A Computational Study on Flow Separation Control of Humpback Whale Inspired Sinusoidal Hydrofoils
A Computational Study on Flow Separation Control of Humpback Whale Inspired Sinusoidal Hydrofoils
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发表时间：
2016-01
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通讯作者：
J. Joy;T. New;I. Ibrahim
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作者：
J. Joy;T. New;I. Ibrahim
对NACA 634 -021仿生翼型在不同攻角和雷诺数下的流动控制特性进行了数值研究。利用ANSYS FLUENT软件，基于雷诺平均Navier-Stokes（RANS）求解器模式，结合k-ω剪切应力输运（SST）湍流模型，对该流场进行了数值模拟。结果表明，在整个翼型跨度上，沿着波峰和波谷的流动现象是变化的。与没有前缘突起的基准翼型相比，前缘改进翼型倾向于减小沿峰区沿着的流动分离程度。与此相反，有增加的流动分离在槽区的水翼与前缘突起。有趣的是，观察到不同的流动分离行为产生沿着不同的峰或谷平面沿着的水翼跨度，即使槽或峰是物理上相似的，在每个间隔为一个特定的水翼。还观察到由前缘突起产生的相邻流动结构之间的显著相互作用。这些流动相互作用被认为是造成沿沿着物理上相似的峰面或谷面的不同流动分离行为的原因。
A computational study on bio-inspired NACA634-021 hydrofoils with leading-edge protuberances has been carried out to investigate their hydrodynamic flow control characteristics at a Reynolds number of 14,000 and different angles-of-attack. The numerical simulations were performed using ANSYS FLUENT and based on Reynolds-Averaged Navier-Stokes (RANS) solver mode incorporated with k-ω Shear Stress Transport (SST) turbulence model. The results obtained indicate varying flow phenomenon along the peaks and troughs over the span of the hydrofoils. Compared to the baseline hydrofoil with no leading-edge protuberances, the leading-edge modified hydrofoils tend to reduce flow separation extents along the peak regions. In contrast, there are increased flow separations in the trough regions of the hydrofoil with leading-edge protuberances. Interestingly, it was observed that dissimilar flow separation behaviour is produced along different peak- or trough-planes along the hydrofoil span, even though the troughs or peaks are physically similar at each interval for a particular hydrofoil. Significant interactions between adjacent flow structures produced by the leading-edge protuberances have also been observed. These flow interactions are believed to be responsible for the dissimilar flow separation behaviour along physically similar peak- or trough-planes.