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提出了一种以地形高程数据为基础,进行三维复杂地形建模及其风场分布求解的数值仿真方法.该方法利用曲面样条插值技术建立复杂地形的三维数字模型,并将地形曲面离散为若干个涡环网格,结合位势流理论与地面边界条件计算得到复杂地形影响下的三维风场.数值计算结果显示,相比基于球绕流理论的工程模拟方法,该方法可对复杂地形做出更为真实的描述,并给出更为合理的风场分布形式.同时该方法建模过程简单,便于实际操作,适于飞机飞行性能评估或飞行模拟器环境建模的工程应用.
This paper presents a method of numerical simulation based on terrain elevation data to model three-dimensional complex terrain and solve the distribution of wind field.This method uses surface spline interpolation technology to build a three-dimensional digital model of complex terrains, A number of vortex-ring grids are combined to calculate the three-dimensional wind field under the influence of complex terrain with the combination of potential flow theory and ground boundary conditions. Numerical results show that compared with the engineering simulation method based on ball-flow theory, Make a more realistic description and give a more reasonable distribution form of the wind field.At the same time, this method has a simple modeling process and is convenient for practical operation and is suitable for engineering application of aircraft flight performance evaluation or flight simulator environment modeling.