Download e-book for iPad: Advances in Wave Turbulence by Victor Shrira, Sergei Nazarenko

By Victor Shrira, Sergei Nazarenko

Wave or vulnerable turbulence is a department of technology taken with the evolution of random wave fields of every kind and on all scales, from waves in galaxies to capillary waves on water floor, from waves in nonlinear optics to quantum fluids. regardless of the large variety of wave fields in nature, there's a universal conceptual and mathematical middle which permits to explain the techniques of random wave interactions in the similar conceptual paradigm, and within the comparable language. the improvement of this center and its hyperlinks with the functions is the essence of wave turbulence technological know-how (WT) that is a longtime crucial a part of nonlinear technological know-how.

The booklet comprising seven reports goals at discussing new demanding situations in WT and views of its improvement. a distinct emphasis is made upon the hyperlinks among the idea and scan. all of the experiences is dedicated to a selected box of program (there isn't any overlap), or a singular technique or thought. The stories disguise various purposes of WT, together with water waves, optical fibers, WT experiments on a steel plate and observations of astrophysical WT.

Readership: Researchers, pros and graduate scholars in mathematical physics, strength experiences, reliable & fluid mechanics, and intricate platforms.

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Extra resources for Advances in Wave Turbulence

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As pointed out in the previous section, a similar analysis for the kinetic equation dnk /dt = 2 T2 [nk ] dominated by three wave resonances gives two special stationary solutions nk = T /ω and nk = cP 1/2 ω −(γ2 /α+d/α) corresponding to energy equipartition and finite energy flux P . An alternative derivation: For reasons of pedagogy, it is helpful to rederive the stationary solutions T4 [nk ] = 0 in another way. If the coupling coefficient Sωω1 ω2 ω3 is localized and supported only near ω = ω1 = ω2 = ω3 , one can replace S(ω) by a differential representation ∂ 2 K/∂ω 2 where K = S0 ω 3x0 +2 n4 d2 n−1 /dω 2 , S0 is a well-defined integral and x0 = 2γ3 /(3α) + d/α.

2004, 2006) have carried out a series of experiments on the surface response to broad and narrowband forcing at wavenumbers kf < k0 = ρg/S. To increase the range where pure capillary influences are dominant, both groups have sought to decrease viscosity and the effective gravity. The Paris group used shallow layers of mercury (λ0 = 2π/k0 ∼ 1 cm) and layers of ethanol and water in very low gravity situations (kudos to their courage in flying loop the loops) where λ0 ∼ 10 cm. The forcing in both the cases was sinusoidal (via subharmonic generation) and low pass filtered, broadband and random in the 0 to 6 Hz range.

In that experiment, an envelope pulse centered on a carrier frequency ω close to ω12 = (E1 − E2 )/ is propagated into a predominantly two energy (E1 , E2 ) level medium. The medium is called inhomogeneously broadened because of a random mismatch ω − ω12 of the input and medium frequencies induced by Doppler shifts of the thermally excited atoms. Some parts of the initial field behave as wavetrains made incoherent by interactions with the random medium. Because of their random phases, these parts are trapped (cf.

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