ISSN:
0271-2091
Keywords:
Engineering
;
Engineering General
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The different stages of bursting and evolution of the fluctuation field in a turbulent boundary layer are governed by mechanisms that may be identified as either predominantly linear, i.e. governed by linear interaction with the mean shear flow, or non-linear, i.e. with interaction between the fluctuation components also being important. Wave number-frequency spectra reveal the presence of damped wave modes that may be modelled from the Orr-Sommerfeld equation. Conditional sampled experimental data for streamwise velocity fluctuations in the wall layer obtained using the variable interval time averaging (VITA) method scale with the threshold level in a manner consistent with linearity. High-amplitude wall pressure peaks show an approximately linear relationship with the associated vertical velocity fluctuations. Non-linearity acts primarily in the near-wall region where the fluctuation velocity is relatively the highest.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/fld.1650081006
