its applications to strongly non-equilibrium conditions. The main attention is focused on the influence of non-equilibrium kinetics on gas dynamics and transport properties. Closed systems of fluid dynamic equations are derived from the kinetic equations in different approaches. We consider the most accurate approach taking into account the state-to-state kinetics in a flow, as well as simplified multi-temperature and one-temperature models based on quasi-stationary distributions. Within these approaches, we propose the algorithms for the calculation of the transport coefficients and rate coefficients of chemical reactions and energy exchanges in non-equilibrium flows; the developed techniques are based on the fundamental kinetic theory principles. The theory is applied to the modeling of non-equilibrium flows behind strong shock waves, in the boundary layer, and in nozzles. The comparison of the results obtained within the frame of different approaches is presented, the advantages of the new state-to-state kinetic model are discussed, and the limits of validity for simplified models are established.

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December 25, 2023

Simplifying Android Development with Coroutines and Flows

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Free Download Simplifying Android Development with Coroutines and Flows: Learn how to use Kotlin coroutines and the flow API to handle data streams asynchronously in your Android app by Jomar Tigcal, Aileen Apolo-de Jesus
English | July 27, 2022 | ISBN: 1801816247 | 164 pages | MOBI | 2.05 Mb
Get to grips with asynchronous programming in Android using simple, modern, and testable code through Kotlin coroutines and flow

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September 28, 2023

The Origin of Turbulence in Near-Wall Flows

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Free Download The Origin of Turbulence in Near-Wall Flows by Andrey V. Boiko , Genrih R. Grek , Alexander V. Dovgal , Victor V. Kozlov
English | PDF (True) | 2002 | 273 Pages | ISBN : 3540421815 | 29.9 MB
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.

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