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arXiv 1105.1920nlin.PSphysics.flu-dyn
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色散shock waves的折射

Refraction of dispersive shock waves

G. A. El, V. V. Khodorovskii, A. M. Leszczyszyn

摘要:

我们研究了经典气体动力学问题中激波与反向传播的简单稀疏波相互作用的色散对应物,通常称为激波折射。在离焦非线性薛定谔(NLS)方程的框架下,研究了一维色散激波(DSW)与中心稀疏波(RW)迎面碰撞时的折射问题。对于可积立方非线性的情况下,我们提出了一个完整的渐近描述DSW折射构造适当的精确解的Whitham调制方程的黎曼不变量。对于具有饱和非线性项的NLS方程,其调制系统不具有Riemann不变量,我们利用最近发展起来的不可积色散系统DSW描述方法,得到DSW折射的主要物理参数。我们的调制理论分析预测的DSW-RW相互作用的主要特点证实了直接数值解的全色散问题。

英文摘要:

We study a dispersive counterpart of the classical gas dynamics problem of the interaction of a shock wave with a counter-propagating simple rarefaction wave often referred to as the shock wave refraction. The refraction of a one-dimensional dispersive shock wave (DSW) due to its head-on collision with the centred rarefaction wave (RW) is considered in the framework of defocusing nonlinear Schrödinger (NLS) equation. For the integrable cubic nonlinearity case we present a full asymptotic description of the DSW refraction by constructing appropriate exact solutions of the Whitham modulation equations in Riemann invariants. For the NLS equation with saturable nonlinearity, whose modulation system does not possess Riemann invariants, we take advantage of the recently developed method for the DSW description in non-integrable dispersive systems to obtain main physical parameters of the DSW refraction. The key features of the DSW-RW interaction predicted by our modulation theory analysis are confirmed by direct numerical solutions of the full dispersive problem.

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