理論応用力学講演会 講演論文集
第64回理論応用力学講演会
セッションID: OS4-01-04
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OS4-1 大気・海洋・惑星の流体力学(1)
有限幅の内部重力波の安定性
中村 祐輔片岡 武
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Internal gravity waves propagate in a form of ‘beam’ from a wave source in the atmosphere and the ocean. The corresponding solution is an exact solution of the Euler equations. In the present study, we consider ‘3-wave interaction’ of these beams. The 3-wave interaction among monochromatic waves is well-known to occur, but their dynamics among wave beams has not been elucidated so far. According to recent studies, occurrence of instability due to 3-wave interaction among wave beams depends not only on their amplitudes but also on their ‘width’. We demonstrate this fact by numerical simulation of the Euler equations.

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