A New Geodynamo Model Using the Domain Decomposition Method on Parallel Computers

并行计算机上采用域分解方法的新地球发电机模型

• 批准号: 0105945
• 负责人: Gerald Schubert
• 金额: $ 30万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-15 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0105945&HistoricalAwards=false
• 关键词: New; Geodynamo; Model; Using; Domain

Schubert 0105945 The main objective of this research project is to develop a new generation numerical geodynamo model based on a domain decomposition technique that divides the fluid part of the Earth's core into six identical subdomains with the same metric tensor and nearly uniform grids. The computationally expensive Legendre transform is no longer needed and many available efficient algorithms can be used in each subdomain. The pole singularities of spherical coordinates are removed. The new model will be particularly suitable for efficient implementation on parallel computers. Preliminary results obtained for a kinematic dynamo model show that the proposed domain decomposition technique is both workable and extremely efficient. A convection-driven, nonlinear geodynamo model will be developed for a rotating spherical shell that will operate at an Ekman number smaller than 10^{-6}.

Schubert 0105945 该研究项目的主要目标是开发基于域分解技术的新一代数值地球发电机模型，该模型将地核的流体部分划分为六个相同的子域，具有相同的度量张量和几乎均匀的网格。不再需要计算成本高昂的勒让德变换，并且可以在每个子域中使用许多可用的高效算法。球坐标的极点奇点被移除。新模型将特别适合在并行计算机上高效实现。运动发电机模型获得的初步结果表明，所提出的域分解技术既可行又非常有效。 将为旋转球壳开发一个对流驱动的非线性地球发电机模型，该模型将在小于 10^{-6} 的埃克曼数下运行。