可压缩流动脉动压力数值模拟求解器HFS研究

目的发展模拟可压缩流动的高精度流场求解器(HFS),用于研究高马赫数钝体绕流的表面压力脉动。方法基于一般曲线坐标系下的可压缩Navier-Stokes方程,采用具有激波捕捉能力的高阶有限差分法WCNS-E进行离散。基于大规模并行计算对高马赫数钝锥绕流进行直接数值模拟(DNS),获得高精度的流场数据。结果 Blast wave测试结果表明,采用不同的WCNS格式的模拟结果与参考解吻合良好。采用HFS模拟来流冲击NACA0012翼型表面的计算结果与NASA的OVERFLOW程序的计算结果以及实验结果均符合良好。结论典型的测试算例表明,HFS能稳定且准确地捕捉强间断,对于复杂几何构型流场也能准确计算。采用HFS研究了钝锥绕流,捕获了钝锥边界层的层流、转捩和完全发展湍流等流动现象,获得了壁面脉动压力的时空分布。

A HFS Solver for Simulation of Fluctuation Pressure in Compressible Flow

The flow on the surface of high-speed aircraft is mainly characterized by turbulence and transition. The purpose of this study is to develop a high order precision compressible flow solver (HFS) to investigate the pressure fluctuations in compressible flow around a blunt-body. The compressible Navier-Stokes equations are solved in the general curvilinear coordinate system. High order WCNS-E scheme is used for the spatial discretization in order to capture shock waves. With large-scale parallel computation, high fidelity data of hypersonic flow over a blunt body can be obtained by DNS. The Blast wave test results show that the simulation results using different WCNS formats are in good agreement with the reference solution. The calculation results of the impact on the NACA0012 airfoil surface by HFS simulation are in good agreement with the calculation results of NASA''s OVERFLOW program and the experimental results. Typical test cases show that HFS can stably and accurately capture strong discontinuities, and can also accurately calculate flow fields with complex geometric configurations. The HFS is used to study the flow around the blunt cone, and the flow phenomena in the blunt-body boundary layer, such as laminar flow, transition and fully developed turbulence are captured, and the temporal and spatial distribution of wall fluctuation pressure is obtained.