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首页> 外文期刊>International Journal of Heat and Fluid Flow >Changes in flat plate wake characteristics obtained with decreasing plate thickness
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Changes in flat plate wake characteristics obtained with decreasing plate thickness

机译：随着板厚的减小而获得的平板唤醒特性的变化

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摘要

The near and very near wake of a flat plate with a circular trailing edge is investigated with data from direct numerical simulations. Computations were performed for four different Reynolds numbers based on plate thickness (D) and at constant plate length. The value of theta/D varies by a factor of approximately 20 in the computations (theta being the boundary layer momentum thickness at the trailing edge). The separating boundary layers are turbulent in all the cases. One objective of the study is to understand the changes in wake characteristics with changing theta/D (as obtained by decreasing D). Vortex shedding is vigorous in the low theta/D cases with a substantial decrease in shedding intensity in the largest theta/D case (for all practical purposes shedding becomes almost intermittent). Other characteristics that are significantly altered with increasing BID are the roll-up of the detached shear layers and the magnitude of fluctuations in shedding period. These effects are explored in depth. The effects of changing BID on the distributions of the time-averaged, near-wake velocity statistics are discussed. Published by Elsevier Inc.
机译：用直接数值模拟的数据研究了具有圆形后缘的平板的近和近尾流。基于板厚（D）和恒定板长对四个不同的雷诺数进行了计算。在计算中，θ/ D的值变化约20倍（θ是后缘的边界层动量厚度）。在所有情况下，分离的边界层都是湍流的。该研究的目的之一是了解随着θ/ D（通过减小D获得）而改变的唤醒特性。在低θ/ D情况下，涡旋脱落非常剧烈，而在最大θ/ D情况下，涡旋脱落强度显着降低（出于所有实际目的，脱落几乎是间歇性的）。随着BID的增加而显着改变的其他特征是，分离的剪切层的卷起和脱落周期的波动幅度。这些效果将进行深入探讨。讨论了更改BID对时间平均的近苏速度统计信息的分布的影响。由Elsevier Inc.发布

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