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| A robust Riemann solver and moving overset grids for viscous flow computation of rotors |
| Received:December 22, 2012 Revised:April 25, 2013 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201404018 |
| KeyWord:helicopter rotor viscous flows robust Riemann solver moving overset grids full implicit dual-time stepping method |
| Author | Institution |
| 徐丽 |
上海交通大学 数学系, 上海 ;上海电力学院 数理学院, 上海 |
| 翁培奋 |
上海大学 上海市应用数学和力学研究所, 上海 |
| 吴泉军 |
上海电力学院 数理学院, 上海 |
| 张开军 |
上海电力学院 数理学院, 上海 |
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| Abstract: |
| A numerical method has been developed to simulate the flow fields around helicopter rotors in hover with a robust Riemann solver and a moving overset grid technique.In the inertial coordinate system, the governing equations are Reynolds averaged Navier-Stoke equations for the unsteady flow fields around hovering rotors.Convective terms are discretized by the Roe approximate solver based on a fifth-order weighted essentially non-oscillatory scheme.A full implicit dual-time stepping method with the Newton type LU-SGS sub iteration is adopted for the unsteady time advance.The moving overset grids are used to enforce rotation and capture wake.The surface pressure coefficients of the hovering rotor blade and the tip vortex core positions accord with the experimental data.The numerical results indicate that the present method has high resolution for tip vortices, and can well capture shock.So the method could be further developed to compute the viscous flows around rotors in forward flight. |