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arXiv 2004.01148physics.flu-dyncs.NAmath.NA
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低压区欧拉方程的孤立波相互作用

Trapped solitary-wave interaction for Euler equations with low pressure region

Marcelo V. Flamarion, Roberto Ribeiro-Jr

摘要:

在全欧拉方程下研究了沿自由面压力分布变化的情况下,孤立波与俘获波的相互作用。将物理域共形地展平成一条带,并在正则域中进行计算。计算机模拟显示孤立波仍然被困在低压区。在约束方面,我们观察到,这些波是稳定的,无论是他们的振幅或压力强迫项的小扰动。此外,多个孤立波被认为是在低压区内没有逃脱的低压区。我们确定制度中,多个孤立波仍然被困在几次碰撞后。特别是,我们展示了一个制度,三个孤立波被困和碰撞几次,在一次逃脱。剩余的孤立波被困在低压区。

英文摘要:

Trapped solitary-wave interaction is studied under the full Euler equations in the presence of a variable pressure distribution along the free surace. The physical domain is flattened conformally onto a strip and the computations are performed in the canonical domain. Computer simulations display solitary waves that remain trapped in a low pressure region. In terms of confinement we observe that these waves are stable for small perturbations of either their amplitudes or the pressure forcing term. Furthermore multiple solitary waves are considered within the low pressure region without escaping the low pressure region. We identify regimes in which multiple solitary waves remain trapped after several collisions. In particular we display a regime where three solitary waves are trapped and collide several times, before one escapes at a time. The remaining solitary waves stays trapped in the low pressure region.

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