Computational Aeroacoustics based on Lighthill's Acoustic Analogy
摘要：
Aeroacoustics is concerned with sound, generated by turbulent fluid motion or aerodynamic forces interacting with surfaces. Although no complete scientific theory of the generation of noise by aerodynamic flows has been established, most practical aeroacoustic analysis relies upon the so-called Acoustic Analogy, whereby the governing equations of fluid dynamics are rewritten into a wave like equation. The most common and a widely-used formulation is Lighthill's aeroacoustic analogy, which was proposed by James Lighthill in the 1950s, when studying noise, generated by jet engines. Computational Aeroacoustics (CAA) is the application of numerical methods to find approximate solutions of the governing equations for specific aeroacoustic problems. Most of the proposed methods numerically solved on high performance computers (HPC), are employed in a hybrid two-step approach. The first step consists in computing the turbulent flow field from which the acoustic source terms are evaluated. Subsequently the acoustic radiation is computed. Therewith, no feedback from the acoustic field to the turbulent flow is considered.
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DOI：
10.1007/978-3-540-77448-8_5
被引量：
年份：
2008
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