项目名称: 激波-湍流边界层干涉中的湍流机理和模型改进研究
项目编号: No.11302012
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 数理科学和化学
项目作者: 方剑
作者单位: 北京航空航天大学
项目金额: 28万元
中文摘要: 本课题旨在采用直接数值模拟(DNS)和大涡模拟(LES)方法对激波-湍流边界层干涉(STBLI)现象进行机理研究,通过分析STBLI中的非平衡湍流输运特性和深入挖掘其中的物理机制来发展湍流模型,提高雷诺平均方法(RANS)对STBLI模拟的准确性和在高超工程应用中的可靠性。为达到该研究目标,本课题将首先利用课题组发展的低耗散保单调格式对STBLI开展DNS和LES,获得高精流场数据库。通过对流场数据的分析,本课题将研究STBLI中的激波大尺度低频运动现象、湍流增强机理和湍流非平衡输运特性等关键流动问题,并挖掘其中的物理机制。在此基础上,本课题将进一步发展课题组提出的"基于湍流输运特性改进湍流模型"的方法,将STBLI中的非平衡输运特性通过建立合理的数理模型引入到湍流模型中,最终提高RANS对STBLI的模拟精度。
中文关键词: 激波/湍流边界层干涉;直接数值模拟;计算流体力学;湍流模型;湍流输运特性
英文摘要: This project is dedicated to investigate the complex flow mechanism and turbulence modeling in shock-turbulent boundary layer interaction (STBLI). Firstly, a newly developed low-dissipation shock-capturing scheme will be adopted to conduct the direct numerical and large-eddy simulations of STBLI and built high fidelity flow database. The study of complex flow mechanisms, such as the low-frequency large-scale shock movement, the turbulence amplification mechanism and the non-equilibrium turbulence transport property will then be developed based on the flow data analysis. Further improvement of the turbulence models will be made with deeper insight into the turbulence mechanism and turbulent transport property in STBLI acquired in the previous research. By using the method of improving turbulence based on turbulence transport nature, the non-equilibrium turbulence transport property will be at last modeled and introduced to the turbulence model in Reynolds-averaged Navier-Stokes equations (RANS) to improve the accuracy of RANS in STBLI and its reliability in the hypersonic engineering.
英文关键词: shock-wave/turbulent boundary layer interaction;direct numerical simulation;computational fluid dynamics;turbulence modeling;turbulence transport property