Presidential Young Investigators Award: Simulation of Complex Reacting Flows

总统青年研究员奖：复杂反应流模拟

• 批准号: 9057460
• 负责人: Peyman Givi
• 金额: $ 10.79万
• 依托单位: SUNY at Buffalo
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-09-01 至 1993-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9057460&HistoricalAwards=false
• 关键词: Presidential; Young; Investigators; Award; Simulation

A computer code is to be constructed to simulate three- dimensional unsteady turbulent reactive flows, based upon a spectral element algorithm which combines the accuracy of pseudospectral methods with the versatility of finite-element techniques. The large eddy simulation technique will be used, in which the subgrid turbulent motion is modeled approximately while the large scale structures are calculated directly. A single-point probability density function method will be developed for the scalar subgrid closure, and a two-equation subgrid model will be employed for the hydrodynamic closure. In a second program, the effects of compressibility on hyper- velocity three-dimensional reacting turbulent flows will be investigated using a hybrid finite difference/element pseudospectral algorithm. Several recently developed shock capturing schemes will be implemented for high Mach number flow simulations. The thorough understanding of turbulent reactive flows is essential to operate modern engines and power systems within the constraints of high efficiency and low emissions, and the next generation of supersonic aircraft poses questions which may not be answerable through traditional experimentation and development techniques. This research program will provide new tools for engineers to extract answers to many of those questions.

将基于光谱元素算法模拟三维不稳定的湍流反应流的构建计算机代码，该频谱元素算法将伪谱方法的精度与有限元技术的多功能性结合在一起。 将使用大型涡流模拟技术，其中在直接计算大规模结构的同时，对亚网格湍流运动进行了建模。 将为标量亚网格闭合开发单点概率密度函数方法，并将采用两个方程式亚网格模型进行流体动力闭合。 在第二个程序中，将使用混合有限差/元素伪元素算法研究可压缩性对高速速率反应湍流的影响。 对于高马赫数流量模拟，将实施一些最近开发的冲击捕获方案。 对动荡的反应流的透彻理解对于在高效率和低排放的限制内操作现代发动机和电源系统至关重要，而下一代超音速飞机提出的问题可能通过传统的实验和开发技术无法解决问题。 该研究计划将为工程师提供新的工具，以便为许多问题提取答案。