arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1004.0370nlin.PSphysics.flu-dyn
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浅水中的马赫反射和KP孤子

Mach reflection and KP solitons in shallow water

Harry Yeh, Wenwen Li, Yuji Kodama

摘要:

本文研究了斜入射孤立波在垂直壁面上的反射问题。我们使用Kadomtsev-Petviashivili(KP)方程来分析演化及其渐近状态。使用激光诱导荧光(LIF)技术进行实验室实验,并测量在壁的详细功能和放大。在准二维和弱非线性的假设下,将实验结果与理论结果进行比较,我们发现必须对KP解作出适当的物理解释。由于缺乏对理论的物理解释,以前认为数值结果与理论不一致。通过适当的处理,KP理论提供了一个很好的模型来预测目前的实验室结果以及以前的数值结果。该理论还指出,目前的实验室设备必须太短,以实现渐近状态。实验室和数值计算结果表明,预测的四倍放大的最大值将很难在真实流体环境中实现。这种放大的现实仍然模糊不清。

英文摘要:

Reflection of an obliquely incident solitary wave onto a vertical wall is studied analytically and experimentally. We use the Kadomtsev-Petviashivili (KP) equation to analyze the evolution and its asymptotic state. Laboratory experiments are performed using the laser induced fluorescent (LIF) technique, and detailed features and amplifications at the wall are measured. We find that proper physical interpretation must be made for the KP solutions when the experimental results are compared with the theory under the assumptions of quasi-two dimensionality and weak nonlinearity. Due to the lack of physical interpretation of the theory, the numerical results were previously thought not in good agreement with the theory. With proper treatment, the KP theory provides an excellent model to predict the present laboratory results as well as the previous numerical results. The theory also indicates that the present laboratory apparatus must be too short to achieve the asymptotic state. The laboratory and numerical results suggest that the maximum of the predicted four-fold amplification would be difficult to be realized in the real-fluid environment. The reality of this amplification remains obscure.

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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