摘要
本文在定常和中性层结条件下应用有限元法初步建立了一个能够处理二线复杂地形上边界层问题的数值模式。模式使八节点抛物型等参元,有限元方程组用“波前法”求解。应用模式计算了几种典型地形上的近地层流动。模拟出了风速、气压、湍流动量通量以及湍流交换系数等气象要素的主要分布特征,并将计算结果与有关的观测事实做了比较。
A description is given of the application of the finite element method to solve the two-dimensional neutrally stratified surface-layer flow problems over terrain. The velocity components and the turbulent viscosity are approximated over each element by quadratic interpolation functions, while linear interpolation is used for the pressure. The mix-length scale of turbulence is specified algebraically. The problem is then reduced to the solution of a set of nonlinear algebraic equations, and the frontal method of solution is adopted. Illustrative examples are wind flow over escarpment, triangle hill and embankment.
出处
《气象学报》
CSCD
北大核心
1990年第2期129-138,共10页
Acta Meteorologica Sinica
