Relevant bibliographies by topics / Ffowcs Williams-Hawkings Analogy

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  2. Dissertations / Theses
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Academic literature on the topic 'Ffowcs Williams-Hawkings Analogy'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Ffowcs Williams-Hawkings Analogy"

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Testa, C., S. Ianniello, F. Salvatore, and M. Gennaretti. "Numerical Approaches for Hydroacoustic Analysis of Marine Propellers." Journal of Ship Research 52, no. 01 (2008): 57–70. http://dx.doi.org/10.5957/jsr.2008.52.1.57.

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This paper is devoted to a theoretical and numerical hydroacoustic analysis of marine propellers. The use of the Ffowcs Williams-Hawkings equation is addressed and compared with a Bernoulli-based methodology, typically used in the naval context. A computational tool based on a boundary element formulation for the velocity potential is used to determine the hydrodynamic loads on the propeller blades. Then, both the Bernoulli and the Ffowcs Williams-Hawkings equations are used to evaluate the pressure far field. The role played by the incompressibility assumption is treated from theoretical and
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Casalino, Damiano, Marc Jacob, and Michel Roger. "Prediction of Rod-Airfoil Interaction Noise Using the Ffowcs-Williams-Hawkings Analogy." AIAA Journal 41, no. 2 (2003): 182–91. http://dx.doi.org/10.2514/2.1959.

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Dunn, Mark H. "The acoustic analogy in four dimensions." International Journal of Aeroacoustics 18, no. 8 (2019): 711–51. http://dx.doi.org/10.1177/1475472x19890259.

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The classical acoustic analogy theory is incomplete in the sense that the original research on the subject focused only on the prediction of acoustic pressure. There were no provisions for predicting the three components of acoustic velocity which are needed as input for aeroacoustic scattering applications. This is because the scalar wave equations of Lighthill and Ffowcs Williams and Hawkings were derived from the fluid conservation equations by eliminating three of the four governing differential equations from which the acoustic velocity could have been obtained. Recently developed acousti
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Lidtke, Artur K., Stephen R. Turnock, and Victor F. Humphrey. "Characterisation of sheet cavity noise of a hydrofoil using the Ffowcs Williams–Hawkings acoustic analogy." Computers & Fluids 130 (May 2016): 8–23. http://dx.doi.org/10.1016/j.compfluid.2016.02.014.

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Schoder, Stefan, Clemens Junger, and Manfred Kaltenbacher. "Computational aeroacoustics of the EAA benchmark case of an axial fan." Acta Acustica 4, no. 5 (2020): 22. http://dx.doi.org/10.1051/aacus/2020021.

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This contribution benchmarks the aeroacoustic workflow of the perturbed convective wave equation and the Ffowcs Williams and Hawkings analogy in Farassat’s 1A version for a low-pressure axial fan. Thereby, we focus on the turbulence modeling of the flow simulation and mesh convergence concerning the complete aeroacoustic workflow. During the validation, good agreement has been found with the efficiency, the wall pressure sensor signals, and the mean velocity profiles in the duct. The analysis of the source term structures shows a strong correlation to the sound pressure spectrum. Finally, both
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Epikhin, Andrey, Matvey Kraposhin, and Kirill Vatutin. "The numerical simulation of compressible jet at low Reynolds number using OpenFOAM." E3S Web of Conferences 128 (2019): 10008. http://dx.doi.org/10.1051/e3sconf/201912810008.

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The paper presents an analysis of various approaches for calculation gas-dynamic parameters and acoustic perturbations generated by a compressible jet at low Reynolds number (M = 0.9, Re = 3600). The jet flow parameters at selected conditions are well studied and can be used for validation of the numerical methods and schemes. The OpenFOAM software package with various approaches (solvers) such as pimpleCentralFoam, dbnsTurbFoam and new QGDFoam solver based on QGD-algorithms are considered. The results of time-averaged flow parameters and acoustic properties are compared with the experimental
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Najafi-Yazdi, Alireza, Guillaume A. Brès, and Luc Mongeau. "An acoustic analogy formulation for moving sources in uniformly moving media." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 467, no. 2125 (2010): 144–65. http://dx.doi.org/10.1098/rspa.2010.0172.

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Acoustic analogy methods are used as post-processing tools to predict aerodynamically generated sound from numerical solutions of unsteady flow. The Ffowcs Williams–Hawkings (FW–H) equation and related formulations, such as Farassat’s Formulations 1 and 1A, are among the commonly used analogies because of their relative low computation cost and their robustness. These formulations assume the propagation of sound waves in a medium at rest. The present paper describes a surface integral formulation based on the convective wave equation, which takes into account the presence of a mean flow. The f
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Schoder, Stefan, and Manfred Kaltenbacher. "Hybrid Aeroacoustic Computations: State of Art and New Achievements." Journal of Theoretical and Computational Acoustics 27, no. 04 (2019): 1950020. http://dx.doi.org/10.1142/s2591728519500208.

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This paper collects the state of the art and the tremendous progress that has been made in hybrid modeling of aeroacoustic sound. Hybrid modeling is defined such that flow and acoustics are modeled separate and connected by an aeroacoustic model. The contributions will be classified with respect to the aeroacoustic models being developed, covering Lighthill’s analogy, Ffowcs Williams and Hawkings, vortex sound, linearized Euler equations (LEE), and different perturbation equations modeling flow induced sound. Within each topic, specific applications, such as jet noise, aircraft noise, ground m
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Morfey, C. L., and M. C. M. Wright. "Extensions of Lighthill's acoustic analogy with application to computational aeroacoustics." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 463, no. 2085 (2007): 2101–27. http://dx.doi.org/10.1098/rspa.2007.1864.

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Lighthill's aeroacoustic analogy is formulated for bounded domains in a general way that allows pressure-based alternatives to the fluid density as wave variable. The advantage relative to the standard version (Ffowcs Williams & Hawkings 1969 Phil. Trans. R. Soc. A 264 , 321–342) is that the equivalent surface source terms needed for boundary value problems do not involve the local density. Difficulties encountered in computational aeroacoustics with standard wave extrapolation procedures, due to advection of density inhomogeneities across the control surface, are thereby avoided. Likewise
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Lallier-Daniels, Dominic, Mélanie Piellard, Bruno Coutty, and Stéphane Moreau. "Aeroacoustic study of an axial engine cooling module using lattice-Boltzmann simulations and the Ffowcs Williams and Hawkings’ analogy." European Journal of Mechanics - B/Fluids 61 (January 2017): 244–54. http://dx.doi.org/10.1016/j.euromechflu.2016.10.008.

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Dissertations / Theses on the topic "Ffowcs Williams-Hawkings Analogy"

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Souza, Daniel Sampaio. "Simulação numérica de ruído de eslate em configurações práticas usando um código comercial." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18148/tde-23072012-151309/.

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Com o desenvolvimento para aeronaves de propulsores turbo-fan com elevada razão de derivação, componentes da estrutura do avião passaram a ter relevância na geração de ruído aerodinâmico, principalmente durante a aproximação e o pouso. Dentre esses componentes, o eslate se destaca por ser uma fonte que se estende ao longo de praticamente toda a envergadura da asa. Neste trabalho, simulações numéricas foram feitas no intuito de considerar configurações práticas nas análises do ruído aeroacústico gerado pelo eslate. Um código comercial baseado no Método Lattice-Boltzmann foi usado no cálculo do
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Simões, Leandro Guilherme Crenite. "Estudo da geração de som em um eslate utilizando código comercial." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/18/18148/tde-29082013-104518/.

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Esta dissertação apresenta o desenvolvimento e otimização de uma metodologia baseada em código comercial para previsão de ruído em um eslate, além do estudo da dependência do ruído ao variar a camada limite do aerofólio. Com a contínua redução do ruído produzido por motores em aeronaves e as sucessivas restrições nos níveis de certificação, o ruído produzido por dispositivos aerodinâmicos tem ganhado importância no projeto de uma aeronave. Durante o pouso, o ruído gerado pelos dispositivos hiper-sustentadores é classificado dentre os mais relevantes, sendo o eslate um de seus componentes. Este
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Thomas, Paul Huw. "High fidelity open rotor noise prediction." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/270307.

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As improving the performance of turbofan designs becomes increasingly difficult, manufacturers are looking to new technologies for the next generation of jet engines. An 'open rotor' replaces the fan of the turbofan with a set of external rotors. This has the potential to offer a significant improvement in propulsive efficiency, but the design for low noise is a key challenge. Hence, high fidelity noise prediction methods are needed to accurately predict and compare the noise of different designs. This thesis focuses on one set of methods based on the Ffowcs Williams-Hawkings (\fwh) equation.
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Book chapters on the topic "Ffowcs Williams-Hawkings Analogy"

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Monfaredi, M., X. S. Trompoukis, K. T. Tsiakas, and K. C. Giannakoglou. "Continuous Adjoint for Aerodynamic-Aeroacoustic Optimization Based on the Ffowcs Williams and Hawkings Analogy." In Fluid-Structure-Sound Interactions and Control. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4960-5_49.

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Orselli, R. M., B. S. Carmo, J. R. Meneghini, R. L. Queiroz, and A. S. Bonatto. "Noise Predictions of the Advanced Noise Control Fan Using a Lattice Boltzmann Method and Ffowcs Williams–Hawkings Analogy." In Fluid Mechanics and Its Applications. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06260-0_36.

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Conference papers on the topic "Ffowcs Williams-Hawkings Analogy"

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Di Stefano, Danilo, Aldo Rona, Edward Hall, Christopher L. Morfey, and Guillaume Puigt. "Validating the Ffowcs Williams and Hawkings acoustic analogy implementation in Antares." In 22nd AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-3059.

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Magagnato, Franco, Esra Sorgüven, and Martin Gabi. "Far Field Noise Prediction by Large Eddy Simulation and Ffowcs Williams Hawkings Analogy." In 9th AIAA/CEAS Aeroacoustics Conference and Exhibit. American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-3206.

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Hajczak, Antoine, Laurent Sanders, Francois Vuillot, and Philippe Druault. "Investigation of the Ffowcs-Williams and Hawkings Analogy on an Isolated Landing Gear Wheel." In 2018 AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-3301.

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Galdeano, Stéphane, Sébastien Barré, and Nicolas Réau. "Noise radiated by a rod-airfoil configuration using DES and the Ffowcs-Williams & Hawkings' analogy." In 16th AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-3702.

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Argu¨elles Di´az, K. M., J. M. Ferna´ndez Oro, C. Santolaria Morros, and R. Ballesteros Tajadura. "Tonal Noise Generation in an Inlet Vaned Axial Blower at Several Axial Gaps." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90416.

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The main objective is the numerical study of the noise generation in a single stage axial flow blower. For the present work, just the discrete noise generation (tonal noise) is dealt with. A numerical methodology based on a generalization of Lighthill’s aero-acoustic analogy, the so-called Ffowcs Williams and Hawkings aero-acoustic analogy (FFWH), is developed. The numerical methodology has been tested with two different operational configurations of the blower: a first one, with a reduced axial gap between the rows of the stage (i.e. 50 mm) and a second one with a higher axial distance (i.e.
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Colin, Yann, Bastien Caruelle, and A. B. Parry. "Computational strategy for predicting CROR noise at low-speed Part III: investigation of noise radiation with the Ffowcs-Williams Hawkings analogy." In 18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference). American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-2223.

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Moroianu, Dragos¸, Arne Karlsson, and Laszlo Fuchs. "LES of the Flow and Acoustics Generated by an Aircraft Fan Running in the Vicinity of the Ground." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68397.

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An important component of the aircraft generated noise, especially ahead of it, is the fan noise created by the high velocity variation near the blades and the interaction of the rotating fan with the fluid. In order to predict the sound, the method used involves the acoustical analogy developed by Ffowcs Williams and Hawkings. Computation of the flow field is performed in the incompressible LES framework, while the noise is evaluated using a non-homogeneous wave equation. In this work the influence of the angle between the fan and ground, on the total sound spectrum, the noise generation and
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Sorguven, Esra, Yilmaz Dogan, Faruk Bayraktar, and Ergin Arslan. "Computational Noise Prediction of a Centrifugal Fan." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41842.

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In this study, computational aeroacoustics methods are employed to analyze the flow and the noise emission in a centrifugal fan. Unsteady flow inside the centrifugal fan is predicted with large eddy simulation. Acoustic sources are computed based on the results of the time-dependent flow simulation. The turbulent pressure fluctuations on the blades and on the volute of the fan are used as the source terms in the acoustic analogy of Ffowcs Williams and Hawkings. Propagation, diffraction and scattering of the acoustic sources inside the volute are computed with the boundary element method. Numer
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Ranft, Kirsten, Ali A. Ameri, J. Iwan D. Alexander, and Edmane Envia. "Acoustic Analysis of the NREL Phase VI Wind Turbine." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23785.

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The aim of this work is to predict the aerodynamic noise emitted from the NREL Phase VI Wind Turbine [1]. Specifically rotational noise and broadband noise of the blade have been investigated. The approach to predict aeroacoustic noise is based on the acoustic analogy [2]. In acoustic analogy, the sources of aerodynamic noise are derived from the flow equations and the resulting radiated noise is calculated using the Ffowcs Williams and Hawkings equation [3]. Thus, the prediction of aerodynamic noise requires an accurate solution of the flow field. In this work the flow field around the blade
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Grönman, Aki, Jari Backman, and Anna Avramenko. "Wind Profile Effect on Small Wind Turbine Noise Generation." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25622.

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Small wind turbines are usually located close to buildings, and therefore, the noise generation can be both annoying and a risk for the health. The number of wind turbine installations is growing, and the request for distributed small scale energy production is one of the future trends in the energy market. The wind behavior is usually non-linear close to the ground surface. Especially, small turbines with low nacelle heights have a relatively declined wind profile at the blades. The chosen modeling approach coupled three-dimensional RANS with the Ffowcs Williams-Hawkings acoustic analogy. A s
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