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- W2013419073 abstract "Linear and nonlinear initial-value problems are discussed for planar inviscid disturbances in streamlined near-wakes. This is mostly for those areas of near-wake flow where the basic motion comprises nearly uniform shear with or without normal influx into the accompanying viscous interfacial layer, although agreement is found with linear properties for full velocity profiles of double-Blasius, double-Jobe–Burggraf, Hakkinen–Rott and Goldstein form. With nonlinear disturbances, wavelike initial conditions yield a known critical-layer development, whereas more general, non-wave, initial conditions lead to a new integro-partial-differential amplitude equation which is studied analytically and numerically. The solutions show decay, finite-time blowup or nonlinear upstream-travelling disturbances. The normal influx proves crucial. Absolute and upstream- or downstream-convective instability is encountered (depending on the profiles, and flow reversal, for example); and in generic cases (for any thin airfoil) nonlinearity is shown analytically to provoke upstream convection. Increased nonlinearity drives the typical transition point extremely close to the trailing edge. Comparisons are made with three-dimensional behaviour in the linear case and with a direct simulation in the nonlinear regime." @default.
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- W2013419073 date "2000-03-01" @default.
- W2013419073 modified "2023-09-27" @default.
- W2013419073 title "Nonlinear effects in absolute and convective instabilities of a near-wake" @default.
- W2013419073 doi "https://doi.org/10.1016/s0997-7546(90)00107-j" @default.
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