CAREER: Numerical Simulations of Transitional and Turbulent Hypersonic Flows

abstractcts - 0238390 m。马丁普林斯顿大学提出的研究重点是发展对高超音速过渡和湍流的基本理解。以前用于高超声速应用的湍流模型是使用不可压缩流的直接数值模拟数据或完美气体风洞数据进行校准的。因此，目前使用的模型不能代表高压缩性和温度水平的影响。因此，本研究将提供解决方案：(1)提高我们对过渡和湍流高超声速流动基本物理机制的理解；(2)提供准确、详细的资金流向数据库；(3)利用所获得的认识和数据库开发基于物理的标度定律，以准确预测这些流动。所提出的构型包括有和没有逆压梯度的过渡边界层和湍流边界层，以及围绕轴对称和椭圆截面锥体的流动。自由流扰动、马赫数和壁温条件对非反应和反应条件的影响将被研究。模拟的一个关键特征是在完全相同的条件下对实验数据进行验证。这项研究将对大量与大气层内外高超音速飞行相关的技术重要应用产生重大影响。同时，教育活动将解决重要和具有挑战性的工程问题，同时培养一个动态的学习环境。教育和推广计划的目标包括：(1)通过模块化科学计算、数据分析和数据库软件基础设施整合研究和教育；(2)为K-12、本科和研究生阶段的弱势群体的优秀学生组织外展活动；(3)维持和发展现有的课程。一项关键的计划活动是将计算基础设施集成到教室和科学界，以解决和分析流体流动问题。本科生和研究生将使用基础设施作为他们课程材料的一部分。其他教育和推广活动包括为来自低收入家庭的有前途的高中生开设的高超音速飞行暑期课程。这将为学生提供参与普林斯顿大学学术和文化生活的机会。与普林斯顿大学预科项目合作，将从特伦顿、尤因和普林斯顿地区的学校中选出20名学生。在为期三年的时间里，这些学生将参加为期一周的高超音速飞行课程。此外，还将为两名代表性不足群体的学生提供暑期实习机会。

ABSTRACTCTS-0238390M. MARTINPRINCETON UNIVERSITYThe proposed research is focused on developing a basic understanding of hypersonic transitional and turbulent flows. Previous turbulence models for hypersonic applications have been calibrated using direct numerical simulation data of incompressible flows or perfect gas wind tunnel data. Thus, the models that are used today do not represent the effects of high compressibility and temperature levels. Accordingly, this research will provide solutions for (1) improving our understanding of the fundamental physical mechanisms of transitional and turbulent hypersonic flows; (2) providing an accurate and detailed database of the flows of interest; and (3) using the gained understanding and database to develop physically-based scaling laws for the accurate prediction of these flows. The proposed configurations include transitional and turbulent boundary layers with and without adverse pressure gradient, as well as flow around axisymmetric and elliptical cross-section cones. The effects of free-stream disturbance, Mach number, and wall-temperature conditions will be studied for non-reacting and reacting conditions. A key feature of the simulations is the validation against experimental data at the exact same conditions. This research will have significant impact on a large number of technologically important applications related to hypersonic flight within and out of our atmosphere.Concurrently, education activities will address important and challenging engineering problems while fostering a dynamic learning environment. The goals of the education and outreach plan include: (1) integrating research and education via a modular scientific computing, data analysis, and database software infrastructure; (2) organizing outreach activities for talented students of under-represented groups in K-12, undergraduate and graduate levels; and (3) maintaining and building upon a current curriculum. A key planned activity is the integration of a computational infrastructure to solve and analyze fluid flow problems into the classroom and into the scientific community. Undergraduate and graduate students will use the infrastructure as part of their course materials. Other education and outreach activities include a summer course in hypersonic flight to promising high-school students from lower-income families. This will provide an opportunity for the students to participate in the academic and cultural life of Princeton University. In collaboration with the Prince-ton University Preparatory Program, twenty students will be selected from schools in the Trenton, Ewing and Princeton areas. For a period of three years these students will enroll in a week-long course sequence in hypersonic flight. In addition, summer internships will be offered to two students of under-represented groups.