Author: R. J. AstleyPublisher:
ISBN:
Category :
Languages : en
Pages : 89
Book Description
Special Section: Computational Aero-acoustics (CAA) for Aircraft Noise Prediction
Computational Aero-acoustics (CAA) for Aircraft Noise
Author: Computational Aeroacoustics
Author: Jay C. HardinPublisher: Springer Science & Business Media
ISBN: 1461383420
Category : Science
Languages : en
Pages : 525
Book Description
Computational aeroacoustics is rapidly emerging as an essential element in the study of aerodynamic sound. As with all emerging technologies, it is paramount that we assess the various opportuni ties and establish achievable goals for this new technology. Essential to this process is the identification and prioritization of fundamental aeroacoustics problems which are amenable to direct numerical siIn ulation. Questions, ranging from the role numerical methods play in the classical theoretical approaches to aeroacoustics, to the correct specification of well-posed numerical problems, need to be answered. These issues provided the impetus for the Workshop on Computa tional Aeroacoustics sponsored by ICASE and the Acoustics Division of NASA LaRC on April 6-9, 1992. The participants of the Work shop were leading aeroacousticians, computational fluid dynamicists and applied mathematicians. The Workshop started with the open ing remarks by M. Y. Hussaini and the welcome address by Kristin Hessenius who introduced the keynote speaker, Sir James Lighthill. The keynote address set the stage for the Workshop. It was both an authoritative and up-to-date discussion of the state-of-the-art in aeroacoustics. The presentations at the Workshop were divided into five sessions - i) Classical Theoretical Approaches (William Zorumski, Chairman), ii) Mathematical Aspects of Acoustics (Rodolfo Rosales, Chairman), iii) Validation Methodology (Allan Pierce, Chairman), iv) Direct Numerical Simulation (Michael Myers, Chairman), and v) Unsteady Compressible Flow Computa tional Methods (Douglas Dwoyer, Chairman).
Special Section
Author: Second Computational Aeroacoustics (CAA) Workshop on Benchmark Problems
Author: C. K. W. TamPublisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 396
Book Description
Computational Aeroacoustics
Author: Christopher K. W. TamPublisher: Cambridge University Press
ISBN: 052180678X
Category : Mathematics
Languages : en
Pages : 497
Book Description
Both a textbook for graduate students with exercises and a reference with code for researchers in computational aeroacoustics (CAA).
ICASE/LaRC Workshop on Benchmark Problems in Computational Aeroacoustics (CAA)
Author: Jay C. HardinPublisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 412
Book Description
IUTAM Symposium on Computational Aero-Acoustics for Aircraft Noise Prediction, Southampton, UK, 29-31 March 2010
Author: R. Jeremy AstleyPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 312
Book Description
IUTAM Symposium on Computational Aero-Acoustics for Aircraft Noise Prediction 2010
Author: Development of Computational Aeroacoustics Code for Jet Noise and Flow Prediction
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781721529681
Category :
Languages : en
Pages : 26
Book Description
Accurate prediction of jet fan and exhaust plume flow and noise generation and propagation is very important in developing advanced aircraft engines that will pass current and future noise regulations. In jet fan flows as well as exhaust plumes, two major sources of noise are present: large-scale, coherent instabilities and small-scale turbulent eddies. In previous work for the NASA Glenn Research Center, three strategies have been explored in an effort to computationally predict the noise radiation from supersonic jet exhaust plumes. In order from the least expensive computationally to the most expensive computationally, these are: 1) Linearized Euler equations (LEE). 2) Very Large Eddy Simulations (VLES). 3) Large Eddy Simulations (LES). The first method solves the linearized Euler equations (LEE). These equations are obtained by linearizing about a given mean flow and the neglecting viscous effects. In this way, the noise from large-scale instabilities can be found for a given mean flow. The linearized Euler equations are computationally inexpensive, and have produced good noise results for supersonic jets where the large-scale instability noise dominates, as well as for the tone noise from a jet engine blade row. However, these linear equations do not predict the absolute magnitude of the noise; instead, only the relative magnitude is predicted. Also, the predicted disturbances do not modify the mean flow, removing a physical mechanism by which the amplitude of the disturbance may be controlled. Recent research for isolated airfoils' indicates that this may not affect the solution greatly at low frequencies. The second method addresses some of the concerns raised by the LEE method. In this approach, called Very Large Eddy Simulation (VLES), the unsteady Reynolds averaged Navier-Stokes equations are solved directly using a high-accuracy computational aeroacoustics numerical scheme. With the addition of a two-equation turbulence model and the use of a relatively c