(1.嘉兴学院建筑工程学院,浙江 嘉兴314001;2.河海大学力学与材料学院,江苏 南京211100;3.河海大学港口海岸与近海工程学院,江苏 南京210098)

O242.1；O357.1

Numerical analysis of flow past iced conductor based on S-A model
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(1.College of Engineering＆Architecture, College of Mechanics and Materials, Jiaxing University, Jiaxing 314001, China;2.College of Mechanics and Materials, Hohai University, Nanjing 211100, China;3.College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China )

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摘要:

基于Spalart-Allmaras湍流模型(S-A模型)封闭的雷诺平均N-S方程,采用沿均匀流线的三阶Runge-Kutta法和Galerkin法分别进行时间和空间离散,得到了湍流方程的有限元格式。采用自编Matlab程序,数值模拟了不同风攻角下覆冰输电线绕流问题,得到了覆冰输电线绕流瞬态和时均流场、气动力系数时程曲线和平均气动力系数随风攻角的变化关系,并与试验结果进行对比,验证了该算法的有效性。基于流场演化和平均压力分布,分析表明风攻角变化引起的边界层分离点转移是产生升力系数尖峰突跳现象的主要原因。

Abstract:

Based on the Reynolds averaged N-S equation closed by the Spalart-Allmaras turbulence model(S-A model), the third-order Runge-Kutta method along the uniform streamline and Galerkin method are used for the temporal and spatial discretization respectively, and the finite element discretization scheme of the turbulence equation is obtained. Based on the self-compiled MATLAB program, the flow past an iced conductor under different wind attack angles is numerically simulated. The transient and time averaged flow fields, the time history curves of aerodynamic coefficient and the average aerodynamic coefficients variation with wind attack angle are obtained. The comparison with the experimental results shows the effectiveness of the proposed finite element algorithm. Based on the analysis of flow field evolution and average pressure distribution, it can be found that the transfer of boundary layer separation point caused by the change of wind attack angle is the main reason for the sharp jump of lift coefficient.

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##### 历史
• 收稿日期:2022-01-21
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• 在线发布日期: 2023-03-15
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