Large Eddy Simulations (LES) are conducted to study the actuated flow field around a bluff body. The model is a simplified section of a truck. The aim of the work is to model the separation of the flow acting at the front rounded corners, the so called A-pillars, and to minimize the separation of the flow by means of Zero Net Mass Flux synthetic jets. LES data show the interaction of the flow main structures, the separation mechanism and the effects of the actuation on the flow field. The flow is post processed using modal and frequency decompositions. Relevant results in terms of drag reduction were observed for the actuated flow. The principle flow mechanisms are discussed and an optimal actuation frequency, in terms of induced fluctuations and drag reduction, is identified.

中文翻译：

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通用卡车A柱周围主动流控制的数值研究

进行大涡模拟 (LES) 以研究钝体周围的驱动流场。该模型是卡车的简化截面。这项工作的目的是模拟作用在前圆角处的流动分离，即所谓的 A 柱，并通过零净质量通量合成射流最大限度地减少流动分离。LES 数据显示了流动主要结构的相互作用、分离机制以及驱动对流场的影响。使用模态和频率分解对流进行后处理。对于驱动流观察到减阻方面的相关结果。讨论了主要流动机制，并确定了在诱导波动和减阻方面的最佳驱动频率。