空間的に発達する乱流混合層のLarge Eddy Simulation : 周期的じょう乱の影響

概要

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The aim of this study is to clarify the effect of periodic excitation on the development and structure of a turbulent mixing layer. To achieve this purpose, we simulated the spatially developing turbulent mixing layer by using a large eddy simulation. The frequencies of the excitation were 0, 30, 40, and 50Hz. From these calculations, the growth rate of the momentum thickness, fluctuating velocity intensities, isovortical contours, isobaric contours and the trace of the minimum pressure points were clarified. From these results, the following conclusions were obtained. 1) In the early stage of the mixing layer, the higher the excitation frequency becomes, the faster the momentum thickness develops. 2) In the early stage, the bigger the amplitude of the flap becomes, the faster the momentum thickness develops. 3) In the later stage, the growth rate is suppressed by the periodic excitation.
一般社団法人日本機械学会の論文
1991-10-25