Whisker-like geometries and their force reduction properties
Whisker-like geometries and their force reduction properties
复制标题
晶须状几何形状及其减力特性
DOI：
10.1109/oceans-bergen.2013.6608113
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
M. Triantafyllou
中科院分区：
文献类型：
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作者：
H. Hans;J. Miao;G. Weymouth;M. Triantafyllou
本文研究了港海豹须的几何特征对其减力能力的影响。密封须状物中的每个特征从原始须状物形状顺序地剥离。四个须状的几何形状创建从这样的方法。对结构周围的流动进行3D模拟，并且对结构上的合力进行无量纲化。这些结构的升力和阻力系数进行比较的真实的晶须的情况。短轴和长轴上的起伏被认为是必要的，在减少升力。只有一个波动的存在不能削弱流动和破坏尾流中的涡管和涡辫。发现前缘和后缘之间的偏移角对升力和阻力系数的影响很小。阻力系数的降低被发现是依赖于在短轴上的起伏的存在。在其一个轴上具有起伏的须状几何形状的力响应被发现是周期性的。当两个起伏的胡须状几何形状的力响应被发现是混沌的。涡脱落频率的结构被观察到显着降低时，没有偏移角被引入到几何形状。这可以导致结构的更长寿命。
This paper studies the effects of geometrical features on harbor seal whiskers on its force reduction ability. Each feature in the seal whisker is sequentially stripped from the original whisker shape. Four whisker-like geometries are created from such methodology. 3D simulations of flow around the structures are performed and the resulting forces on the structures are non-dimensionalized. The lift and drag coefficients of these structures are compared to the real whisker case. The undulations on minor and major axes are found to be necessary in reducing the lift forces. Existence of only one of the undulations fails to weaken the flow and break the vortex tubes and braids in the wake. The offset angle between leading edge and trailing edge are found to have slight effects on the lift and drag coefficients. The reduction in drag coefficient is found to be dependent on the existence of undulations in minor axis. The force responses of whisker-like geometries with undulations on one of their axes are found to be periodic. When the force response on whisker-like geometries with both undulations are found to be chaotic. Vortex shedding frequency of the structure is observed to decrease considerably when no offset angle is introduced into the geometry. This may result in longer lifespan of the structure.