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Drag-model sensitivity of Kelvin-Helmholtz waves in canopy flows

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Figure

FIG. 1. Configuration studied with main notations.
FIG. 2. Left frame: mean flow U , together with experimental data points, 15 its first derivative, and drag coe fficient distribution (case G)
FIG. 3. Moduli of direct (left frame) and adjoint (right frame) eigenfunctions for the viscous (continuous lines, Re = 3450) and the inviscid (symbols) case, in correspondence to the wavenumber of largest amplification.
FIG. 4. Real and imaginary parts of the sensitivities to mean flow variations (top) and to variations in the drag distribution function (bottom), for the parameters of Fig
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