成層乱流中の波動モードと渦モードの振舞いについて(流体工学,流体機械)

概要

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Stratified turbulence is analyzed using the rapid distortion theory (RDT) in the Craya-Herring frame, in which the wave components and the vortex components are separated automatically and the difference in the behaviors of two modes is shown more clearly than the previous analysis which utilized the usual Cartesian frame. In this study we have explicitly calculated the time development of the energy partition among the wave, vortex and potential energy components which clearly represents the oscillatory behaviour due to the buoyancy force or the steady behavior unaffected by the buoyancy force. We have verified the equi-partition between the wave component of kinetic energy (E_w) and the potential energy (PE) in the long-time asymptotics, which has been observed in the previous DNS. This occurs quite generally irrespective of the initial conditions such as the isotropy of turbulence or the initial energy partition.
2003-06-25