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.

预计到2050年，世界人口预计将达到100亿，预示着一个越来越紧张的资源时代，包括蛋白质以养活世界。与传统牲畜相比，鱼类所需的资源要少得多，它是一种可行的蛋白质选择，可以从野生或耕种中收获，这是一种称为水产养殖的过程。截至2019年，加拿大水产养殖的总生产价值每年超过1.2B，该行业雇用了10,000多名员工，未来预计会增长。随着该行业的扩展，了解鱼类集体对导航，喂养和社会互动的反应以发展更有效和人道的实践和设施的刺激的相互关系至关重要。拟议的研究计划的长期目标是开发潜水器的执行器，而不是通过战略性地操纵当地流动环境来引起游泳鱼类所需的行为反应。为此，五年的研究计划沿两个主题进行，首次集中于增强合成射流执行器的推力，第二个是在模型游泳者之间建模水动力相互作用的第二个主题。主题1旨在利用最近发现的“涡流喷嘴”效果，其中，可以通过将其通过适当尺寸的孔径传递，从而被动地增强涡流环的脉冲（动量）。假设涡流喷嘴可用于增强合成喷气机的推力（从孔口弹出的涡流环），而无需增加功率输入。因此，我们旨在探索提高合成喷气执行器效率以将来纳入工程水产养殖系统的可能性。 主题2基于最近的努力，将游泳鱼类作为涡旋偶极子，以探索动物与其环境之间的相互作用。这些模型已被用来考虑动物对游泳构型的稳定性，并揭示了一种纯流体动力学机制，流通通道中的单个鱼可以自身向上游游泳（称为rheotaxis）。该主题的初步焦点是使用通道中起伏的箔的原理数值模拟验证涡流偶极模型，然后使用模拟结合了涡流唤醒的效果，涡流唤醒的效果，这是当前模型中明显缺少的特征。将探索Vortex Wake对动物对稳定游泳配置的影响，将探索在通道中的单只鱼的变性以及在流道中多种鱼类游泳的行为。接受该计划培训的学生将拥有一系列在工程和生物学方面的独特和互补技能，他们准备加入从水产养殖到健康科学再到国防的一系列关键加拿大行业。