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提出了一种新的Euler与Boltzmann方程结合的气动加热数值计算方法。该方法首先采用CFD软件中的FLUENT来获取三维复杂外形边界层外缘气动参数,通过可压缩格子Boltzmann方法(LBM)的微观非平衡粒子的流动和碰撞来模拟边界层中气体热流动过程,解决了工程方法和N-S方法的适用范围不足和计算效率低下的问题。在每个LBM的流动与碰撞的过程中通过更新密度分布函数来使得宏观的速度和温度计算得以耦合。同时,对热LBM模型还做了湍流比拟和改进来扩展其应用范围。最后,通过一组高超声速气动加热试验数据证明了该结合方案的正确性和有效性,并讨论了该结合方案较其它常用方法的优缺点。
A new numerical method of aerodynamic heating combining Euler and Boltzmann equations is proposed. In this method, FLUENT in CFD software is used to obtain the aerodynamic parameters at the outer edge of the 3D complex shape boundary layer. The flow and collision of microscopic non-equilibrium particles in the compressible Lattice Boltzmann method (LBM) are simulated to simulate the heat flow in the boundary layer. The engineering method and the NS method of inadequate scope and calculation efficiency of the problem. The macroscopic velocity and temperature calculations are coupled by updating the density distribution function during each LBM’s flow and collision. At the same time, the turbulence comparison and improvement of the hot LBM model are also extended to extend its application range. Finally, a set of hypersonic aerothermographic data was used to demonstrate the correctness and validity of the proposed protocol. The advantages and disadvantages of the proposed protocol compared with other commonly used methods were also discussed.