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• W2767074518 abstract "There is a long-standing debate in the literature of stratified flows over topography concerning the correct dimensionless number to refer to as a Froude number. Common definitions using external quantities of the flow include $U/(ND)$ , $U/(Nh_{0})$ , and $Uk/N$ , where $U$ and $N$ are, respectively, scales for the background velocity and buoyancy frequency, $D$ is the depth, and $h_{0}$ and $k^{-1}$ are, respectively, height and width scales of the topography. It is also possible to define an internal Froude number $Fr_{unicode[STIX]{x1D6FF}}=u_{0}/sqrt{g^{prime }unicode[STIX]{x1D6FF}}$ , where $u_{0}$ , $g^{prime }$ , and $unicode[STIX]{x1D6FF}$ are, respectively, the characteristic velocity, reduced gravity, and vertical length scale of the perturbation above the topography. For the case of hydrostatic lee waves in a deep ocean, both $U/(ND)$ and $Uk/N$ are insignificantly small, rendering the dimensionless number $Nh_{0}/U$ the only relevant dynamical parameter. However, although it appears to be an inverse Froude number, such an interpretation is incorrect. By non-dimensionalizing the stratified Euler equations describing the flow of an infinitely deep fluid over topography, we show that $Nh_{0}/U$ is in fact the square of the internal Froude number because it can identically be written in terms of the inner variables, $Fr_{unicode[STIX]{x1D6FF}}^{2}=Nh_{0}/U=u_{0}^{2}/(g^{prime }unicode[STIX]{x1D6FF})$ . Our scaling also identifies $Nh_{0}/U$ as the ratio of the vertical velocity scale within the lee wave to the group velocity of the lee wave, which we term the vertical Froude number, $Fr_{vert}=Nh_{0}/U=w_{0}/c_{g}$ . To encapsulate such behaviour, we suggest referring to $Nh_{0}/U$ as the lee-wave Froude number, $Fr_{lee}$ ." @default.
• W2767074518 created "2017-11-10" @default.
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• W2767074518 date "2017-10-20" @default.
• W2767074518 modified "2023-10-10" @default.
• W2767074518 title "An unambiguous definition of the Froude number for lee waves in the deep ocean" @default.
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• W2767074518 doi "https://doi.org/10.1017/jfm.2017.701" @default.
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