NDLI: Relation Between Disturbance of Boundary Layer and Free Stream Turbulence Component

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Norimatsu, Ryohei Takai, Shogo Matsubara, Masaharu
Copyright Year	2011
Abstract	In a flat plate boundary layer subjected to isotropic free stream turbulence of few percents turbulence intensity, the streaks, which longitudinally elongated regions of high and low streamwise velocity, appear in the boundary layer and then break down to turbulent spots. Experiments and DNS have revealed that the profile of the streamwise fluctuation energy has a peak at the middle of boundary layer and that the disturbance grows in proportion to the streamwise distance from the leading edge. These results were in good agreement with the non-modal theory. Though the theory suggested that in lower free stream turbulent case modal disturbance has chance to develop and breakdown to turbulence, experimental investigations have not clarified the maximum intensity of the free stream turbulence at which the modal disturbance triggers transition. It is know that there are other processes of the boundary transition that start with a short streak breakdown. In this study various types of the free stream turbulence including anisotropic turbulence are scrutinized using turbulence grids and their relation to the disturbance growth in the boundary layer is investigated. The result with hot-wire measurements shows that the spanwise spectra of the free stream turbulence are essential factor for the non-modal growth. This would be a major step for developing prediction method of boundary layer transition.
Sponsorship	Fluids Engineering Division
Starting Page	2987
Ending Page	2992
Page Count	6
File Format	PDF
ISBN	9780791844403
DOI	10.1115/AJK2011-16030
Volume Number	ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D
Conference Proceedings	ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
Language	English
Publisher Date	2011-07-24
Publisher Place	Hamamatsu, Japan
Access Restriction	Subscribed
Subject Keyword	Turbulence Flat plates Spectra (spectroscopy) Wire Anisotropy Boundary layers
Content Type	Text
Resource Type	Article

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