Abstract
AbstractThe 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.
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