CAREER: Multiscale Turbulent Flow Interaction with Flexible Branched Trees for Storm Impact Research

职业：多尺度湍流与柔性分支树的相互作用用于风暴影响研究

基本信息

批准号：
1943810
负责人：
Kourosh Shoele
金额：
$ 50万
依托单位：
Florida State University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-01-01 至 2024-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1943810&HistoricalAwards=false
关键词：
CAREER Multiscale Turbulent Flow Interaction

项目摘要

The goal of this research is to systematically investigate the fluid-structure interactions of a tree canopy and the turbulent flow over the canopy, paving the way to improved predictions of storm severity. The canopy has flexible branched trees that deform and dynamically adapt to unsteady turbulent flow and continuously exchanges air with the atmosphere. There are still significant open questions about the formation of coherent flow structures and their connection to the canopy architecture and tree characteristics. The multiscale interactions between the tree canopy and large-scale turbulent coherent will be studied to fill a critical gap in the current knowledge about turbulent flow over canopies and to identify the processes that control storm severity and are also critical factors in global biogeochemical cycles and climate change. The primary educational objective is to enhance the multidisciplinary education of Mechanical Engineering students and increase the retention rate of minority undergraduate students. Nature-inspired examples and live demonstrations will be used to motivate students to pursue science and engineering disciplines. A tightly integrated outreach program will be developed to increase public knowledge about the fluid dynamics of wind in canopies, its role in storms, and the associated impacts on climate change.The proposed research uses flexible multi-branch trees and a wind tunnel with rotational capabilities to study turbulent flow interactions above flexible tree canopies. Large-eddy simulations and a dynamic multilink model of branched trees from foliage to the trunk will be used to form a multiscale interaction model of the turbulent flow and a fractal tree and to identify the previously unknown physical mechanisms responsible for momentum and energy transfers between atmosphere and tree canopies. The feedback process between wind-induced deflection of a branched tree, aerodynamic damping due to branch oscillation and turbulent unsteady flow will be investigated to explain the process of the canopy breathing during ejection (burst) and sweep (gust) turbulent phases and to find the origin of distinct spatial and temporal transport features during these phases. The results will be used in a predictive linear coupled technique to study progressive deformation waves and flow coherent structures observed in canopies. An expected outcome of this research effort is an explanation for the puzzling observations of canopy flows and improved predictions of turbulent structures in detrimental weather conditions such as wind storms.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项研究的目的是系统地研究树冠的流体结构相互作用和顶篷上的湍流，为改善风暴严重程度的预测铺平了道路。冠层具有柔性的枝棵树，可变形并动态适应不稳定的湍流，并连续将空气与大气交换。关于相干流结构的形成及其与冠层结构和树木特征的联系仍然存在重大的开放问题。将研究树冠与大规模湍流相干之间的多尺度相互作用，以填补有关can层上湍流的当前知识的关键空白，并确定控制风暴严重程度的过程，并且也是全球生物地球化学周期和气候变化的关键因素。主要的教育目标是增强机械工程专业学生的多学科教育，并提高少数族裔本科生的保留率。自然风格的例子和现场演示将用于激励学生追求科学和工程学科。将制定一项紧密融合的外展计划，以提高有关檐篷中风能流体动态的公众知识，其在风暴中的作用以及对气候变化的相关影响。拟议的研究使用柔性的多支离树木和具有旋转能力的风洞来研究柔性树罐头上方的湍流流动相互作用。大涡模拟和从树叶到树干的分支树的动态多链接模型将用于形成湍流和分形树的多尺度相互作用模型，并识别导致大气和树檐篷之间动量和能量转移的先前未知的物理机制。将研究风引起的分支树偏转，由于分支振荡引起的空气动力阻尼和湍流不稳定流量之间的反馈过程，以解释在射血（爆发）和扫描（阵风）湍流过程中的冠层呼吸的过程，并在这些相相期间找到独特的空间和临时运输特征的起源。结果将用于预测线性耦合技术中，以研究檐篷中观察到的渐进变形波和流相干结构。这项研究工作的预期结果是对冠层流的令人困惑的观察以及在有害天气状况（例如风暴）中对动荡结构的预测的解释。这项奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的审查标准来通过评估来通过评估来支持的。

项目成果

期刊论文数量（5）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Hybrid wave/current energy harvesting with a flexible piezoelectric plate

使用柔性压电板进行混合波/电流能量收集

DOI：
10.1017/jfm.2023.583
发表时间：
2023
期刊：
Journal of Fluid Mechanics
影响因子：
3.7
作者：
Shoele, Kourosh
通讯作者：
Shoele, Kourosh

Flapping dynamics of an inverted flag behind a cylinder

圆柱体后面的倒旗的扑动动力学

DOI：
10.1088/1748-3190/ac96b9
发表时间：
2022
期刊：
Bioinspiration & Biomimetics
影响因子：
3.4
作者：
Ojo, Oluwafemi;Kohtanen, Eetu;Jiang, Aojia;Brody, Jacob;Erturk, Alper;Shoele, Kourosh
通讯作者：
Shoele, Kourosh

Aspect ratio-dependent hysteresis response of a heavy inverted flag