一般化された2次元流体系における平行流の安定性(大気・海洋・惑星の流れ(4),一般講演)

概要

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Stability and evolution of parallel shear flows for a generalized two-dimensional fluid system, so-called α-turbulence system, are investigated theoretically and numerically. The α-turbulence system includes a parameter α which expresses the scale separation between the velocity and the advected quantity. The dependence of stability of parallel shear flows on α is mainly studied. From linear stability analysis, wavenumber of the fastest growing unstable disturbance and its growth rate increase as α increases, in the case of prescribed basic velocity. Direct numerical simulations of α-turbulence equation support this analysis. Considering that the shear instability is caused by the resonance of neutral Rossby waves, we explain the dependence of the wavenumber of the fastest growing unstable disturbance on α.
日本流体力学会の論文
2007-08-06