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对计算流体力学中的域动分层法动网格更新技术进行了阐述,并且应用该方法对无人机发射时的燃气流场进行数值模拟,得到全流场参数在三维空间上的时间分布.无人机每个时刻的运动速度事先根据推力曲线计算好,随着无人机的运动,根据相应变化的运动边界更新网格,并且计算新网格下的流场分布,相应的流场边界条件也会发生变化.通过分析计算得到的箱上各监测点的压力分布曲线,了解冲击波在箱体表面传播的过程和产生的影响,结果可以为工程应用提供有力的参考.
This paper elaborates the dynamic mesh updating technique of domain moving layer method in computational fluid dynamics, and applies the method to simulate the gas flow field when the UAV launches, and obtains the time distribution of the full flow field parameters in the three-dimensional space The UAV ’s velocity at each moment is calculated according to the thrust curve in advance. As the UAV moves, the mesh is updated according to the corresponding motion boundary and the flow field distribution under the new mesh is calculated. The corresponding flow field boundary The conditions will also change.Through the analysis of the calculated pressure distribution curve of each monitoring point on the box to understand the shock wave propagation in the box surface and the impact of the results can provide a strong reference for engineering applications.