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# Kinematic and Acoustic Similarities of Separated Turbulent Boundary Layers

Suryadi, Alexandre (2018) Kinematic and Acoustic Similarities of Separated Turbulent Boundary Layers. 2018 AIAA/CEAS Aeroacoustics Conference, 25-29 June 2018, Atlanta, Georgia. United States of America. DOI: 10.2514/MAA18

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Official URL: http://dx.doi.org/10.2514/6.2018-3937

## Abstract

A similarity model for separated turbulent boundary layer is proposed as a function of the velocity associated with the maximum local mean shear $U_m = \tau_m /\rho$. A linear relation between mean velocity and reduced wall-normal coordinate is observed for approximately 40–50% of the boundary layer height. A corresponding similarity model of the far-field sound pressure levels was also derived. The proposed scaling law shows less variability than the classical trailing-edge noise scaling within a range of the freestream velocity and airfoil’s angle of attack. In comparison to classical trailing-edge noise, the sound pressure level scaling of separated flow is tuned by a factor of $U_m^2$, a non-dimensional velocity variable associated with the maximum mean shear stress in the separated boundary layer.

Item URL in elib:https://elib.dlr.de/122939/
Document Type:Conference or Workshop Item (Speech)
Title:Kinematic and Acoustic Similarities of Separated Turbulent Boundary Layers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Date:2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/MAA18
Status:Published
Keywords:flow separation, self-similar model
Event Title:2018 AIAA/CEAS Aeroacoustics Conference
Event Location:Atlanta, Georgia. United States of America
Event Type:international Conference
Event Dates:25-29 June 2018
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Suryadi, Alexandre
Deposited On:10 Dec 2018 16:34