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结冰模拟软件AERO-ICE中的关键数值方法-2021增刊

李浩然,段玉宇,张宇飞,陈海昕   

  1. 清华大学
  • 收稿日期:2021-09-13 修回日期:2021-10-04 出版日期:2021-10-09 发布日期:2021-10-09
  • 通讯作者: 陈海昕
  • 基金资助:
    国家自然科学基金;国家自然科学基金;国家重大项目

The Numerical Method of Ice-accretion Software AERO-ICE

  • Received:2021-09-13 Revised:2021-10-04 Online:2021-10-09 Published:2021-10-09
  • Contact: Haixin Chen

摘要: 自然积冰对于航空飞行安全造成重大隐患,飞机在穿越富含过冷水汽的云层时冰形将按一定的物理规律积聚生长。本文介绍了一款三维结冰数值模拟软件AERO-ICE,该软件由网格自动生成、空气流场RANS计算、水滴场Euler方法计算、结冰热力学分析四个模块组成。在空气流场计算方面,采用SPF k-(v^2 ) -ω湍流模型,该模型引入非平衡特性湍流修正,从而改善了非流线体大分离流动的预测精度。水滴场Euler方程由于源项较大,迭代求解时容易发散,AERO-ICE软件采用流场光顺、二阶MUSCL空间离散以及LU-SGS隐式时间推进方法改善了数值稳定性。在结冰热力学分析模块,AERO-ICE软件同时具有Messinger与Myers模型,并将Messinger模型预估的壁面温度作为Myers模型的边界条件,从而解决了Myers模型温度设置的经验性问题。AERO-ICE软件支持多块网格、多重网格加速技术与大规模并行计算,所得到冰形计算结果得到了初步的验证。

关键词: 结冰过程数值模拟, 结冰热力学分析, 欧拉方法多相流计算, 水膜流动, 非流线体大分离

Abstract: Natural ice-accretion poses threat to aviation flight safety. The ice will be accumulated according to certain physical laws when the aircraft passes through the clouds rich in supercooled water vapor. This paper introduces a three-dimensional numerical simulation software AERO-ICE. The software is composed of four modules: automatic grid generation, RANS calculation of air flow field, Euler calculation of water drop field and thermodynamic analysis of icing. In the calculation of air flow field, the SPF k-(v^2 ) ?-ω turbulence model is adopted, which introduces the correction of non-equilibrium characteristics of turbulence, so as to improve the prediction accuracy of non-streamlined large separation flow. Because of the large source term, the Euler equation of water drop field is easy to diverge in iterative solution. AERO-ICE software uses flow field smoothing, second-order MUSCL space discretization and LU-SGS implicit time marching method to improve numerical stability. In the icing thermodynamic analysis module, the AERO-ICE software has both Messinger and Myers models. The wall temperature predicted by the Messinger model is used as the boundary condition of the Myers model, thus solving the empirical problem of temperature setting in the Myers model. AERO-ICE software supports multi-grid, multi-grid acceleration technology and large-scale parallel computing. The calculation of the ice-accretion results have been preliminarily verified.

Key words: ice-accretion simulation, icing thermodynamic analysis, Euler method multiphase flow calculation, water film flow, non-streamlined body with large separation