摘要: The goal of this research project is to develop new advanced numerical methods and to perform DNS studies of transient hypersonic reacting flows over full 3-D maneuvering vehicles. The DNS tools and supporting theoretical approach... 展开 The goal of this research project is to develop new advanced numerical methods and to perform DNS studies of transient hypersonic reacting flows over full 3-D maneuvering vehicles. The DNS tools and supporting theoretical approaches are used to gain new fundamental understanding of transition phenomena of 3-D chemically-reacting hypersonic boundary layers. In the three-year period, significant progress has been made in the DNS of hypersonic boundary-layer flow instabilities in the following areas: (1) receptivity of 3-D hypersonic flows over blunt elliptical cones, (2) nonlinear breakdown of 3-D Gortler vortices, and (3) reacting hypersonic flow receptivities and stabilities. We have also finished the development of linear stability codes for hypersonic flow and have started the work on developing new parallel implicit algorithms for DNS of reacting hypersonic flows. So far, we have developed new methodologies and have demonstrated the feasibility of our approach as a practical DNS tool to explore transient hypersonic reacting flow physics. The focus of future work is on the DNS studies of the hypersonic flow physics related to the hypersonic boundary layer transition, and to extend these DNS and theoretical studies to 3-D transient hypersonic flows with complex real- gas models and complex geometries, and the DNS of nonlinear breakdown and interactions of instability modes in hypersonic boundary layers. 收起