Algorithm Development for Turbulent Combustion Calculations

湍流燃烧计算的算法开发

• 批准号: 9113236
• 负责人: Stephen Pope
• 金额: --
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-10-01 至 1995-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9113236&HistoricalAwards=false
• 关键词: Algorithm; Development; Turbulent; Combustion; Calculations

The objective of the proposed work is to develop, test and demonstrate a new generation of numerical methods to solve the pdf equations for turbulent combustion. In several major industries, there is an increasing use of turbulent combustion models to aid the design and development of combustion devices. The usefulness of these methods has already been established, but it can be significantly enhanced through improvements in the modelling and computational implementation. PDF methods provide the needed capability to handle finite-rate kinetic effects, such as the formation of NOx and the burning of CO. However, the focus is not on modelling issues, but on the computational implementation of pdf methods. Industry requires methods that are much more accurate, robust and economical than those currently available. A radically new Monte Carlo method will be developed to solve the pdf equations. It will be second-order accurate in space and time; it will include a PISO-type mean pressure algorithm applicable both to low-speed and high-speed flow; it will incorporate advanced variance-reduction techniques (to reduce statistical errors); and, it will be structured for implementation on vector and parallel architectures.

这项拟议工作的目标是开发、测试和演示新一代数值方法来求解湍流燃烧的pdf方程。在几个主要行业中，越来越多地使用湍流燃烧模型来辅助燃烧设备的设计和开发。这些方法的用处已经确定，但可以通过改进建模和计算实施来显著增强。PDF方法提供了处理有限速率动力学效应所需的能力，例如NOx的形成和CO的燃烧。然而，重点不是建模问题，而是pdf方法的计算实施。工业需要比目前可用的方法更准确、更稳健和更经济的方法。将开发一种全新的蒙特卡罗方法来求解pdf方程。它在空间和时间上将是二阶准确的；它将包括适用于低速和高速流动的PISO类型的平均压力算法；它将采用先进的方差减少技术(以减少统计误差)；而且，它将被构建为在向量和并行体系结构上实现。