Fig. 8.
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Geometrical argument used to identify the modes, kmode, that can be excited by a single scale of turbulence, k0. The integrand in Eq. (19) peaks at k′ such that both |k′ + kmode/2| and |k′ − kmode/2| are equal to k0. The driving can therefore only be efficient if the two black circles in the figure intersect, i.e. if kmode < 2k0.
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