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Numerical Simulation of Turbulent Flows and Noise Generation

2009-03-07 Technology & Engineering
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Release : 2009-03-07
Genre : Technology & Engineering
Kind : eBook
Book Rating : 561/5 ( reviews)

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Book Synopsis Numerical Simulation of Turbulent Flows and Noise Generation by : Christophe Brun

Download or read book Numerical Simulation of Turbulent Flows and Noise Generation written by Christophe Brun. This book was released on 2009-03-07. Available in PDF, EPUB and Kindle. Book excerpt: Large Eddy Simulation (LES) is a high-fidelity approach to the numerical simulation of turbulent flows. Recent developments have shown LES to be able to predict aerodynamic noise generation and propagation as well as the turbulent flow, by means of either a hybrid or a direct approach. This book is based on the results of two French/German research groups working on LES simulations in complex geometries and noise generation in turbulent flows. The results provide insights into modern prediction approaches for turbulent flows and noise generation mechanisms as well as their use for novel noise reduction concepts.

Numerical Simulation of Turbulent Flows

1971
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Release : 1971
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Book Synopsis Numerical Simulation of Turbulent Flows by : Douglas G. Fox

Download or read book Numerical Simulation of Turbulent Flows written by Douglas G. Fox. This book was released on 1971. Available in PDF, EPUB and Kindle. Book excerpt:

Research Directions in Computational Mechanics

1991-02-01 Technology & Engineering
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Release : 1991-02-01
Genre : Technology & Engineering
Kind : eBook
Book Rating : 483/5 ( reviews)

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Book Synopsis Research Directions in Computational Mechanics by : National Research Council

Download or read book Research Directions in Computational Mechanics written by National Research Council. This book was released on 1991-02-01. Available in PDF, EPUB and Kindle. Book excerpt: Computational mechanics is a scientific discipline that marries physics, computers, and mathematics to emulate natural physical phenomena. It is a technology that allows scientists to study and predict the performance of various productsâ€"important for research and development in the industrialized world. This book describes current trends and future research directions in computational mechanics in areas where gaps exist in current knowledge and where major advances are crucial to continued technological developments in the United States.

Numerical Simulation of Acoustic Propagation in a Turbulent Channel Flow with an Acoustic Liner

2018
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Release : 2018
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Book Synopsis Numerical Simulation of Acoustic Propagation in a Turbulent Channel Flow with an Acoustic Liner by : Robin Sebastian

Download or read book Numerical Simulation of Acoustic Propagation in a Turbulent Channel Flow with an Acoustic Liner written by Robin Sebastian. This book was released on 2018. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic liners are a key technology in aeronautics for the passive reduction of the noise generated by aircraft engines. They are employed in a complex flow scenario in which the acoustic waves, the turbulent flow, and the acoustic liner are interacting.During this thesis, in a context of high performance computing, a compressible Navier-Stokes solver has been developed to perform implicit large eddy simulations of a model problem of this interaction: a turbulent plane channel flow with one wall modeled as an impedance condition.As a preliminary step the wall-turbulence in rigid channel flows and associated large-scale motions are investigated. A straightforward algorithm to detect these flow features is developed and the effect of compressibility on the flow structures and their contribution to the drag are studied. Then, the interaction between the acoustic liner and turbulent flow is investigated assuming periodicity in the streamwise direction. It is shown that low resistance and low resonance frequency tend to trigger flow instability, which modifies the conventional wall-turbulence and also results in drag increase.Finally, the simulation of a spatial channel flow was addressed. In this case no periodicity is assumed and an acoustic wave can be injected at the inlet of the domain. The effect of turbulence on sound attenuation is studied without liner, before a liner is introduced on a part of the channel bottom wall. In this more realistic case, it is confirmed that low resistance acoustic liners trigger an instability at the leading edge of the liner, resulting in drag increase and excess noise generation.

Numerical Methods in Turbulence Simulation

2022-11-30 Technology & Engineering
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Release : 2022-11-30
Genre : Technology & Engineering
Kind : eBook
Book Rating : 33X/5 ( reviews)

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Book Synopsis Numerical Methods in Turbulence Simulation by : Robert Moser

Download or read book Numerical Methods in Turbulence Simulation written by Robert Moser. This book was released on 2022-11-30. Available in PDF, EPUB and Kindle. Book excerpt: Numerical Methods in Turbulence Simulation provides detailed specifications of the numerical methods needed to solve important problems in turbulence simulation. Numerical simulation of turbulent fluid flows is challenging because of the range of space and time scales that must be represented. This book provides explanations of the numerical error and stability characteristics of numerical techniques, along with treatments of the additional numerical challenges that arise in large eddy simulations. Chapters are written as tutorials by experts in the field, covering specific both contexts and applications. Three classes of turbulent flow are addressed, including incompressible, compressible and reactive, with a wide range of the best numerical practices covered. A thorough introduction to the numerical methods is provided for those without a background in turbulence, as is everything needed for a thorough understanding of the fundamental equations. The small scales that must be resolved are generally not localized around some distinct small-scale feature, but instead are distributed throughout a volume. These characteristics put particular strain on the numerical methods used to simulate turbulent flows. - Includes a detailed review of the numerical approximation issues that impact the simulation of turbulence - Provides a range of examples of large eddy simulation techniques - Discusses the challenges posed by boundary conditions in turbulence simulation and provides approaches to addressing them

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