U.S. participation in the IUTAM Symposium on "Mobile particulate systems: kinematics, rheology and phenomena" Bangalor, India, January 23-27, 2012

这次研讨会是由国际理论和应用力学联合会(IUTAM)主办的，它是IUTAM大会为当前两年期间选出的大约15个国际理论和应用力学联合会之一。本次会议的主题是颗粒流、颗粒-流体悬浮以及柔性和/或游动细胞和微生物的悬浮。虽然已经就个别主题举行了会议和研讨会，但据提出者所知，这是第一次将这些主题结合在一起寻求协同互动，从而推动所有主题领域的会议。颗粒和颗粒-流体流动在自然界和工业过程中普遍存在，但对它们的力学和运动学却知之甚少。这种了解对于设计和优化化工、矿产、食品和制药行业的流程以及减轻雪崩和泥石流等自然灾害的影响将具有重要价值。有几个因素导致对这些系统缺乏了解，例如颗粒相互作用的复杂性质(例如，干燥系统中的摩擦、悬浮液中的流体动力相互作用)、对颗粒相互作用和微观结构的统计数据的有限理解，以及这些性质对强迫性质的强烈依赖。本次会议的重点将是颗粒流动或自由流动的流动状态。为颗粒流和悬浮流开发的数学工具和实验技术在许多复杂流体和多相流领域得到应用。同样，物理和数学相关领域的技术发展将在理解颗粒流动方面得到应用。作为一个具体的例子，几十年前为液晶中间相提出的各向异性流体的流变学模型现在被应用于稠密颗粒流的模拟。同样，斯托克斯悬浮液的理论和计算工具的发展现在被应用于生物系统的分析，如游泳微生物。因此，促进这些社区之间的互动将对所有这些领域都有重大好处。

1147517PI: LealThis symposium is sponsored by IUTAM (International Union of Theoretical and Applied Mechanics) as one of the approximately 15 chosen by the IUTAM General Assembly for the current two year period. The main themes of this meeting are granular flows, particle-fluid suspensions, and suspensions of flexible and/or swimming cells and microorganisms. Although there have been meetings and workshops on the individual topics, this is the first meeting so far as the proposer is aware that combines these subjects to seek a synergistic interaction, and thus push all of the topical areas forward. Particle and particle-fluid flows are ubiquitous in nature and in industrial processes, yet their mechanics and kinematics is poorly understood. Such an understanding would be of great value in the design and optimization of processes for the chemical, mineral, food and pharmaceutical industries, and also in mitigating the effects of natural disasters such as avalanches and debris flows. Several factors contribute to the lack of understanding of these systems, such as the complex nature of grain interactions (e.g., friction in dry systems, hydrodynamic interactions in suspensions), limited understanding of the statistics of grain interactions and microstructure, and the strong dependence of these properties on the nature of forcing. The emphasis of this meeting will be on the regimes of flow wherein the particles are mobile or free to flow.The mathematical tools and experimental techniques developed for the granular and suspension flows find application in many areas of complex fluids and multiphase flows. Equally, the development of techniques in allied areas of physics and mathematics will find applications in the understanding of particulate flows. As a specific example, rheological models for anisotropic fluids that have been proposed several decades ago for liquid crystalline mesophases now find application in the modeling of dense granular flows. Similarly, the developments of theoretical and computational tools for Stokesian suspensions now find application in the analysis of biological systems such as swimming microorganisms. Thus, fostering interaction between these communities will therefore be of significant benefit to all these areas.