Experimental Observation of Modulational Instability in Crossing Surface Gravity Wavetrains

Fluids

卷:4

TonS. van den Bremer¹  MarkL. McAllister¹  AlistairG. L. Borthwick²  JamesN. Steer² 

[1] Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK;

[2] School of Engineering, The University of Edinburgh, King’s Buildings, Edinburgh EH9 3DW, UK;

关键词: surface waves;    crossing seas;    modulational/Benjamin-Feir instability;    coupled nonlinear Schrödinger equation (CNLSE);    experiments;   

DOI  :  10.3390/fluids4020105

来源: DOAJ

【 摘 要 】

The coupled nonlinear Schrödinger equation (CNLSE) is a wave envelope evolution equation applicable to two crossing, narrow-banded wave systems. Modulational instability (MI), 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, $\theta$ , on MI, and reveals instabilities between $0^{\circ }<\theta <{35}^{\circ }$ , ${46}^{\circ }<\theta <{143}^{\circ }$ , and ${145}^{\circ }<\theta <{180}^{\circ }$ . 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 $0^{\circ }\le \theta \le {88}^{\circ }$ , and strong unidirectional sideband growth was observed. This growth reduced significantly at angles beyond $\theta \approx {20}^{\circ }$ , reaching complete stability at $\theta$ = 30−40 ${}^{\circ }$ . We find satisfactory agreement between numerical predictions (using a time-marching CNLSE solver) and experimental measurements for all crossing angles.

【 授权许可】

Unknown