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- W2023331396 abstract "A theory of three-dimensional incompressible flow separation is presented in terms of the on-wall signatures of the flow. Some long-standing controversial issues are revisited and answers given, such as the inconsistency of the separation criteria based on the topological theory and “open separation,” and whether a separation line is an asymptote or envelope of neighboring skin-friction lines. General criteria for identifying an “open” or “closed” flow separation zone and separation line (including the initial point of the latter), steady and unsteady, are obtained, which apply to a generic smooth curved wall at any Reynolds numbers. The criteria are found to be most clearly given in terms of on-wall signatures of vorticity dynamics. These are then specified to steady boundary layer separation at large Reynolds numbers. A scale analysis under mild assumptions leads to a three-dimensional triple-deck structure near a generic boundary layer separation line. Criteria are presented for “separation watch,” which tells that a boundary-layer may soon break away, and for “separation warning,” which identifies the vorticity characteristics in an already formed boundary-layer separation zone and along a boundary-layer separation line. Flow behavior and its dependence on outer flow conditions are examined qualitatively. A numerical example is given which confirms the predictions of the theory." @default.
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- W2023331396 date "2000-08-01" @default.
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- W2023331396 title "A vorticity dynamics theory of three-dimensional flow separation" @default.
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- W2023331396 doi "https://doi.org/10.1063/1.870442" @default.
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