单次扫描空间推进算法在高超声速流动中的适用性研究
Study on the reliability of a single-sweep space marching algorithm for hypersonic flows
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摘要: 通过高超声速流动的三个典型算例,研究单次扫描空间推进(SSPNS)算法计算高超声速流场气动力、气动热的精度以及适用范围.结果表明:①在楔角不大于15°,流动无流向分离的情形下,用SSPNS算法计算压缩楔板流动是可行的;②对绕圆锥流动的计算表明,SSPNS算法对横向分离的模拟是值得信赖的;③对于12°攻角以内的小攻角绕翼流动,SSPNS算法的精度与时间迭代法基本一致;④空间推进法计算速度较时间迭代CFD(计算流体动力学)方法提高1~2个数量级.Abstract: The accuracy of a single-sweep parabolized Navier-Stokes(SSPNS) algorithm for aeroforce and aeroheating prediction in hypersonic flow fields has been tested through three typical cases.The results suggest: 1) It is feasible for the SSPNS algorithm to predict hypersonic laminar compression corner flows with wedge angle smaller than 15°,when there is no obvious streamwise flow separation.2) According to the numerical results of cone flows(biggest attack angle 24°),the simulation of transverse separations with the SSPNS algorithm are reliable.3) For the flows over a two-dimensional wing with attack angle smaller than 12°,the accuracy of the SSPNS algorithm corresponds to that of time-iterative algorithm.4) As compared to the traditional time-iterative full Navier-Stokes,the SSPNS algorithm's computational speed is faster by 1~2 order of magnitude and presents a considerable storage saving.
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Key words:
- reliability /
- hypersonic flows /
- aeroforce /
- aeroheating /
- space-marching algorithm
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