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Computational aeroacoustics
Computational aeroacoustics is a branch of aeroacoustics that aims to analyze the generation of noise by turbulent flows through numerical methods.
==History==
The origin of Computational Aeroacoustics can only very likely be dated back to the middle of the 1980s, with a publication of Hardin and Lamkin〔Hardin, J.C. and Lamkin, S. L., "Aeroacoustic Computation of Cylinder Wake Flow," AIAA Journal, 22(1):51-57, 1984〕 who claimed, that
"''() the field of computational fluid mechanics has been advancing rapidly in the past few years and now offers the hope that "computational aeroacoustics," where noise is computed directly from a first principles determination of continuous velocity and vorticity fields, might be possible, ()''"
Later in a publication 1986〔Hardin, J. C. and Lamkin, S. L., "Computational aeroacoustics - Present status and future promise," IN: Aero- and hydro-acoustics; Proceedings of the Symposium, Ecully, France, July 3–6, 1985 (A87-13585 03-71). Berlin and New York, Springer-Verlag, 1986, p. 253-259.〕 the same authors introduced the abbreviation CAA. The term was initially used for a low Mach number approach (Expansion of the acoustic perturbation field about an incompressible flow) as it is described under EIF. Later in the beginning 1990s the growing CAA community picked up the term and extensively used it for any kind of numerical method describing the noise radiation from an aeroacoustic source or the propagation of sound waves in an inhomogeneous flow field. Such numerical methods can be far field integration methods (e.g. FW-H〔Ffowcs Williams, "The Noise from Turbulence Convected at High Speed", ''Philosophical Transactions of the Royal Society'', Vol. A255, 1963, pp. 496-503〕〔Ffowcs Williams, J. E., and Hawkings, D. L., "Sound Generated by Turbulence and Surfaces in Arbitrary Motion", ''Philosophical Transactions of the Royal Society'', Vol. A264, 1969, pp. 321-342〕) as well as direct numerical methods optimized for the solutions (e.g.〔C. K. W. Tam, and J. C. Webb, "Dispersion-Relation-Preserving Finite Difference Schemes for Computational Acoustics", ''Journal of Computational Physics'', Vol. 107, 1993, pp. 262-281〕) of a mathematical model describing the aerodynamic noise generation and/or propagation. With the rapid development of the computational resources this field has undergone spectacular progress during the last three decades.
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