Force Chain Fluctuations and Jamming in Dense Granular Flows

0908238C。O 'Herbal PI请求NSF-CBET分部颗粒和多相过程计划的国际旅行支持，以支付约20名受邀与会者的旅行相关费用，这些与会者将在第七届EUROMECH固体力学会议的小型研讨会“力链波动和密集颗粒流中的干扰”上介绍他们对密集颗粒材料（DGM）的研究（ESMC 2009）于2009年9月7日至11日在葡萄牙里斯本举行。 小型研讨会由PI和NJIT数学科学系的Lou Kondic教授组织。 在ESMC 2009年的这个小型研讨会将加强物理，数学和工程科学研究人员之间的合作关系，他们研究欧洲和美国的致密颗粒介质。和研究人员，目前DGM研究的首要目标是对给定的结构和力学性能进行定量和预测性描述，制备历史和粒子性质的光谱。 特别是，有一个重大的努力，以了解力链网络的作用，在DGM。 然而，最近在DGM领域的大部分研究都是通过美国和欧洲的物理学家，数学家和工程师的不协调努力进行的。 通过组织这次多学科和多国研讨会，我们寻求汇集最活跃的研究人员，包括实验人员，模拟器和理论家，在DGM领域，允许交流创新思想，促进新的合作，并加强美国和欧洲科学家之间的国际知识转移。 本次小型研讨会有望加快DGM领域研究突破的步伐。需要将数学、物理和工程技术联合收割机相结合的方法来解决DGM领域的下一代问题。 此外，来自美国和欧洲的DGM研究人员之间的互动机会有限。 拟议的小型研讨会的一个重要目标是汇集一个多学科的科学家小组在他们的科学生涯的各个阶段，集思广益，讨论当前在DGM的开放问题。 ESMC 2009的小型研讨会是在参与者之间建立持久联系的第一步。 本次小型研讨会的组织者还将组织后续的国际研讨会和讲习班，重点是DGM，例如，2010年早春将在耶鲁大学举行的“颗粒材料中堵塞和流动的计算同源工具”讲习班。更广泛的影响颗粒材料在流动和堵塞状态之间过渡的制度与许多工业过程非常相关，包括化学工程，制药和石油生产。 一个定量和预测的理解，如何建模粒状材料，因为他们屈服，流动，或响应施加的压力尚未达到。 虽然大量的科学家正在进行DGM的重大研究工作，但研究人员通常不知道在不同学科和不同大陆进行的相关工作。 拟议中的小型研讨会将汇集物理学家，数学家和工程师，以鼓励跨学科和国家的新合作，这将在未来十年内刺激DGM的智力突破。 此外，小型研讨会将允许年轻科学家向国际社会介绍他们的工作，并与DGM领域的领导人进行互动。 许多受邀的演讲者将是NSF-CBET最近的受资助者和代表性不足的群体的研究人员。

0908238C. O'HernThe PI requests support for international travel from NSF-CBET Division, Particulate and Multiphase Processes Program, to cover travel-related expenses for approximately 20 invited participants that will present their research on dense granular materials (DGM) at a mini-symposium "Force chain fluctuations and jamming in dense granular flows" at the 7th EUROMECH Solid Mechanics Conference (ESMC 2009) in Lisbon, Portugal September 7-11, 2009. The mini-symposium is organized by the PI and Prof. Lou Kondic from the Department of Mathematical Sciences at NJIT. This mini-symposium at ESMC 2009 will strengthen collaborative ties between researchers in physics, mathematics, and the engineering sciences who study dense granular media in Europe and the U.S. A large fraction of the invitees will be recent CBET grantees in DGM, junior scientists, and researchers from under-represented groups.Intellectual MeritThe overarching goal of current studies of DGM is to develop a quantitative and predictive description of the structural and mechanical properties given a spectrum of preparation histories and particle properties. In particular, there is a significant effort to understand the role of force chain networks in DGM. However, much of the recent research in the field of DGM has been performed via uncoordinated efforts of physicists, mathematicians, and engineers in the U.S. and Europe. By organizing this multi-disciplinary and multi-national symposium, we seek to bring together the most active researchers, including experimentalists, simulators, and theorists, in the field of DGM to allow the exchange of innovative ideas, the fostering of new collaborations, and the strengthening of international knowledge transfer among scientists in the U.S. and Europe. This mini-symposium promises to increase the pace of research breakthroughs in the filed of DGM.Approaches that combine techniques from mathematics, physics, and engineering are required to solve the next generation of problems in the filed of DGM. In addition, there are only limited opportunities for interaction between researchers in DGM from the U.S. and Europe. An important goal of the proposed mini-symposium is to bring together a multi-disciplinary group of scientists at various stages of their scientific careers to brainstorm and discuss current open questions in DGM. This mini-symposium at ESMC 2009 is the first step in establishing lasting connections between participants. The organizers of this mini-symposium will also organize follow-up international symposia and workshops focusing on DGM, for example the workshop "Computational Homology Tools Applied to Jamming and Flow in Granular Materials" will be held at Yale University in the early spring 2010.Broader ImpactsThe regime where granular materials transition between flowing and jammed states is of great relevance to many industrial processes, including those in chemical engineering, pharmaceuticals, and oil production. A quantitative and predictive understanding of how to model granular materials as they yield, flow, or respond to applied stresses has not yet been reached. While significant research efforts in DGM are being performed by a wide array of scientists, often the researchers are not aware of related work being carried out in different disciplines and on different continents. The proposed mini-symposium will bring together physicists, mathematicians, and engineers to encourage new collaborations across disciplines and nationalities that will stimulate intellectual breakthroughs in DGM in the coming decade. In addition, the mini-symposium will allow junior scientists to present their work to the international community and interact with leaders in the field of DGM. Many of the invited speakers will be recent grantees from NSF-CBET and researchers from under-represented groups.