CAREER: Computer Simulations of Glassy and Athermal Systems

这一职业奖支持对颗粒材料的基础计算和理论研究，并将新的教育方法注入耶鲁大学的教学中。研究部分侧重于加深对非热和玻璃颗粒系统的了解，如颗粒材料、泡沫、胶体和玻璃，在堵塞开始之前。随着密度、温度或外加应力的调节，这些系统可能会从流动状态转变为类固体状态，这往往是不可预测的。这些系统是非平衡的，因此用于研究平衡热系统的强大工具并不普遍适用。PI将使用计算机模拟技术来解决三个重要问题：(1)干扰起始点的分布如何取决于多分散性、颗粒形状和外加应力？(2)什么物理机制引起空间不均匀的流动轮廓？(3)从涨落-耗散关系定义的广义温度是否可以用来描述稳定剪切的无热系统？对这些问题的回答将有助于发展对干扰附近材料的理论描述。教育部分为耶鲁大学的教育基础设施做出了贡献。PI的目标是开发用于小组学习体验的课程材料，并将其纳入ME课程。PI计划通过设计新的数值方法和模拟技术课程，在现有课程中增加计算模块，以及建立计算和模拟实验室，增加学生提高计算和数值技能的机会。该协会还将为附近中学和大学的学生和教职员工提供教育和研究机会，包括举办研究开放日，就他的研究发表公开演讲，以及参加大学和招聘会。国际学生联合会打算从代表性不足的群体中积极和亲自招收学生。通过指导耶鲁大学明星项目的学生，他在这方面取得了进展。这个职业奖支持颗粒材料的基础计算和理论研究，并将新的教育方法注入耶鲁大学的教学中。随着密度、温度或外加应力的调整，颗粒状材料，如沙子，可能会经历一种奇怪的变化，通常是不可预测的，从流动到类似固体的“堵塞”状态。这项建议的研究部分侧重于在堵塞转变开始之前，对颗粒材料、泡沫、胶体和玻璃有更深入的了解。PI将使用计算机模拟技术来解决该领域中的重要概念性问题，这将有助于开发近干扰材料的理论描述。教育部分为耶鲁大学的教育基础设施做出了贡献。PI将开发小组学习体验的课程材料，并将其纳入ME课程。PI将通过设计新的数值方法和模拟技术课程、在现有课程中增加计算模块，以及建立计算和模拟实验室，增加学生提高计算和数值技能的机会。该协会还将为附近中学和大学的学生和教职员工提供教育和研究机会，包括举办研究开放日，就他的研究发表公开演讲，以及参加大学和招聘会。国际学生联合会打算从代表性不足的群体中积极和亲自招收学生。通过指导耶鲁大学明星项目的学生，他在这方面取得了进展。***

This CAREER award supports fundamental computational and theoretical research on granular materials and the infusion of new educational methods in teaching at Yale. The research component focuses on developing a deeper understanding of athermal and glassy particulate systems, such as granular materials, foams, colloids, and glasses, near the onset of jamming. As density, temperature, or applied stress are tuned, these systems can transform, often unpredictably, from flowing to 'jammed' solid-like states. These systems are out-of-equilibrium, and so the powerful tools used to study equilibrium thermal systems do not generally apply. The PI will use computer simulation techniques to address three important questions: (1) How does the distribution of jamming onsets depend on polydispersity, particle shape, and applied stress? (2) What physical mechanisms give rise to spatially inhomogeneous flow profiles? (3) Can a generalized temperature defined from fluctuation-dissipation relations be used to describe steadily sheared athermal systems? The answers to these questions will contribute to the development of a theoretical description of materials near jamming. The education component contributes to the education infrastructure at Yale. The PI aims to develop course materials for group learning experiences that will be incorporated into the ME curriculum. The PI plans to increase opportunities for students to improve their computational and numerical skills by designing new courses in numerical methods and simulation techniques, adding computational modules to existing courses, and setting-up a Computation and Simulation Laboratory. The PI will also provide educational and research opportunities for students and faculty at nearby secondary schools and universities by hosting research open houses, giving public lectures on his research, and participating in college and career fairs. The PI intends to actively and personally recruit students from underrepresented groups. He has made progress in this area by mentoring students from the STARS program at Yale. %%%This CAREER award supports fundamental computational and theoretical research on granular materials and the infusion of new educational methods in teaching at Yale. As density, temperature, or applied stress are tuned, granular materials, like sand, can undergo a curious transformation, often unpredictably, from flowing to 'jammed' states that are solid-like. The research component of this proposal focuses on developing a deeper understanding of granular materials, foams, colloids, and glasses, near the onset of the jamming transformation. The PI will use computer simulation techniques to address important conceptual questions in the field will contribute to developing a theoretical description of materials near jamming. The education component contributes to the education infrastructure at Yale. The PI will develop course materials for group learning experiences that will be incorporated into the ME curriculum. The PI will increase opportunities for students to improve their computational and numerical skills by designing new courses in numerical methods and simulation techniques, adding computational modules to existing courses, and setting-up a Computation and Simulation Laboratory. The PI will also provide educational and research opportunities for students and faculty at nearby secondary schools and universities by hosting research open houses, giving public lectures on his research, and participating in college and career fairs. The PI intends to actively and personally recruit students from underrepresented groups. He has made progress in this area by mentoring students from the STARS program at Yale. ***