U.S.-Japan Cooperative Science: Modelling and Visualizing the Complexity of Mantle Convection in Heterogeneous Medium

9815544元该奖项支持美国明尼苏达大学袁国强教授与日本广岛大学本田悟教授为期两年的合作研究项目。研究人员将对非均质介质中地幔对流的复杂性进行建模和可视化研究。地幔的非均质性是由于各种来源的混合和搅拌。由于流变学依赖于应力、应变速率、晶粒尺寸和成分，这反过来又会在粘度场中产生非均质性。板也可以被认为是一种复杂的流变介质，它的强度很大程度上取决于俯冲的速度。研究人员计划研究非均质粘性流体在对流中的混合动力学和地幔对流中晶粒尺寸的影响，特别是晶粒尺寸增长与粘性加热和板块俯冲强度的相互作用。他们还将研究美国和日本的数值模拟数据集的可视化协同处理问题。该项目汇集了两个具有互补专业知识和研究能力的实验室的努力。研究人员将使用明尼苏达、洛斯阿拉莫斯和IBM沃森实验室出色的高性能计算和科学可视化技术。在日本，他们可以使用高性能的IBM集群、东京大学的日立计算机和广岛大学的Digital-alpha集群。这项联合工作的重要成果将涵盖固体地球动力学、非均匀对流流体混合、高性能网络计算和先进科学可视化技术等领域。年轻的科学家和研究生也将参与这个项目。研究人员计划在美国和日本的大学网站上分享他们的研究结果。通过思想和技术的交流，该项目将扩大我们的基础知识基础，促进国际间的了解与合作

9815544YuenThis award supports a two year collaborative research project between Professor David Yuen of the University of Minnesota and Professor Satoru Honda of Hiroshima University in Japan. The researchers will be undertaking a study of modeling and visualizing the complexity of mantle convection in a heterogeneous medium. Heterogeneities in the mantle are due to the mixing and stirring of a wide variety of sources. These will in turn produce heterogeneities in the viscosity field, because of the rheological dependence on stress, strain-rate, grain-size and composition. The slab can also be considered as a complex rheological medium and its strength may be strongly dependent on the speed of subduction. The researchers plan to study the dynamics of mixing in hetergeneous viscous fluids in convection and the effects of grain-size in mantle convection, especially the interaction between grain-size growth and viscous heating and the strength of slabs with subduction. They will also work on issues of co-processing in visualization of data sets taken from numerical simulations in both the U.S. and Japan. This project brings together the efforts of two laboratories that have complementary expertise and research capabilities. The researchers will have the use of the excellent high-performance computing and scientific visualization at Minnesota, Los Alamos and the IBM Watson Lab. In Japan they will have access to the high-performance IBM clusters, the University of Tokyo's Hitachi computer and the Digital-alpha cluster at Hiroshima University. Important outcomes of this joint work will cover the areas of solid-earth geodynamics, mixing in heterogeneous convecting fluids, high-performance network computing, and advanced scientific visualization techniques. Younger scientists and graduate students will also be participating in this project. The researchers plan to share the results of their research on their university web sites in the U.S. and Japan. Through the exchange of ideas and technology, this project will broaden our base of basic knowledge and promote international understanding and cooperation.***