## Large-Eddy Simulation for AcousticsClaus Wagner, Thomas Hüttl, Pierre Sagaut Noise pollution around airports, trains, and industries increasingly attracts environmental concern and regulation. Designers and researchers have intensified the use of large-eddy simulation (LES) for noise reduced industrial design and acoustical research. This 2007 book, written by 30 experts, presents the theoretical background of acoustics and of LES, followed by details about numerical methods, e.g. discretization schemes, boundary conditions, coupling aspects. Industrially relevant, hybrid RANS/LES techniques for acoustic source predictions are presented in detail. Many applications are featured ranging from simple geometries for mixing layers and jet flows to complex wing and car geometries. Selected applications include scientific investigations at industrial and university research institutions. |

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### Contents

22 | |

24 | |

Figure 22 Sketch of scattered plane wave with mean ﬂow | 54 |

Figure 24 Straight duct of arbitrary cross section | 68 |

Figure 29 Acoustic ﬂow at a pipe outlet a for | 87 |

LargeEddy Simulation | 89 |

Figure 31 Schematic kinetic energy spectra | 95 |

Figure 34 Schematic of the twolevel ﬁltering procedure and the | 122 |

Use of Hybrid RANSLES for Acoustic | 128 |

Figure 411 Instantaneous Schlierenlike view Taken from | 160 |

Figure 56 Von Karman vortex street past an inclined wing | 205 |

Simulation | 206 |

o | 207 |

Figure 514 Transfer function F as a function of | 235 |

6 | 238 |

Conclusions | 378 |

### Other editions - View all

Large-Eddy Simulation for Acoustics Claus Wagner,Thomas Hüttl,Pierre Sagaut No preview available - 2012 |

Large-Eddy Simulation for Acoustics Claus Wagner,Thomas Hüttl,Pierre Sagaut No preview available - 2007 |

### Common terms and phrases

acoustic analogy acoustic field acoustic waves aeroacoustics aerodynamic airfoil amplitude applied approach approximation Bailly Bogey boundary conditions boundary layer calculations cavity coefficients compact schemes component compressible compressible flows computational aeroacoustics convection corresponds CUFX063/Wagner derived direction discretization dissipation downstream duct eddy viscosity effects errors Euler equations far-field Ffowcs ﬁeld Figure filter ﬁltering ﬁrst ﬂuctuations fluid flux formulation Fourier frequency Green's function grid hybrid RANS-LES inﬂow inlet integral jet noise kinetic energy large-eddy simulations Lele length scale levels Lighthill's linear Mach number mean ﬂow mesh mixing layer modes Navier-Stokes equations near-wall noise sources nonlinear NUMERICAL METHODS obtained perturbations pipe plane prediction pressure problem propagation radiation RANS region resolution resolved Reynolds number Sagaut Section shear layer sheridan November 17 solution sound sources source term spanwise spatial spectra streamwise structures subgrid model subgrid-scale subsonic surface tensor turbulent unsteady upwind variables velocity vortex vorticity wall wave equation wave number