MacNeill Megan S, Barkdoll Brian D
Civil, Environmental, and Geospatial Engineering Department, Michigan Technological University, Houghton, MI 49931, USA.
Biomimetics (Basel). 2025 Apr 9;10(4):234. doi: 10.3390/biomimetics10040234.
Wave surfing is a multi-billion dollar industry involving both maneuverability and speed, yet little research has been performed regarding the highest lift-to-drag-ratio fin shape for these competing qualities. Numerical modeling and laboratory experiments were performed here to identify a bio-inspired fin shape that maximized lateral stability and minimized drag forces, in order to increase surfing maneuverability. Nine fins based on dorsal fins of real fish were tested. Both the CFD and laboratory experiments confirmed that the fin of the same shape as that of the Short-Finned Pilot Whale at an angle of attack of 10° had the greatest lift-to-drag ratios. Flow patterns around fins at a low angle of attack were smooth with negligible flow separation, while at any angle of attack greater than 25°, flow-separation-induced drag forces became excessive.
冲浪运动是一个价值数十亿美元的产业，涉及机动性和速度，但对于这些相互竞争的特性而言，关于具有最高升阻比的鳍形状的研究却很少。在此进行了数值建模和实验室实验，以确定一种受生物启发的鳍形状，该形状能使横向稳定性最大化并使阻力最小化，从而提高冲浪机动性。对基于真实鱼类背鳍的九种鳍进行了测试。计算流体动力学（CFD）和实验室实验均证实，在攻角为10°时，与短鳍领航鲸形状相同的鳍具有最大的升阻比。在小攻角下鳍周围的流动模式是平滑的，流动分离可忽略不计，而在任何大于25°的攻角下，流动分离引起的阻力会变得过大。
