A comparison of data reduction techniques for the aeroacoustic analysis of flow over a blunt flat plate

Ph Debesse; L. Pastur; F. Lusseyran; Y. Fraigneau; C. Tenaud; C. Bonamy; A. V.G. Cavalieri; P. Jordan

doi:10.1007/s00162-015-0375-4

A comparison of data reduction techniques for the aeroacoustic analysis of flow over a blunt flat plate

Ph Debesse
, L. Pastur
, F. Lusseyran
, Y. Fraigneau
, C. Tenaud
, C. Bonamy
, A. V.G. Cavalieri
, P. Jordan

INRIA Saclay, Laboratoire de Recherche en Informatique (LRI), Université Paris Sud
CEA/UVSQ/CNRS
Univ. Poitiers
Domaine Universitaire
50

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

A large eddy simulation of flow over a forward-facing plate is performed and the resulting database analyzed with respect to sound radiation. Aeroacoustic analysis motivates an initial data compression comprising eduction of the zeroth-order spanwise Fourier mode. The space–time structure of this component of the flow is then analyzed using POD and DMD in order to probe both the energetics and dynamics of the sound-producing flow skeleton. Both data processing techniques educe flapping and shedding modes and identify a nonlinear interaction between the two. POD shows the flapping mode to be energetically unimportant, while DMD highlights its dynamic importance. The difference mode—vortex shedding modulated by flapping of the separation bubble—is found to be the most acoustically important feature of the flow.

Original language	English
Pages (from-to)	253-274
Number of pages	22
Journal	Theoretical and Computational Fluid Dynamics
Volume	30
Issue number	3
DOIs	https://doi.org/10.1007/s00162-015-0375-4
Publication status	Published - 1 Jun 2016
Externally published	Yes

Keywords

Aeroacoustic
DMD
Flapping
LES
POD
Shedding

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10.1007/s00162-015-0375-4

Cite this

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title = "A comparison of data reduction techniques for the aeroacoustic analysis of flow over a blunt flat plate",

abstract = "A large eddy simulation of flow over a forward-facing plate is performed and the resulting database analyzed with respect to sound radiation. Aeroacoustic analysis motivates an initial data compression comprising eduction of the zeroth-order spanwise Fourier mode. The space{\textendash}time structure of this component of the flow is then analyzed using POD and DMD in order to probe both the energetics and dynamics of the sound-producing flow skeleton. Both data processing techniques educe flapping and shedding modes and identify a nonlinear interaction between the two. POD shows the flapping mode to be energetically unimportant, while DMD highlights its dynamic importance. The difference mode{\textemdash}vortex shedding modulated by flapping of the separation bubble{\textemdash}is found to be the most acoustically important feature of the flow.",

keywords = "Aeroacoustic, DMD, Flapping, LES, POD, Shedding",

author = "Ph Debesse and L. Pastur and F. Lusseyran and Y. Fraigneau and C. Tenaud and C. Bonamy and Cavalieri, \{A. V.G.\} and P. Jordan",

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doi = "10.1007/s00162-015-0375-4",

language = "English",

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T1 - A comparison of data reduction techniques for the aeroacoustic analysis of flow over a blunt flat plate

AU - Debesse, Ph

AU - Pastur, L.

AU - Lusseyran, F.

AU - Fraigneau, Y.

AU - Tenaud, C.

AU - Bonamy, C.

AU - Cavalieri, A. V.G.

AU - Jordan, P.

PY - 2016/6/1

Y1 - 2016/6/1

N2 - A large eddy simulation of flow over a forward-facing plate is performed and the resulting database analyzed with respect to sound radiation. Aeroacoustic analysis motivates an initial data compression comprising eduction of the zeroth-order spanwise Fourier mode. The space–time structure of this component of the flow is then analyzed using POD and DMD in order to probe both the energetics and dynamics of the sound-producing flow skeleton. Both data processing techniques educe flapping and shedding modes and identify a nonlinear interaction between the two. POD shows the flapping mode to be energetically unimportant, while DMD highlights its dynamic importance. The difference mode—vortex shedding modulated by flapping of the separation bubble—is found to be the most acoustically important feature of the flow.

AB - A large eddy simulation of flow over a forward-facing plate is performed and the resulting database analyzed with respect to sound radiation. Aeroacoustic analysis motivates an initial data compression comprising eduction of the zeroth-order spanwise Fourier mode. The space–time structure of this component of the flow is then analyzed using POD and DMD in order to probe both the energetics and dynamics of the sound-producing flow skeleton. Both data processing techniques educe flapping and shedding modes and identify a nonlinear interaction between the two. POD shows the flapping mode to be energetically unimportant, while DMD highlights its dynamic importance. The difference mode—vortex shedding modulated by flapping of the separation bubble—is found to be the most acoustically important feature of the flow.

KW - Aeroacoustic

KW - DMD

KW - Flapping

KW - LES

KW - POD

KW - Shedding

U2 - 10.1007/s00162-015-0375-4

DO - 10.1007/s00162-015-0375-4

M3 - Article

AN - SCOPUS:84950272589

SN - 0935-4964

VL - 30

SP - 253

EP - 274

JO - Theoretical and Computational Fluid Dynamics

JF - Theoretical and Computational Fluid Dynamics

IS - 3

ER -

A comparison of data reduction techniques for the aeroacoustic analysis of flow over a blunt flat plate

Abstract

Keywords

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