CAREER: Unsteady inertial dynamics of suspensions: transport, assembly and propulsion

职业：悬架的不稳定惯性动力学：运输、组装和推进

• 批准号: 2143943
• 负责人: Bhargav Rallabandi
• 金额: $ 54.13万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-03-01 至 2027-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2143943&HistoricalAwards=false
• 关键词: CAREER; Unsteady; inertial; dynamics; suspensions

Controlling the movement of microscopic particles suspended in a liquid is important in a variety of technical applications, including the manipulation of cells in medical and analytical devices, the assembly of particles into structures and specialized materials, and the development of self-propelled particles. This CAREER award will support development of new simulation methods to predict and control particle motion that is driven by rapid oscillations of the suspension. The project will simulate individual particles, pairs of particles and, ultimately, assemblies of particles, taking into account the way interactions among the particles influence their motion. An array of educational activities aimed at K-12, undergraduate and graduate students, especially those from underrepresented groups, will be integrated into the project. Demonstrations of principles encountered in the research will be disseminated to the public through the Ameal Moore Nature Center, and high-school students will participate through hands-on projects that are integrated into training modules for teachers.The goal of this CAREER project is to develop a fundamental understanding of transport, assembly and propulsion in time-periodically driven particulate suspensions. This will be achieved using asymptotic theory, particle-dynamics simulations, and laboratory experiments. The investigators will first develop a nonlinear theoretical framework for particulate suspension dynamics under oscillatory flow, by invoking the separation between fast and slow timescales, and accounting for visco-inertial hydrodynamic interactions. Laboratory experiments will study how vibrated suspensions assemble into planar and three-dimensional structures under confinement. The assembly dynamics and the resulting structures will be interpreted using particle simulations. Finally, the researchers will use theoretical and computational techniques to investigate the role of inertia in self-propulsion, where oscillatory flow is excited by undulations of the body of the swimmer. Thus, the project will identify and quantify the mechanisms controlling the flow of passive and active particulate suspensions under oscillatory excitation. The fundamental scientific advances of the project and its potential applications are expected to inspire new control strategies for particle assembly and prompt further research on inertial particulate flows.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.

控制悬浮在液体中的微观颗粒的运动在各种技术应用中是重要的，包括在医疗和分析设备中操纵细胞，将颗粒组装成结构和专用材料，以及开发自推进颗粒。 该CAREER奖项将支持开发新的模拟方法，以预测和控制由悬架快速振荡驱动的粒子运动。 该项目将模拟单个粒子、粒子对，最终模拟粒子集合，同时考虑到粒子之间的相互作用对其运动的影响。 一系列针对K-12、本科生和研究生，特别是来自代表性不足群体的学生的教育活动将被纳入该项目。 在研究中遇到的原理演示将通过Ameal摩尔自然中心向公众传播，高中生将通过实践项目参与，这些项目被纳入教师培训模块。该CAREER项目的目标是发展对时间周期驱动的颗粒悬浮液中的运输，组装和推进的基本理解。这将通过渐近理论、粒子动力学模拟和实验室实验来实现。研究人员将首先通过调用快速和慢速时间尺度之间的分离，并考虑粘惯性流体动力学相互作用，为振荡流下的颗粒悬浮动力学建立一个非线性理论框架。实验室实验将研究如何振动悬浮组装成平面和三维结构下的限制。组装动力学和由此产生的结构将使用粒子模拟来解释。最后，研究人员将使用理论和计算技术来研究惯性在自推进中的作用，其中振荡流是由游泳者身体的波动激发的。因此，该项目将确定和量化的机制控制振动激励下的被动和主动颗粒悬浮液的流动。该项目的基本科学进展及其潜在应用有望激发新的控制策略的粒子组装和推动进一步的研究惯性particulateflow.This奖项反映了NSF的法定使命，并已被认为是值得的支持，通过评估使用基金会的智力价值和更广泛的影响审查标准。