Flow structure and dynamics of the flow field over the deck of the ONR Tumblehome geometry are investigated at Reynolds numbers of 32,000, 10~6, and 1.3×10~8 using numerical simulations, dye visualization, and particle image velocimetry. Dominant flow structures are observed at low Reynolds number that are robust at the larger model scale and at full scale Reynolds numbers, providing important insight into understanding the vortex topology and dynamics of the full-scale airwake. Quantitative differences are also observed. Pressure distributions computed on the ship surface are interrogated using proper orthogonal decomposition, and reveal a switch from a symmetric dominant mode at low Reynolds number to an antisymmetric dominant mode at the higher Reynolds number. Some caveats regarding the application of POD are also identified.
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