Experimental Observation of Modulational Instability in Crossing Surface Gravity Wavetrains

James Steer, Mark McAllister, Alistair Borthwick, Ton van den Bremer

Research output: Contribution to journalArticlepeer-review

Abstract

The coupled nonlinear Schrödinger equation (CNLSE) is a wave envelope evolution equation applicable to two crossing, narrow-banded wave systems. Modulational instability, a feature of the nonlinear Schrödinger wave equation, is characterized (to first order) by an exponential growth of sideband components and the formation of distinct wave pulses, often containing extreme waves. Linear stability analysis of the CNLSE shows the effect of crossing angle, θ, on MI, and reveals instabilities between 0◦ < θ < 35◦, 46◦ < θ < 143◦, and 145◦ < θ < 180◦. Herein, the modulational stability of crossing wavetrains seeded with symmetrical sidebands is determined experimentally from tests in a circular wave basin. Experiments were carried out at 12 crossing angles between 0◦ < θ < 88◦, and strong unidirectional sideband growth was observed. This growth reduced significantly at angles beyond θ ≈ 20◦, reaching complete stability at θ = 30 − 40◦. We find satisfactory agreement between numerical predictions (using a time-marching CNLSE solver) and experimental measurements for all crossing angles.
Original languageEnglish
JournalFluids
Early online date4 Jun 2019
DOIs
Publication statusE-pub ahead of print - 4 Jun 2019

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