Acquisition of a Supercomputer for Theoretical Geophysics

9975753Cohen16处理器SGI/Cray SV1超级计算机的获得，峰值性能为19.2GFLOPS，这将使我们能够进行重要的理论地球物理计算，否则这些计算将不容易处理。我们还将升级和增加我们的RAID5网络文件服务器的容量，以维护我们的输入和输出数据集和代码。我们将利用该设备研究：(1)过渡金属离子和含铁矿物在高压下的行为；(2)钙钛矿和镁闪锌矿的扩散和流变学；(3)钙钛矿、镁闪锌矿、铁和其他重要地球相的高压高温弹性和滞弹性；(4)地幔中的对流和俯冲输运以及现实流变学对地幔对流的影响。目前主要的外部用户包括Lars Stixrude和他的团队(Univ.密歇根)和S.King(普渡大学)。这一设施在提供大量访问块的能力方面将是无与伦比的，特别是对于大容量内存作业。这一设施对我们的研究至关重要，如果没有它，我们的研究将陷入瘫痪。此次升级还将加强和维持NSF已经对我们的Cray系统进行的投资。可能的研究问题有：(1)正交硅酸盐钙钛矿的扩散、流变学、有限温度弹性和滞弹性(由NSF赞助的博士后Frederic Marton)；(2)亚铁和铁铁对镁钙钛矿和钙钛矿性质的影响(与NSF赞助的博士后Stephen Gramsch)；(3)铁的粘度和熔化曲线的高质量分子动力学模拟(主要外部用户L.Stixrude教授)；(4)通过矿物物理获得具有真实流变性的对流模型(主要外部用户：普渡大学S.King教授)。

9975753CohenThe acquisition of a 16 processor SGI/Cray SV1 supercomputer with peak performance of 19.2 GFLOPS will allow us to do important theoretical geophysics computations that would otherwise not be tractable. We also will upgrade and increase the capacity of our RAID 5 network file server to maintain our input and output data sets and codes. We will use the facility to study: (1) the behavior of transition metal ions and iron bearing minerals at high pressures; (2) diffusion and rheology of perovskite and magnesiowustite; (3) high-pressure high-temperature elasticity and anelasticity of perovskite, magnesiowustite, iron, and other important Earth phases; and (4) convective and subduction transport in the mantle and effects of realistic rheologies on mantle convection. Major outside users currently include Lars Stixrude and his group (Univ. Michigan), and S. King (Purdue Univ.). This facility will be unparalleled in ability to provide significant blocks of access, especially for large memory jobs. This facility is crucially needed for our research, which would be crippled without it. The upgrade would also enhance and sustain the investment NSF has already made in our Cray system. Research problems that will become possible are: (1) Diffusion, rheology, and finite temperature elasticity and anelasticity of orthorhombic silicate perovskite (with NSF sponsored post-doc Frederic Marton); (2) Effects of ferrous and ferric iron on properties of magnesiowustite and perovskite (with NSF sponsored post-doc Stephen Gramsch); (3) High quality molecular dynamics simulations of viscosity and melting curve of Fe (with major outside user Prof. L. Stixrude); (4) Convection modeling with realistic rheologies obtain via mineral physics (with major outside user: Prof. S. King, Purdue University).***