Numerical simulations of the eddies generated by a large mountain

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Other Title
  • 大規模山岳における低気圧性渦の剥離

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Abstract

We investigated the mechanisms of the generation and drift of this cyclonic eddies by numerical simulation with a largemountain in a rotating flow using three-dimensional non-hydrostatic primitive model. Drifting cyclonic eddy formed fromnear the mountain and was advected to leeward by the large-scale flow. This drifting cyclonic eddy was known to a kind ofthe gravity wave for its phase speed, and the initial formation mechanism of this drifting eddy was known to be stretchingcaused by the advection of warmer air to downslope of the mountain. However, the dependence for the vorticity intensity onthe main wind speed seems to be odd, so the thermal advection on the crest of a mountain for the vorticity intensity maydepend on the main wind speed.To investigate thermodynamic effect more exactly, sinusoidally wind RUN was executed for many event of the cycloniceddy generation. The stretching mechanism from a thermal advection is one of main factors to generate a cyclone, but is notall. So, Other mechanism seems to be important to investigate the drifting cyclonic eddy generation mechanism.

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Details 詳細情報について

  • CRID
    1050564285647166080
  • NII Book ID
    AN00027784
  • ISSN
    0386412X
  • HANDLE
    2433/129148
  • Text Lang
    ja
  • Article Type
    departmental bulletin paper
  • Data Source
    • IRDB

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