Relevant bibliographies by topics / FW-H equation

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'FW-H equation'

Author: Grafiati
Published: 1 April 2023
Last updated: 31 July 2025

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Journal articles on the topic "FW-H equation"

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Kusyumov, Alexander, Sergey Mikhailov, Sergey Kusyumov, Elena Romanova, and Georgios Barakos. "Some Peculiarities of Helicopter Main Rotor Aeroacoustic for Far-Field Observer." EPJ Web of Conferences 213 (2019): 02048. http://dx.doi.org/10.1051/epjconf/201921302048.

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Mathematical models for helicopter rotor acoustics are usually based on the Ffowcs Williams–Hawkings (FW–H) equation. The level of rotor noise is determined by geometry (thickness noise) of a flying vehicle and distributed blade loading (loading noise). Initially, the FW-H equation was obtained from Euler’s equations and does not depend on the viscosity of flow. In the present work the UH-1H helicopter is considered as a test case for numerical CFD simulation and comparison to experimental data.
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Tao, Jun, Gang Sun, Ying Hu, and Miao Zhang. "Noise Prediction for Multi-Element Airfoil Based on FW-H Equation." Applied Mechanics and Materials 52-54 (March 2011): 1388–93. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.1388.

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In this article, four observation points are selected in the flow field when predicting aerodynamic noise of a multi-element airfoil for both a coarser grid and a finer grid. Numerical simulation of N-S equations is employed to obtain near-field acoustic information, then far-field acoustic information is obtained through acoustic analogy theory combined with FW-H equation. Computation indicates: the codes calculate the flow field in good agreement with the experimental data; The finer the grid is, the more stable the calculated sound pressure level (SPL) is and the more regularly d(SPL)/d(St)
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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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Lyrintzis, Anastasios S. "Surface Integral Methods in Computational Aeroacoustics—From the (CFD) Near-Field to the (Acoustic) Far-Field." International Journal of Aeroacoustics 2, no. 2 (2003): 95–128. http://dx.doi.org/10.1260/147547203322775498.

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A review of recent advances in the use of surface integral methods in Computational AeroAcoustics (CAA) for the extension of near-field CFD results to the acoustic far-field is given. These integral formulations (i.e. Kirchhoff's method, permeable (porous) surface Ffowcs-Williams Hawkings (FW-H) equation) allow the radiating sound to be evaluated based on quantities on an arbitrary control surface if the wave equation is assumed outside. Thus only surface integrals are needed for the calculation of the far-field sound, instead of the volume integrals required by the traditional acoustic analog
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Seol, Hanshin, Cheolsoo Park, and Ki-Sup Kim. "Numerical Prediction of Marine Propeller BPF Noise Using FW-H Equation and Its Experimental Validation." Transactions of the Korean Society for Noise and Vibration Engineering 26, no. 6_spc (2016): 705–13. http://dx.doi.org/10.5050/ksnve.2016.26.6.705.

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Chen, Li, Yang Yu, and Guo Xiang Hou. "Flow-Induced Noise Radiation from the Rotational Bodies Based on Fluid Mechanics Using Hybrid Immersed Boundary Lattice-Boltzmann/FW-H Method." Applied Mechanics and Materials 345 (August 2013): 345–48. http://dx.doi.org/10.4028/www.scientific.net/amm.345.345.

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A novel study of the simulations of the flow-induced noise from the moving boundary objects using the hybrid immersed boundary lattice-Boltzmann method (IB-LBM), which is the modern useful numerical method of fluid mechanics, on the Ffowcs Williams-Hawkings (FW-H) equation is carried out. The permeable surface FW-H method has been demonstrated an effective technique of the far-field noise predication, because of its complete theories and successful applications in aeroacoustics. It usually need the information of the field near sound source. Therefore, we also adopt the effective and widely us
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Guo, H., YS Wang, F. Zhu, NN Liu, and C. Yang. "Multi-field coupling prediction for improving aeroacoustic performance of muffler based on LES and FW-H acoustic analogy methods." International Journal of Aeroacoustics 20, no. 3-4 (2021): 414–36. http://dx.doi.org/10.1177/1475472x211005409.

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Based on the large eddy simulation (LES) and Ffowcs Williams and Hawkings (FW-H) equation, a multi-field coupling method is presented for aeroacoustic prediction of a muffler with high-speed and high-temperature exhaust gasflow. A three-dimensional finite-volume model of the muffler is established by using the LES and FW-H acoustic analogy (FW-H-AA) methods. Experimental validations of the simulated results suggest a good accuracy of the combined LES and FW-H-AA approach. Some factors influencing on noise attenuation, such as the gasflow velocity, temperature and the structural parameters of t
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Li, Zhibin, Wei Sun, Yuni Zhang, Zihan Zhang, and Lusheng Jiang. "Aeroacoustic Analysis of Rotor in Forward Flight Considering Blade Elastic Deformation." Journal of Physics: Conference Series 2890, no. 1 (2024): 012060. http://dx.doi.org/10.1088/1742-6596/2890/1/012060.

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Abstract A rotor aeroacoustic calculation model of the rotor in forward flight based on CAMRAD II and FW-H equation was established, which can involve blade elastic deformation. CAMRAD II was used to calculate the actual motion of the blade and the rotor’s unsteady aerodynamic load based on the elastic blade model. The blade dynamics module in the noise calculation program was replaced to consider the blade elastic deformation in forward flight based on the FW-H equation. The forward flight noise characteristics of a full scale rotor were researched. The research shows that the rotor has obvio
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Khelladi, Sofiane, and Farid Bakir. "A Consistency Test of Thickness and Loading Noise Codes Using Ffowcs Williams and Hawkings Equation." Advances in Acoustics and Vibration 2010 (July 4, 2010): 1–6. http://dx.doi.org/10.1155/2010/174361.

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The thickness noise predicted by the Ffowcs Williams and Hawkings (FW&H) equation depends on the normal velocity which is very sensitive to the meshing size. Isom showed that in far field a monopolar source is equivalent to a dipolar source induced by a uniform distribution of the load on the entire moving surface. The main objective of this paper is to determine a specific expression of Isom's thickness noise in time and frequency domains for subsonic fans. The scope of the proposed expression of Isom's thickness noise is to define a benchmark test of consistency for thickness and loading
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Bozorgi, Alireza, Leonidas Siozos-Rousoulis, Seyyed Ahmad Nourbakhsh, and Ghader Ghorbaniasl. "A two-dimensional solution of the FW-H equation for rectilinear motion of sources." Journal of Sound and Vibration 388 (February 2017): 216–29. http://dx.doi.org/10.1016/j.jsv.2016.10.035.

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Dissertations / Theses on the topic "FW-H equation"

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CIANFERRA, MARTA. "Acoustic Analogies and Large-Eddy Simulations of Incompressible and Cavitating Flows Around Bluff Bodies." Doctoral thesis, Università degli Studi di Trieste, 2018. http://hdl.handle.net/11368/2922550.

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L'attività di ricerca riportata in questa tesi riguarda lo studio numerico della generazione e propagazione del rumore idroacustico. Le onde sonore possono essere emesse ogni volta che esiste un movimento relativo tra due fluidi o tra un fluido e una superficie. Nei decenni passati è stata prestata molta attenzione ai problemi di rumore aeroacustico. Nel corso degli anni, modelli teorici e numerici adatti per flussi transonici o super-sonici sono stati sviluppati e la loro efficacia è stata testata. La principale fonte di rumore è stata identificata nei termini detti di thickness e loading. Pe
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Book chapters on the topic "FW-H equation"

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Zhong, Yan, Jiongmin Yu, Guoping Li, and Yi Zhang. "Study of the Influencing Factors on Underwater Radiated Noise of Fin Stabilizer." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-97-7887-4_97.

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Abstract Ships use anti roll fins to reduce ship roll and enhance passenger comfort. At present, there is a lot of research on the performance improvement and system control of anti roll fins, but less attention has been paid to the water generated noise around anti roll fins. To explore the underwater radiation noise characteristics and propagation laws of anti roll fins, a radiation sound analysis model for anti roll fins was established. Based on the data obtained from unsteady CFD calculations, pressure, velocity, density and other sound source data were extracted, and the FW-H equation wa
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Zhang, Shumin, Jiawei Shi, and Xiaozhen Sheng. "A Method for Predicting the Aerodynamic Pass-By Noise Based on FW-H Equation Without Using Sliding Mesh or Overset Mesh." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-7852-6_22.

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Chen, Qingguang, Qinchang Wang, Xianlai Lin, Haixiu Liu, and Songshou Liu. "The Influence of Guide Vane Blade Distribution on the Performance of Mine Axial Flow Fan." In Advances in Transdisciplinary Engineering. IOS Press, 2024. http://dx.doi.org/10.3233/atde240249.

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The noise generated by fan blades is the main noise source of axial flow fans used in mines. Because of its excessive noise, the need for noise reduction is increasingly urgent. This paper takes a certain type of mine axial fan as the research object, uses Lighthill acoustic analogy theory, FW-H acoustic wave equation and Fluent numerical simulation method to compare the performance of the fan under uniform and non-uniform distribution of the guide vane, and focuses on the influence of the guide vane layout on the aerodynamic performance, flow field characteristics and noise characteristics of
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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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Conference papers on the topic "FW-H equation"

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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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Zhu, Zheng, and Qi-Jun Zhao. "Numerical Analyses for Aerodynamic and Noise Characteristics of Helicopter Scissors Tail Rotor." In Vertical Flight Society 70th Annual Forum & Technology Display. The Vertical Flight Society, 2014. http://dx.doi.org/10.4050/f-0070-2014-9413.

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Numerical analyses for aerodynamic and noise characteristics of helicopter scissors tail rotor both in hover and forward flight are conducted. A solver named CFD/FW-H method which combines the CFD method and FW-H approach is established to predict the noise characteristics of scissors tail rotor. In this solver, based on the moving-embedded grid system, a CFD simulation method for aerodynamic characteristics of scissors tail rotor is developed by solving the unsteady RANS equations with Baldwin-Lomax turbulence model, and the discretization of convective fluxes is completed by ROE-MUSCL scheme
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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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Ianniello, S. "Quadrupole noise predictions through the FW-H equation." In 4th AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-2377.

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Li, Fu, Zhang Yanwu, and Wang Lingling. "Vibration Modelling of Micro Air Vehicle Based on the FW-H Equation." In 2015 Joint International Mechanical, Electronic and Information Technology Conference. Atlantis Press, 2015. http://dx.doi.org/10.2991/jimet-15.2015.224.

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Erwin, James P., and Neeraj Sinha. "Near and Far-Field Investigations of Supersonic Jet Noise Predictions Using a Coupled LES and FW-H Equation Method." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45210.

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The hot supersonic exhausts of gas turbine engines on military aircraft generate dangerously high noise levels. The noise levels associated with operating these engines are harmful to aircraft carrier deck personnel as well as detrimental to ship and aircraft structures. In this paper, the supersonic jet exhaust is simulated using Large Eddy Simulation (LES), and the Ffowcs Williams and Hawkings (FW-H) equation transforms the LES solution to an acoustic solution in the far-field. A Mach 1.5 laboratory jet test at United Technologies Research Center - Acoustics Research Tunnel is used as valida
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Wang, Zeyang, Jun Huang, and Mingxu Yi. "Research on Helicopter Rotor Acoustic Noise Prediction Method Based on Convected FW-H Equation." In 2022 8th Annual International Conference on Network and Information Systems for Computers (ICNISC). IEEE, 2022. http://dx.doi.org/10.1109/icnisc57059.2022.00163.

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Wang, Zhong-Nan, Iftekhar Z. Naqavi, Mahak Mahak, Paul Tucker, Xin Yuan, and Paul Strange. "Far Field Noise Prediction for Subsonic Hot and Cold Jets Using Large-Eddy Simulation." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-27290.

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Large eddy simulations are performed for hot and cold single stream jets with an acoustic Mach number of (Ma = Vj/a∞ = 0.875). The temperature ratio (Tj/T∞) for the hot jet is 2.7 and for the cold jet it is 1.0. Grids with 34 million points are used. The simulation results for the flow field are in encouraging agreement with the mean velocity and Reynolds stress measurements. The Ffowcs Williams-Hawkings (FW-H) equation is used to predict the far-field noise. In this study four cylindrical FW-H surfaces around the jet at various radial distances from the centreline are used. The FW-H surfaces
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Erwin, James P., Neeraj Sinha, and Gregory P. Rodebaugh. "Large Eddy Simulations of Supersonic Impinging Jets." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-70140.

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Supersonic impinging jet flowfields contain self-sustaining acoustic feedback features that create high levels of discrete frequency tonal noise. These types of flowfields are typically found with short takeoff and landing military aircraft as well as jet blast deflector operations on aircraft carrier decks. The US Navy has a goal to reduce the noise generated by these impinging jet configurations and is investing in computational aeroacoustics to aid in the development of noise reduction concepts. In this paper, implicit Large Eddy Simulation (LES) of impinging jet flow-fields are coupled wit
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Caraeni, Mirela, O. Aybay, and S. Holst. "Tandem Cylinder and Idealized Side Mirror Far-Field Noise Predictions Using DES and An Efficient Implementation of FW-H Equation." In 17th AIAA/CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference). American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-2843.

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