Topic
Computational aeroacoustics
About: Computational aeroacoustics is a research topic. Over the lifetime, 1163 publications have been published within this topic receiving 20080 citations.
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TL;DR: Explicit numerical methods for spatial derivation, filtering, and time integration are proposed in this article with the aim of computing flow and noise with high accuracy and fidelity, and they are constructed in the same way by minimizing the dispersion and the dissipation errors in the wavenumber space up to kΔx = π/2 corresponding to four points per wavelength.
883 citations
TL;DR: In this paper, a review of computational methods for computational aero-acoustics applications is presented, and some of the computational methods to be reviewed are quite different from traditional CFD methods.
Abstract: Computational fluid dynamics (CFD) has made tremendous progress especially in aerodynamics and aircraft design over the past 20 years. An obvious question to ask is "why not use CFD methods to solve aeroacoustics problems?" Most aerodynamics problems are time independent, whereas aeroacoustics problems are, by definition, time dependent. The nature, characteristics, and objectives of aeroacoustics problems are also quite different from the commonly encountered CFD problems. There are computational issues that are unique to aeroacoustics. For these reasons computational aeroacoustics requires somewhat independent thinking and development. The objectives of this paper are twofold. First, issues pertinent to aeroacoustics that may or may not be relevant to computational aerodynamics are discussed. The second objective is to review computational methods developed recently that are designed especially for computational aeroacoustics applications. Some of the computational methods to be reviewed are quite different from traditional CFD methods. They should be of interest to the CFD and fluid dynamics communities.
529 citations
TL;DR: A hierarchy of computational approaches that range from semi-empirical schemes that estimate the noise sources using mean-flow and turbulence statistics, to high-fidelity unsteady flow simulations that resolve the sound generation process by direct application of the fundamental conservation principles is discussed in this paper.
520 citations
TL;DR: A critical review of computational techniques for flow-noise prediction and the underlying theories, in which the turbulent noise source field is computed and/or modeled separately from the far-field calculation, is provided.
Abstract: This article provides a critical review of computational techniques for flow-noise prediction and the underlying theories. Hybrid approaches, in which the turbulent noise source field is computed and/or modeled separately from the far-field calculation, are afforded particular attention. Numerical methods and modern flow simulation techniques are discussed in terms of their suitability and accuracy for flow-noise calculations. Other topics highlighted include some important formulation and computational issues in the application of aeroacoustic theories, generalized acoustic analogies with better accounts of flow-sound interaction, and recent computational investigations of noise-control strategies. The review ends with an analysis of major challenges and key areas for improvement in order to advance the state of the art of computational aeroacoustics.
399 citations
TL;DR: In this article, the authors developed strict wall boundary conditions on the basis of the generalized characteristics for computational aeroacoustics (CAA), especially in focus of far-field nonreflecting conditions.
Abstract: A previous paper introduced generalized characteristic boundary conditions for computational aeroacoustics (CAA), especially in focus of far-field nonreflecting conditions. This paper develops strict wall boundary conditions on the basis of the generalized characteristics. True multidimensionality of the characteristic relations is guaranteed in the present work by maintaining entire terms of governing equations, which has been approximated virtually by local one-dimensional inviscid relations during the past two decades. Treating the transverse and viscous terms as source terms in the characteristic relations leads to an exact and simple formalism of wall boundary conditions. Any kind of extrapolation or assumption is not included in the formalism. The proposed inviscid and viscous wall boundary conditions are applied to typical CAA problems for verifying the numerical accuracy in actual implementations. The computations are performed on non-orthogonal grids to exhibit the effect of multidimensionality on the solutions in acoustic fields. It is shown that the present results are in good agreements with analytic estimations and experimental data. This demonstrates the feasibility of the proposed wall boundary conditions for further practical CAA applications.
284 citations