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arXiv 1702.02683nlin.PSphysics.flu-dyn
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非均匀参量激励下的定域法拉第斑图

Localized Faraday patterns under heterogeneous parametric excitation

Héctor Urra, Juan F. Marín, Milena Páez-Silva, Majid Taki, Saliya Coulibaly, Leonardo Gordillo, Mónica A. García-Ñustes

摘要:

法拉第波是一个经典的例子,在一个系统中,一个扩展的模式出现在空间均匀的迫使。受系统中的均匀激发是不合理的,我们研究了实验和理论上的法拉第波的非均匀强迫的效果。我们的实验表明,限制在有限区域的振动导致形成本地化的次谐波图案和改变的发病不稳定性。用于理论计算的原型模型是参数驱动和阻尼的非线性薛定谔方程,这是已知的描述法拉第不稳定性制度。对于高斯空间分布的能量注入,我们表明,波图案的包络的演变可以减少到一个韦伯方程的本征值问题。我们的理论结果提供了很好的预测,我们的实验观察提供的衰减长度尺度的高斯分布是远远大于图案波长。

英文摘要:

Faraday waves are a classic example of a system in which an extended pattern emerges under spatially uniform forcing. Motivated by systems in which uniform excitation is not plausible, we study both experimentally and theoretically the effect of heterogeneous forcing on Faraday waves. Our experiments show that vibrations restricted to finite regions lead to the formation of localized subharmonic wave patterns and change the onset of the instability. The prototype model used for the theoretical calculations is the parametrically driven and damped nonlinear Schrödinger equation, which is known to describe well Faraday-instability regimes. For an energy injection with a Gaussian spatial profile, we show that the evolution of the envelope of the wave pattern can be reduced to a Weber-equation eigenvalue problem. Our theoretical results provide very good predictions of our experimental observations provided that the decay length scale of the Gaussian profile is much larger than the pattern wavelength.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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