A New Dynamical Core for the Unified Model: Conservation Properties, Model Grids and Time-Stepping

统一模型的新动态核心：守恒属性、模型网格和时间步长

• 批准号: NE/I022094/1
• 负责人: Alan Gadian
• 金额: $ 25.79万
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2011
• 资助国家: 英国
• 起止时间: 2011 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FI022094%2F1
• 关键词: New; Dynamical; Core; Unified; Model

A test-bed for investigating three essential aspects of a new dynamical core for the Unified Model will be established, building on the current NCAS Microscale Model. The features to be investigated are the conservation properties of the equations and their discretisation, the computational grid and the method for advancing the model in time without exciting acoustic modes. The new approaches will be evaluated and compared with existing approaches, paying particular attention to accuracy and speed in massively parallel implementations. A new implementation of the Microscale Model will be based on a re-casting of the model equations in conservative form; this is likely to be of particular importance for climate modelling. Massively parallel implementations of the Microscale Model will be be created with both rectangular and hexagonal horizontal grid structures and the efficiency of these will be evaluated. In addition to the current split-explicit time-stepping version of the model, a second version will be established using a Helmholtz solver for determination of the pressure, allowing much larger time-steps but simultaneously creating challenges for efficient parallel implementation. The outcomes of these evaluations will feed into the design of the next generation Unified Model.

将在目前的NCAS微尺度模型的基础上，建立一个试验台，用于研究统一模型的新动力核心的三个基本方面。所要研究的特点是方程及其离散化的守恒性、计算网格以及在不激励声学模式的情况下及时推进模型的方法。将对新方法进行评估，并与现有方法进行比较，特别注意大规模并行实施的准确性和速度。微尺度模式的新实施将以保守形式的模式方程式的重铸为基础；这可能对气候模拟特别重要。将创建具有矩形和六边形水平网格结构的微尺度模型的大规模并行实施，并将评估这些结构的效率。除了目前的分裂-显式时间推进模型版本外，将使用Helmholtz求解器建立第二个版本来确定压力，允许更大的时间步长，但同时也给高效的并行实施带来了挑战。这些评估的结果将纳入下一代统一模型的设计。

项目成果

Demonstration of a Cut-Cell Representation of 3D Orography for Studies of Atmospheric Flows over Very Steep Hills

• DOI: 10.1175/mwr-d-11-00069.1
• 发表时间: 2012-02
• 期刊: Monthly Weather Review
• 影响因子: 3.2
• 作者: Sarah‐Jane Lock;H. Bitzer;A. Coals;A. Gadian;S. Mobbs

Numerical analyses of Runge-Kutta implicit-explicit schemes for horizontally explicit, vertically implicit solutions of atmospheric models

大气模型水平显式、垂直隐式解的龙格-库塔隐式-显式方案的数值分析

• DOI: 10.1002/qj.2246
• 发表时间: 2014
• 期刊: Quarterly Journal of the Royal Meteorological Society
• 影响因子: 8.9
• 作者: Lock S