Numerical Prediction of the Unsteady Flow and Radiated Noise from a 3D Lifting Airfoil PDF Download
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Author: E. Manoha
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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Book Description
The numerical prediction of the aerodynamic noise radiated by an isolated airfoil is performed using a Computational AeroAcoustics (CAA) method. This hybrid method combines (i) a simulation of the near field unsteady flow and (ii) an acoustic method to estimate the noise radiated in the far field. This process is applied to a symmetrical NACA0012 airfoil with a constant section and a blunted trailing edge (TE), at a Mach number of 0.205 and an angle-of-attack of 5%. The Reynolds number based on the airfoil chord is 2%86 millions. The computational domain has a spanwise extent representing 3.3 % of the chord.
Author: E. Manoha
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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Book Description
The numerical prediction of the aerodynamic noise radiated by an isolated airfoil is performed using a Computational AeroAcoustics (CAA) method. This hybrid method combines (i) a simulation of the near field unsteady flow and (ii) an acoustic method to estimate the noise radiated in the far field. This process is applied to a symmetrical NACA0012 airfoil with a constant section and a blunted trailing edge (TE), at a Mach number of 0.205 and an angle-of-attack of 5%. The Reynolds number based on the airfoil chord is 2%86 millions. The computational domain has a spanwise extent representing 3.3 % of the chord.
Author: T. Prabu
Publisher: Springer Nature
ISBN: 9811606986
Category : Technology & Engineering
Languages : en
Pages : 901
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Book Description
div="" style="" This book comprises select proceedings of the 46th National Conference on Fluid Mechanics and Fluid Power (FMFP 2019). The contents of this book focus on aerodynamics and flow control, computational fluid dynamics, fluid structure interaction, noise and aero-acoustics, unsteady and pulsating flows, vortex dynamics, nuclear thermal hydraulics, heat transfer in nanofluids, etc. This book serves as a useful reference beneficial to researchers, academicians and students interested in the broad field of mechanics. ^
Author: American Institute of Aeronautics and Astronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 990
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 490
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 720
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Book Description
Author: Clinton Groth
Publisher: Springer Science & Business Media
ISBN: 3540318011
Category : Technology & Engineering
Languages : en
Pages : 853
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Book Description
Those interested in state of the art in computational fluid dynamics will find this publication a valuable source of reference. The contributions are drawn from The International Conference on Computational Fluid Dynamics (ICCFD) held in 2004. The conference is staged every two years and brings together physicists, mathematicians and engineers who review and share recent advances in mathematical and computational techniques for modeling fluid dynamics.
Author: Douglas Richard Neal
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 422
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Book Description
Author: William Roberto Wolf
Publisher: Stanford University
ISBN:
Category :
Languages : en
Pages : 238
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Book Description
The development of physics-based noise prediction tools for analysis of aerodynamic noise sources is of paramount importance since noise regulations have become more stringent. Direct simulation of aerodynamic noise remains prohibitively expensive for engineering problems because of the resolution requirements. Therefore, hybrid approaches that consist of predicting nearfield flow quantities by a suitable CFD simulation and farfield sound radiation by aeroacoustic integral methods are more attractive. In this work, we apply the fast multipole method (FMM) to accelerate the solution of boundary integral equation methods such as the boundary element method (BEM) and the Ffowcs Williams & Hawkings (FWH) acoustic analogy formulation. The FMM-BEM is implemented for the solution of acoustic scattering problems and the effects of non-uniform potential flows on acoustic scattering are investigated. The FMM-FWH is implemented for the solution of two and three-dimensional problems of sound propagation. The effects of flow convection and non-linear quadrupole sources are assessed through the study of sound generated by unsteady laminar flows. Finally, a hybrid methodology is applied for the investigation of airfoil noise. This study is important for the design of aerodynamic shapes such as wings and high-lift devices, as well as wind turbine blades, fans and propellers. The present investigation of airfoil self-noise generation and propagation concerns the broadband noise that arises from the interaction of turbulent boundary layers with the airfoil trailing edge and tonal noise that arises from vortex shedding generated by laminar boundary layers. Nearfield acoustic sources are computed using compressible large eddy simulation (LES) and acoustic predictions are performed by the FMM-FWH. Numerical simulations are conducted for a NACA0012 airfoil with tripped boundary layers and blunt rounded trailing edge at different Mach numbers and angles of incidence. The effects of non-linear quadrupole sources and convection are assessed. In order to validate the numerical solutions, flow simulation and acoustic prediction results are compared to experimental data available in the literature and excellent agreement is observed.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Book Description
Author: Shia-Hui Peng
Publisher: Springer Science & Business Media
ISBN: 3642141684
Category : Technology & Engineering
Languages : en
Pages : 361
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Book Description
Hybrid modelling of turbulent flows, combining RANS and LES techniques, has received increasing attention over the past decade to fill the gap between (U)RANS and LES computations in aerodynamic applications at industrially relevant Reynolds numbers. With the advantage of hybrid RANS-LES modelling approaches, being considerably more computationally efficient than full LES and more accurate than (U)RANS, particularly for unsteady aerodynamic flows, has motivated numerous research and development activities. These activities have been increasingly stimulated by the provision of modern computing facilities. The present book contains the contributions presented at the Third Symposium on Hybrid RANS-LES Methods, held in Gdansk, Poland, 10-12 June 2009. To a certain extent, this conference was a continuation of the first symposium taking place in Stockholm (Sweden, 2005) and the second in Corfu (Greece, 2007). Motivated by the extensive interest in the research community, the papers presented at the Corfu symposium were published by Springer in the book entitled “Advances in Hybrid RANS-LES Modelling” (in Notes on Numerical Fluid Mechanics and Multidisciplinary Design, Vol. 97). At the Gdansk symposium, along with four invited keynotes, given respectively by S. Fu, U. Michel, M. Sillen and P. Spalart, another 28 papers were presented on the following topics: Unsteady RANS, LES, Improved DES Methods, Hybrid RANS-LES Methods, DES versus URANS and other Hybrid Methods, Modelli- related Numerical Issues and Industrial Applications. After the symposium all full papers have been further reviewed and revised for publication in the present book.
