Presidential Young Investigators Award: Simulation of Complex Reacting Flows

一个计算机代码将被构建来模拟三个- 三维非定常湍流反应流，基于一个 谱元算法，它结合了精度 伪谱有限元法 技术. 采用大涡模拟技术， 其中亚网格湍流运动被近似地模拟 而大尺度结构则直接计算。 一 单点概率密度函数法将 开发的标量次网格封闭，和两个方程 水动力学闭合采用亚网格模型。 在第二个程序中，压缩性对超 速度三维反应湍流将是 用混合有限差分/单元研究 伪谱算法 最近发生的几起休克事件 对于高马赫数，将采用捕获方案 流动模拟 对湍流反应流的透彻理解是 对于操作现代发动机和动力系统至关重要， 高效率和低排放的限制， 下一代超音速飞机提出了一些问题， 可能无法通过传统的实验来回答， 开发技术。 该研究计划将提供 新的工具，工程师提取答案，其中许多 问题.

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.