Response maxima in modulated turbulence
作者： Anna von der Heydt , Siegfried Grossmann , Detlef Lohse
DOI: 10.1103/PHYSREVE.67.046308
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摘要: Isotropic and homogeneous turbulence driven by an energy input modulated in time is studied within a variable range mean-field theory. The response of the system, observed second-order moment large-scale velocity difference D(L,t)=《(u(x+L)-u(x))2》∝Re2(t), calculated for varying modulation frequencies ω weak amplitudes. For low system follows driving with almost constant amplitude, whereas higher amplitude decreases on average ∝1/ω. In addition, at certain either vanishes or strongly enhanced. These are connected frequency scale cascade multiples thereof.
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