报告题目：

Predictive Modeling and Simulations of High Energy Density (HED) Dynamic Response of Materials

microfluidic devices

报告人:                                 Bo Li, Ph.D

Assistant Professor of Mechanical and Aerospace Engineering

Case Western Reserve University

Cleveland, OH 44106 USA

时间：2014年7月2日(周三)  09:00-11:00

地点：中科院力学所主楼344会议室

报告摘要：

Numerical modeling of the dynamic response and failure of materials under extreme conditions is a long-standing challenge in computational mechanics. It places exact demands on numerical solvers, physics-based material models and high performance computing. We present here a novel computational approach, the Optimal Transportation Meshfree(OTM) method, to address these challenges. The OTM method based on a combination of Optimal Transportation theory, material point sampling and Local Maximum Entropy interpolation, provides a robust and efficient solution for general fluid and solid dynamic flows, possibly involving multiple phases, viscosity and general equations of state, general inelastic and history dependent constitutive relations, arbitrary variable domains and boundary conditions. A variational material point failure algorithm (Eigenerosion) within the OTM framework is developed to predict the fracture and fragmentation in materials under extreme conditions.  The range and scope of the method is also demonstrated in our monolithic Lagrangian Fluid-Structure-Interaction (FSI) simulations. The second part of this presentation will focus on the multiscale modeling of materials strength and failure in extreme dynamic environment. A variational thermomechanical concurrent multiscale computational framework will be introduced that allows for direct numerical simulation of the polycrystalline structure coupled with void growth, single crystal plasticity, phase transformation, physics-based hardening and rate sensitivity laws. Due to the complexity nature of these computations, I will also touch upon the development of the massively parallel implementation of the Optimal Transportation Meshfree (pOTM) method to take advantage of high performance computing systems.

报告人简介：

Bo Li is an assistant professor in the Department of Mechanical and Aerospace Engineering at Case Western Reserve University (CWRU). His research focuses on solid and computational mechanics, meshfree methods, failure processes in solids, biomechanics, thermal-fluid-structure interaction and high performance computing. Prof. Li received his Ph.D. in Aerospace Engineering from California Institute of Technology (Caltech) in 2009. He became a staff scientist at the Graduate Aerospace Laboratories at Caltech (GALCIT) and the Caltech Center for Advanced Computing Research (CACR) from 2009-2013. In 2013, Dr. Li joined the Department of Mechanical and Aerospace Engineering at CWRU. Prof. Li has coauthored a number of refereed journal articles for the predictive modeling and simulations of high energy density dynamic response of materials in extreme events such as ballistic/hypervelocity impact (from 100m/s to 10km/s), blast loading and nuclear fusion.