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Tuning of turbulent boundary layer anisotropy for improved surface pressure and trailing-edge noise modeling

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Authors:
  • Bertagnolio, Franck ;
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    Orcid logo0000-0001-9271-709X
    Department of Wind Energy, Technical University of Denmark
  • Fischer, Andreas ;
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    Department of Wind Energy, Technical University of Denmark
  • Zhu, Wei Jun
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    Fluid Mechanics, Department of Wind Energy, Technical University of Denmark
DOI:
10.1016/j.jsv.2013.10.008
Abstract:
The modeling of the surface pressure spectrum beneath a turbulent boundary layer is investigated, focusing on the case of airfoil flows and associated trailing edge noise prediction using the so-called TNO model. This type of flow is characterized by the presence of an adverse pressure gradient along the airfoil chord. It is shown that discrepancies between measurements and results from the TNO model increase as the pressure gradient increases. The original model is modified by introducing anisotropy in the definition of the turbulent vertical velocity spectrum across the boundary layer and by considering a frequency-dependent vertical correlation length. The degree of anisotropy is directly related to the strength of the pressure gradient. It is shown that by appropriately normalizing the pressure gradient and by tuning the degree of anisotropy, experimental results can be closely reproduced by the modified model. The model is validated against Large Eddy Simulation results and additional wind tunnel measurements. It is further validated in the context of trailing edge noise for which the model formulation makes use of the above surface pressure spectrum.
Type:
Journal article
Language:
English
Published in:
Journal of Sound and Vibration, 2014, Vol 333, Issue 3, p. 991-1010
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2014
Scientific Level:
Scientific
ID:
255580722

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