Mechanical Engineering - Research Publications

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    Reproducing AS/NZS terrain-type wind profiles in a short-fetch wind-tunnel
    Kevin, K ; Philip, J ; Monty, J ; Klewicki, J (AWES, 2018)
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    Turbulent flow above wind-generated waves: conditional statistics and POD structures
    Kevin, K ; Philip, J ; Lee, JH ; Bhirawa, T ; Monty, J (Australian Fluid Mechanics Society, 2018)
    Large field-of-view particle image velocimetry (PIV) measurement is performed to characterise the turbulent boundary layer above evolving wind waves, which are developed over 3.5 m fetch at U∞ = 8.2 m/s. This multi-camera experiment captures a streamwise domain of 0.4 m, slightly longer than two dominant wavelength of these wind waves. Instantaneous velocity observations reveal strong flow separations on the leeward side of most dominant waves, and these events are also marked by strong vertical velocity fluctuations. The spatially-averaged velocity profile further indicates a large velocity gradient below the wave crest, which occupies a significant proportion of the boundary layer. The conditionally-averaged flow fields around larger dominant waves show that turbulence stresses are high downwind the wave crest, indicating the highly varying form of the separation events. These events are further elucidated using proper orthogonal decomposition (POD) analysis, where the first few stronger modes reveal several common attributes around the separation events.