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Broadband Slat Noise Prediction Based on CAA and Stochastic Sound Sources from a Fast Random Particle-Mesh (RPM) Method

Ewert, Roland (2006) Broadband Slat Noise Prediction Based on CAA and Stochastic Sound Sources from a Fast Random Particle-Mesh (RPM) Method. Computers & Fluids (37), pp. 369-387. Elsevier Science.

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Official URL: http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235694%232008%23999629995%23679579%23FLA%23&_cdi=5694&_pubType=J&_auth=y&_acct=C000007338&_version=1&_urlVersion=0&_userid=100058&md5=33a8dacad5e6f3b22eff23f2f7d0837f

Abstract

The present paper studies the application of a low-cost CAA approach to a slat noise problem. A new fast and cheap stochastic approach is introduced to model the unsteady turbulent sound sources in the slat-cove of a high-lift airfoil. It is based on the spatial convolution of white-noise with a filter kernel and is capable to reproduce target distributions of turbulent kinetic energy and length scales, e.g., provided by a steady RANS solution to the turbulent flow problem. The computational method yields a perfectly solenoidal velocity field that resolves for homogeneous isotropic turbulence exactly the complete second-order two-point velocity correlation tensor. Results for the sound generation at the slat are given for the underlying RANS mean-flow field being based on a Menter SST turbulence model with and without Kato-Launder modification, respectively. Physical meaningful results are obtained for the acoustic characteristics of the slat-noise problem.

Item URL in elib:https://elib.dlr.de/45113/
Document Type:Article
Title:Broadband Slat Noise Prediction Based on CAA and Stochastic Sound Sources from a Fast Random Particle-Mesh (RPM) Method
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ewert, RolandUNSPECIFIEDUNSPECIFIED
Date:2006
Journal or Publication Title:Computers & Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Page Range:pp. 369-387
Publisher:Elsevier Science
Status:Published
Keywords:Aeroacoustics, Turbulent Sound Sources, Particle-Mesh method, Homogeneous Isotropic Turbulence
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Ewert, Dr.-Ing. Roland
Deposited On:15 Dec 2008
Last Modified:14 Jan 2010 23:36

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