壁面の局所的振動が流れのはく離に及ぼす影響

概要

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The laminar flows through a two-dimensional channel constructed of a fixed stenosis and a oscillating wall were calculated numerically in order to evaluate the effect of locally oscillating wall on the structure of separation bubble. In this study, the moving boundary problem was transformed into the fixed boundary problem using the coordinate transformation method. The calculated results are summarized as follows : (1) The local oscillation of wall has an effect to decrease the length of separation bubble. This effect becomes clear with the increase in the amplitude of wall oscillation. (2) Time averaged pressure drop of the flow through a channel is hardly affected by the local oscillation of wall. (3) The time course of the pressure difference across the oscillating region is strongly affected by the time course of the wall height even if the amplitude of wall oscillation is much smaller than the width of channel.
1998-03-25