The present paper deals with the results of an experimental campaign aimed at characterizing the wall pressure fluctuations (WPF) beneath transitional boundary layer acting along the bulbous bow of a fast ship. The measurements were performed for three different velocities, corresponding to a variation of Reynolds numbers between 9.1 × 105 and 6 × 105. The acquired pressure signals are characterized by the presence of both turbulent bursts, with high frequency fluctuations, and low frequency fluctuations due to instability waves (Tollmien-Schlichting waves) in the laminar portion. The study focuses on three aspects: implementation of a new algorithm to detect turbulent bursts from wall pressure signals, identification of scaling laws for the auto spectral density of WPF in the transition process and characterization of the time-evolution of the their spectral distribution based on Pseudo Wigner Ville distribution.
CITATION STYLE
Magionesi, F. (2016). An experimental study on transitional boundary layer excitation on a bulbous bow of a fast ship. In Lecture Notes in Mechanical Engineering (pp. 367–375). Springer Heidelberg. https://doi.org/10.1007/978-3-662-48868-3_59
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