F116 海風フロントと混合大気境界層中の熱対流との相互作用に関する数値実験

概要

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A two-dimensional numerical simulation of a sea-breeze front was performed in order to investigate the interaction of a sea-breeze front with Benard-Rayleigh type convective cells within mixed boundary layer ahead. By using nonhydrostatic compressible dry model with high spatial resolution (Δx=50m), we found the fine structure of the front changed during such interaction. During inland penetration of the sea-breeze, frontal structure (vertical velocity, horizontal gradient of temperature, etc.) was varied periodically, as it was affected by the updraft and downdraft flows associated with convective cells within mixed boundary layer. Frontogenesis (FG) and frontolysis (FL) phenomena were repeatedly observed at the foremost part of the sea-breeze. In addition, the discrete propagation of the front was also observed. Using frontogenesis equation, we analyzed the detailed processes of FG and FL phenomena and revealed the physical mechanisms that control the FG and FL phenomena.
日本流体力学会の論文
2000-07-25