球面浅水系における渦流からの重力波放射について(大気・海洋・惑星の流れ(4),一般講演)

概要

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Spontaneous gravity wave radiation from vortical flows is investigated numerically in a shallow water system on a rotating sphere. We use the spectral-like three point combined compact difference (sp-CCD) scheme in order to estimate gravity wave amplitude with high accuracy. We consider development of a barotropically unstable jet flow with zonal relaxation forcing. Then spontaneous gravity wave radiation is generated continuously from unsteady vortical flows. The latitudinal dependencies of the jets on spontaneous gravity wave radiation are investigated. Using the analogy with the theory of the aero-acoustic sound wave radiation (Lighthill theory), we discuss the conditions of gravity wave radiation and propagation. We also discuss results with the basis of f-plane shallow water system which we studied previously.
日本流体力学会の論文
2007-08-06