Relevant bibliographies by topics / Ffowcs Williams-Hawkings

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

Author: Grafiati
Published: 4 June 2021
Last updated: 26 July 2025

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Journal articles on the topic "Ffowcs Williams-Hawkings"

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Souliez, F. J., L. N. Long, P. J. Morris, and A. Sharma. "Landing Gear Aerodynamic Noise Prediction Using Unstructured Grids." International Journal of Aeroacoustics 1, no. 2 (2002): 115–35. http://dx.doi.org/10.1260/147547202760236932.

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Aerodynamic noise from a landing gear in a uniform flow is computed using the Ffowcs Williams-Hawkings (FW-H) equation. The time accurate flow data on the integration surface is obtained using a finite volume low-order flow solver on an unstructured grid. The Ffowcs Williams-Hawkings equation is solved using surface integrals over the landing gear surface and over a permeable surface away from the landing gear. Two geometric configurations are tested in order to assess the impact of two lateral struts on the sound level and directivity in the far-field. Predictions from the Ffowcs Williams-Haw
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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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Ianniello, Sandro. "Quadrupole Noise Predictions Through the Ffowcs Williams-Hawkings Equation." AIAA Journal 37, no. 9 (1999): 1048–54. http://dx.doi.org/10.2514/2.832.

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Ianniello, Sandro. "Quadrupole noise predictions through the Ffowcs Williams-Hawkings equation." AIAA Journal 37 (January 1999): 1048–54. http://dx.doi.org/10.2514/3.14287.

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Ikeda, Tomoaki, Shunji Enomoto, Kazuomi Yamamoto, and Kazuhisa Amemiya. "Quadrupole Corrections for the Permeable-Surface Ffowcs Williams–Hawkings Equation." AIAA Journal 55, no. 7 (2017): 2307–20. http://dx.doi.org/10.2514/1.j055328.

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GUO, Y. P. "Application of the Ffowcs Williams/Hawkings equation to two-dimensional problems." Journal of Fluid Mechanics 403 (January 25, 2000): 201–21. http://dx.doi.org/10.1017/s0022112099006989.

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This paper discusses the application of the Ffowcs Williams/Hawkings equation to two-dimensional problems. A two-dimensional version of this equation is derived, which not only provides a very efficient way for numerical implementation, but also reveals explicitly the features of the source mechanisms and the characteristics of the far-field noise associated with two-dimensional problems. It is shown that the sources can be interpreted, similarly to those in three-dimensional spaces, as quadrupoles from turbulent flows, dipoles due to surface pressure fluctuations on the bodies in the flow and
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Zhou, Zhiteng, Hongping Wang, and Shizhao Wang. "Simplified permeable surface correction for frequency-domain Ffowcs Williams and Hawkings integrals." Theoretical and Applied Mechanics Letters 11, no. 4 (2021): 100259. http://dx.doi.org/10.1016/j.taml.2021.100259.

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Chen, Zhibo, and Aaron Towne. "An azimuthal Fourier domain formulation of the Ffowcs Williams and Hawkings equation." Journal of the Acoustical Society of America 150, no. 3 (2021): 1967–78. http://dx.doi.org/10.1121/10.0006234.

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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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Ianniello, Sandro. "Algorithm to Integrate the Ffowcs Williams-Hawkings Equation on Supersonic Rotating Domain." AIAA Journal 37, no. 9 (1999): 1040–47. http://dx.doi.org/10.2514/2.831.

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

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ROCCA, ANDREA. "Computational hydroacoustic analysis of the BB2 submarine using the advective Ffowcs Williams and Hawkings equation with Wall-Modeled LES." Doctoral thesis, Università degli Studi di Trieste, 2020. http://hdl.handle.net/11368/2975366.

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Il lavoro di ricerca riportato nella presente tesi riguarda la caratterizzazione idrodinamica e idroacustica di una geometria non classificata di sottomarino, tramite simulazioni numeriche. La geometria in esame è il modello sviluppato dal "Defence Science and Technology Organization", noto come BB2. Questo modello è rappresentativo di un sottomarino diesel, con un largo "casing", due timoni anteriori posizionati sulla torretta e quattro timoni posteriori disposti ad "X". Le simulazioni sono state effettuate in scala modello e le condizioni di flusso sono quelle di un classico test in galleria
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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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Pignier, Nicolas. "Sound propagation from sustainable ground vehicles : from aeroacoustic sources to urban noise." Licentiate thesis, KTH, Farkost och flyg, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-174182.

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Transportation is the main source of environmental noise in Europe, with an estimated 125 million people affected by excessive noise levels from road traffic, causing a burden of noise related diseases and having a substantial economic impact on society. In order to reduce exposure to high levels of traffic noise, two approaches are the topic of extensive research: preventing sound from propagating from roads and railways using for example noise barriers, and reducing the sources of noise themselves. The second solution, which addresses directly the cause of the problem, requires improved desi
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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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Hammar, Johan. "A Wave Expansion Method for Aeroacoustic Propagation." Licentiate thesis, KTH, Aerodynamik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-196689.

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Although it is possible to directly solve an entire flow-acoustics problem in one computation, this approach remains prohibitively large in terms of the computational resource required for most practical applications. Aeroacoustic problems are therefore usually split into two parts; one consisting of the source computation and one of the source propagation. Although both these parts entail great challenges on the computational method, in terms of accuracy and efficiency, it is still better than the direct solution alternative. The source usually consists of highly turbulent flows, which for mo
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Biancherin, Anthoine. "Simulation aéroacoustique d'un jet chaud subsonique." Paris 6, 2003. http://www.theses.fr/2003PA066361.

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Pignier, Nicolas. "Predicting the sound field from aeroacoustic sources on moving vehicles : Towards an improved urban environment." Doctoral thesis, KTH, Farkost och flyg, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-205791.

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In a society where environmental noise is becoming a major health and economical concern, sound emissions are an increasingly critical design factor for vehicle manufacturers. With about a quarter of the European population living close to roads with heavy traffic, traffic noise in urban landscapes has to be addressed first. The current introduction of electric vehicles on the market and the need for sound systems to alert their presence is causing a shift in mentalities requiring engineering methods that will have to treat noise management problems from a broader perspective. That in which no
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Bonneau, Virginie. "Prévision du bruit d'interaction tonal et à large bande d'une soufflante de nouvelle génération en régime subsonique." Thesis, Poitiers, 2015. http://www.theses.fr/2015POIT2272.

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La soufflante de la nouvelle génération de moteurs Snecma est caractérisée par des pales de rotor aux bords de fuite épais, ainsi que par un OGV hétérogène intégrant les bras supports.L’objectif de cette thèse est de caractériser l’influence de ces innovations technologiques sur la génération des sources et le rayonnement sonore dans la manche secondaire liés à l’interaction du sillage du rotor avec l’OGV. Ce mécanisme est principalement responsable des émissions tonales et à large bande qui sont traitées indépendamment. D’une part, une simulation URANS de l’étage rotor-stator fournit les sour
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Dofek, Ivan. "Parametrická tvarová optimalizace letounu z aerodynamického hlediska." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-234201.

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The work deals with the use of geometric parameterization for shape description of some parts of the airplane. Geometric parametrization is used for creating a parametric model airfoil. This parametric model allows local deformations pobrchu profile and can easily be applied to generate the geometry of the wing or other parts letoumu. Some properties of the parametric model were tested applications in aerodynamic optimization. Furthermore, the work deals with the parametric description of the blades, the aerodynamic optimization and noise analysis. For propeller blade were created distribution
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Book chapters on the topic "Ffowcs Williams-Hawkings"

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Farassat, F. "The Ffowcs Williams-Hawkings Equation — Fifteen Years of Research." In Aero- and Hydro-Acoustics. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82758-7_16.

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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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Caraeni, Mirela, Alastair West, and Doru Caraeni. "Turbulent Jet Noise Simulation and Propagation Using a 3rd Order MUSCL/CD Scheme on Unstructured Grid and Ffowcs-Williams Hawkings." In Springer Proceedings in Physics. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30602-5_49.

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Glegg, Stewart, and William Devenport. "The Ffowcs Williams and Hawkings equation." In Aeroacoustics of Low Mach Number Flows. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-12-809651-2.00005-9.

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Glegg, Stewart, and William Devenport. "The Ffowcs Williams and Hawkings equation." In Aeroacoustics of Low Mach Number Flows. Elsevier, 2024. http://dx.doi.org/10.1016/b978-0-443-19112-1.00020-5.

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Bulut Sertac and Ergin Selma. "An Investigation on the Effects of Various Flow Parameters on the Underwater Flow Noise." In Technology and Science for the Ships of the Future. IOS Press, 2018. https://doi.org/10.3233/978-1-61499-870-9-133.

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The prediction and reduction of underwater noise is commercially, militarily and ecologically a very critical issue for maritime industry. Machine noise, propeller noise and flow noise are the main components of underwater noise for submerged bodies. Especially at high flow velocities, flow noise becomes dominant source of underwater noise radiated from these bodies. In this paper, the effects of the fluid temperature and salinity of the fluid on the underwater flow noise are investigated, numerically. A circular cylinder is selected for the validation studies of the noise model used in the ac
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Cianferra Marta, Petronio Andrea, and Armenio Vincenzo. "Hydrodynamic Noise from a Propeller in Open Sea Condition." In Technology and Science for the Ships of the Future. IOS Press, 2018. https://doi.org/10.3233/978-1-61499-870-9-149.

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In the present work a hybrid methodology is used to evaluate the hydrodynamic noise generated by a marine propeller in open sea condition. The hydrodynamic field is computed using Large Eddy simulation under the assumption of incompressible flow field; the acoustic field is reconstructed by applying the advective Ffowcs Williams and Hawkings equation. For the hydrodynamics, we use the dynamic Lagrangian model for the closure of the subgrid-scale stresses and a wall-layer model to skip the resolution of the viscous sub-layer. We consider a propeller well studied in literature for a single value
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Conference papers on the topic "Ffowcs Williams-Hawkings"

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Lopes, Leonard, Karl Wiedemann, D. Douglas, and Douglas Nark. "Identification of Spurious Signals from Permeable Ffowcs Williams and Hawkings Surfaces." In Vertical Flight Society 73rd Annual Forum & Technology Display. The Vertical Flight Society, 2017. http://dx.doi.org/10.4050/f-0073-2017-12282.

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Integral forms of the permeable surface formulation of the Ffowcs Williams and Hawkings (FW-H) equation often require an input in the form of a near field Computational Fluid Dynamics (CFD) solution to predict noise in the near or far field from various types of geometries. The FW-H equation involves three source terms; two surface terms (monopole and dipole) and a volume term (quadrupole). Many solutions to the FW-H equation, such as several of Farassat's formulations, neglect the quadrupole term. Neglecting the quadrupole term in permeable surface formulations leads to inaccuracies called sp
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Zawodny, Nikolas, and D. Douglas. "Investigation of Rotor-Airframe Interaction Noise Associated with Small-Scale Rotary-Wing Unmanned Aircraft Systems." In Vertical Flight Society 73rd Annual Forum & Technology Display. The Vertical Flight Society, 2017. http://dx.doi.org/10.4050/f-0073-2017-12283.

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In this study, hover acoustic measurements are taken on isolated rotor-airframe configurations representative of smallscale, rotary-wing unmanned aircraft systems (UAS). Each rotor-airframe configuration consists of two fixed-pitch blades powered by a brushless motor, with a simplified airframe geometry intended to represent a generic multicopter arm. In addition to acoustic measurements, CFD-based aeroacoustic predictions are implemented on a subset of the experimentally tested rotor-airframe configurations in an effort to better understand the noise content of the rotor-airframe systems. Fav
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YÜCEKAYALI, Arda, Erdem AYAN, and Yüksel ORTAKAYA. "Acoustic Assessment of 3 Meter Radius Rotor with Whirl Tower Test and Analysis." In Vertical Flight Society 70th Annual Forum & Technology Display. The Vertical Flight Society, 2014. http://dx.doi.org/10.4050/f-0070-2014-9410.

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Acoustic characterization of the indigenously designed 3 meter radius main rotor, which is designed for light weight helicopters, at hover conditions is performed by tests and analyses. Tests are conducted on the in house designed whirl tower, TWT (TAI Whirl Tower), at various rotational speeds and collective pitch settings. Effect of varying rotational speed and collective setting on cumulative rotor noise and sound power level (SPL) - frequency spectrum are measured with vertically oriented microphone array. Ffowcs Williams-Hawkings (FW-H) equations are solved with in-house developed acousti
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Zhu, Zheng, and QiJun Zhao. "Numerical Optimization for Rotor Blade-tip Planform with Low HSI Noise Characteristics in Forward Flight." In Vertical Flight Society 71st Annual Forum & Technology Display. The Vertical Flight Society, 2015. http://dx.doi.org/10.4050/f-0071-2015-10070.

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Based on CFD/FW-H_pds methods and hybrid optimization technique, an optimization design procedure for rotor planform with low HSI noise characteristics is established. In this solver, based on the moving-embedded grid methodology, a CFD simulation method for the aerodynamic characteristics of rotor is developed by solving the compressible Reynolds-averaged Navier-Stokes (RANS) equations. Among the optimization process, the high-qualified blade grids are generated by a high-efficient parameterized method. Additionally, the high-speed impulsive (HSI) noise characteristics generated by transonic
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Xi, Chen, Zhao Qi-Jun, Ma Yi-Yang, and Wang Bo. "Mechanism Analyses on Aeroacoustic Characteristics of Iced Rotor for Ice Detection." In Vertical Flight Society 73rd Annual Forum & Technology Display. The Vertical Flight Society, 2017. http://dx.doi.org/10.4050/f-0073-2017-12281.

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Based on mechanism analyses on aeroacoustic characteristics of iced rotors, a new icing detection method is proposed, and a corresponding numerical method for calculating aeroacoustic characteristics of iced rotors is developed. Firstly, the CFD simulation method for 3-D flowfield around the blade is established by solving the unsteady RANS equations. Using the Eulerian approach, the conservation equations of mass and momentum are solved to obtain the droplet flowfield properties. Then, combined with the characters of rotor blade motion, a 3-D icing model considering influences of centrifugal
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Lockard, David, and Jay Casper. "Permeable Surface Corrections for Ffowcs Williams and Hawkings Integrals." In 11th AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-2995.

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Prieur, J., and G. Rahier. "Comparison of Ffowcs Williams-Hawkings and Kirchhoff rotor noise calculations." In 4th AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-2376.

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Ricks, Nathan, Simon Abraham, Francesco Contino, and Ghader Ghorbaniasl. "Sensitivity Analysis and Uncertainty Quantification for the Ffowcs Williams-Hawkings Equation." In 23rd AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-3511.

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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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Lockard, David. "A Comparison of Ffowcs Williams-Hawkings Solvers for Airframe Noise Applications." In 8th AIAA/CEAS Aeroacoustics Conference & Exhibit. American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-2580.

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