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arXiv 0710.2634nlin.PS
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活塞色散shock wave问题

The piston dispersive shock wave problem

M. A. Hoefer, M. J. Ablowitz, P. Engels

摘要:

一维活塞激波问题是激波理论的经典结果。本文分析了由非线性薛定谔方程描述的色散流体的类似色散激波问题。渐近解的计算使用Whitham平均理论的“活塞”(步势)匀速移动到一个分散的流体在休息。这些渐近结果同意定量与数值模拟。结果表明,这些解决方案的行为是相当不同的,从他们的经典同行。特别地,冲击结构取决于活塞的速度。这些结果对玻色-爱因斯坦凝聚体和光在非线性散焦介质中的传播有直接的应用。

英文摘要:

The one-dimensional piston shock problem is a classical result of shock wave theory. In this work, the analogous dispersive shock wave (DSW) problem for a dispersive fluid described by the nonlinear Schrödinger equation is analyzed. Asymptotic solutions are calculated using Whitham averaging theory for a "piston" (step potential) moving with uniform speed into a dispersive fluid at rest. These asymptotic results agree quantitatively with numerical simulations. It is shown that the behavior of these solutions is quite different from their classical counterparts. In particular, the shock structure depends on the speed of the piston. These results have direct application to Bose-Einstein condensates and the propagation of light through a nonlinear, defocusing medium.

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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