Hydrodynamic Interactions in Vortex Dominated Flows in the Vicinity of Walls

壁附近涡流主导流中的水动力相互作用

• 批准号: RGPIN-2022-03330
• 负责人: Peterson, Sean
• 金额: $ 2.84万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=760441
• 关键词: Hydrodynamic; Interactions; Vortex; Dominated; Flows

The world population is expected to reach 10 billion by 2050, heralding an era of increasingly strained resources, including protein to feed the world. Fish, which require far fewer resources to grow than traditional livestock, are a viable protein option that can be harvested from the wild or farmed, a process referred to as aquaculture. As of 2019, the total value of production of aquaculture in Canada is over $1.2B annually and the industry employs over 10,000 people, with growth expected in the future. As this industry expands it becomes critically important to understand the interrelation of stimuli to which fish collectively respond for navigation, feeding, and social interaction to develop more efficient and humane practices and facilities. The long-term goal of the proposed research program is to develop submersible actuators than elicit desired behavioural responses in swimming fish by strategically manipulating the local flow environment. To this end, the five-year research plan proceeds along two themes, with the first focused on thrust enhancement of synthetic jet actuators, and the second on modeling hydrodynamic interactions between model swimmers. Theme 1 looks to exploit the recently discovered "vortex nozzle" effect, wherein the impulse (momentum) of a vortex ring can be passively enhanced by passing it through an appropriately sized aperture. It is hypothesized that the vortex nozzle can be used to enhance the thrust of a synthetic jet (a train of vortex rings ejected from an orifice) without any increase in power input. Thus, we aim to explore the possibility of improving synthetic jet actuator efficiency for future incorporation into engineered aquaculture systems. Theme 2 builds upon recent efforts to model swimming fish as vortex dipoles to explore interactions between animals and their environment. These models have been used to consider the stability of swimming configurations for animal pairs, and to uncover a purely hydrodynamic mechanism by which a single fish in a flow channel can orient itself to swim upstream (called rheotaxis). The preliminary focus of this theme is validating the vortex dipole model using principled numerical simulations of an undulating foil in a channel, then using the simulations to incorporate the effects of a vortex wake, a feature conspicuously missing from current models. The impact of the vortex wake on stable swimming configurations for animal pairs, rheotaxis of a single fish in channel, and the behavior of multiple fish swimming in a flow channel will be explored. Students trained by this program will be armed with a set of unique and complementary skills in engineering and biology that prepares them to join a range of critical Canadian industries, from aquaculture to health science to national defense.

到 2050 年，世界人口预计将达到 100 亿，这预示着一个资源日益紧张的时代，其中包括养活世界的蛋白质。鱼类的生长所需资源比传统牲畜少得多，是一种可行的蛋白质选择，可以从野生或养殖中收获，这一过程称为水产养殖。截至2019年，加拿大水产养殖总产值每年超过$1.2B，该行业雇用员工超过10,000人，预计未来还会增长。随着该行业的发展，了解鱼类对导航、进食和社会互动做出集体反应的刺激之间的相互关系变得至关重要，以开发更高效和人性化的实践和设施。拟议研究计划的长期目标是开发潜水执行器，通过策略性地操纵局部流动环境来引发游动鱼类所需的行为反应。为此，五年研究计划围绕两个主题进行，第一个主题侧重于合成喷射执行器的推力增强，第二个主题是对模型游泳者之间的流体动力相互作用进行建模。主题 1 着眼于利用最近发现的“涡流喷嘴”效应，其中涡流环的冲量（动量）可以通过使其穿过适当尺寸的孔径来被动增强。据推测，涡流喷嘴可用于增强合成射流（从孔口喷出的一串涡环）的推力，而无需增加功率输入。因此，我们的目标是探索提高合成射流执行器效率的可能性，以便将来纳入工程水产养殖系统。 主题 2 基于最近将游泳鱼类建模为涡旋偶极子的努力，以探索动物与其环境之间的相互作用。这些模型已用于考虑动物对游泳形态的稳定性，并揭示了一种纯粹的流体动力学机制，通过该机制，流道中的单条鱼可以定向向上游游动（称为趋变性）。该主题的初步重点是使用通道中波动箔的原理性数值模拟来验证涡旋偶极子模型，然后使用模拟来合并涡流尾流的影响，这是当前模型中明显缺少的功能。将探讨涡流尾迹对动物对稳定游泳形态的影响、通道中单条鱼的趋动性以及流道中多条鱼游泳的行为。接受该计划培训的学生将掌握一套独特且互补的工程和生物学技能，为他们加入从水产养殖到健康科学到国防等一系列加拿大关键行业做好准备。