Estimating of higher order velocity moments and their derivatives in boundary layer by Smoke Image Velocimetry

Abstract

© Published under licence by IOP Publishing Ltd. The results of an experimental evaluation of the third-order moments profiles of velocity fluctuations and their partial derivatives in a zero pressure-gradient turbulent boundary layer are presented. Profiles of characteristics are estimated on the basis of the dynamics of two-component instantaneous velocity vector fields measured by the optical method Smoke Image Velocimetry (SIV). Comparison SIV-measurements with the results of measurements by a thermoanemometer and DNS data with similar Re θ and Re τ showed good agreement between the profiles of < u ′2 v ′ > + , < u ′ v ′2 > + , ∂ < u ′2 v ′ > + /∂y + ∂ < u ′ v ′2 > + /∂y + obtained by SIV and DNS.