三次元離散うず糸法による層流境界層内のかく乱の成長 : 第2報, 2個の等しい初期かく乱の非線形成長

概要

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As a simple model of the large-scale structure in the laminar boundary layer, the devolopment of multi-disturbances is calculated using a three-dimensional discrete vortex filament method. Two equivalent initial disturbances are applied to the same filament and are stretched by the streamwise velocity. The top regions of the disturbance are deformed by the induced velocity. As a result, the velocity profile of the boundary layer is also deformed as the disturbances develop and the initial disturbances are stretched in the downstream direction. Then the hair-pin-shaped structure deforms and pinches out. A unique vortex loop is created and the sweep structure appears in the vicinity of the wall which does not appear in the case of deformation of a unique disturbance.
1992-08-25