Abstract
The buffer layer of an internal flow manipulated by riblets is investigated. The distributions of the ejection and bursting frequency from the beginning to the middle part of the buffer layer, together with high moments of the fluctuating streamwise velocity, u’, and its time derivative are reported. The profiles of the ejection and bursting frequency are determined and compared using three single point detection schemes. The effect of the riblets on the bursting mechanism is found confined in a localized region in the buffer layer. The multiple ejection bursts are more affected than the single ejection bursts. The skewness and flatness factors of the u’ signal are larger in the manipulated layer than in the standard boundary layer. That, also holds true for the flatness factor of the time derivative, but the Taylor and Liepman scales are not affected. The spectrum of the u’ signal is altered at the beginning part of the viscous sublayer.
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Tardu, S., Truong, T.V., Tanguay, B. (1993). Bursting and structure of the turbulence in an internal flow manipulated by riblets. In: Prasad, K.K. (eds) Further Developments in Turbulence Management. Fluid Mechanics and its Applications, vol 19. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1701-2_1
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DOI: https://doi.org/10.1007/978-94-011-1701-2_1
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