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arXiv 1902.08013physics.flu-dynnlin.CD
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表面波turbulence的能量级联:识别有源波耦合

The energy cascade of surface wave turbulence: toward identifying the active wave coupling

Antoine Campagne, Roumaissa Hassaini, Ivan Redor, Joel Sommeria, Nicolas Mordant

摘要:

我们调查实验湍流的表面重力波在格勒诺布尔的科里奥利设施使用高灵敏度本地探头和时间和空间分辨的立体重建的水面。研究表明,水的变形是由遵循线性色散关系的弱非线性波和非共振三元相互作用产生的束缚波叠加而成。虽然理论预测了一个4波共振耦合支持波作用的逆级联的存在,我们没有观察到这样的逆级联。我们通过计算三相干即四波相关来研究四波耦合。我们观察到非常弱的值的三相干激发的线性色散关系的弱耦合的弱湍流理论的假设是一致的频率。

英文摘要:

We investigate experimentally turbulence of surface gravity waves in the Coriolis facility in Grenoble by using both high sensitivity local probes and a time and space resolved stereoscopic reconstruction of the water surface. We show that the water deformation is made of the superposition of weakly nonlinear waves following the linear dispersion relation and of bound waves resulting from non resonant triadic interaction. Although the theory predicts a 4-wave resonant coupling supporting the presence of an inverse cascade of wave action, we do not observe such inverse cascade. We investigate 4-wave coupling by computing the tricoherence i.e. 4-wave correlations. We observed very weak values of the tricoherence at the frequencies excited on the linear dispersion relation that are consistent with the hypothesis of weak coupling underlying the weak turbulence theory.

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