基于地形高程数据的复杂地形风场建模方法

Simulation of wind field over complex terrain based on elevation data

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.

A numerical simulation method for the wind field over complex terrain was developed. The complex terrain was represented by a surface, which was established by the surface spline method based on the contour line of the map. Then it was divided into panels containing vortex ring singularities. The singularity distribution was solved by combining with the potential flow theory and the boundary condition of terrain sur- face. Finally, the wind field was simulated by linear superposition of the uniform stream and the induced ve- locity of vortex rings. A numerical example was studied, and the result was also compared with the one ob-tained by existing method. It indicates that the method proposed could describe the terrain much more accu-rately and provide a reasonable result of wind field distribution, but has a simple and efficient procedure, which is suitable for the engineering use in flight dynamics.