细网格非静力二维高阶闭合模式对山体流场特征的模拟分析  

SIMULATIVE ANALYSIS FOR THE CHARACTERISTICS OF RIDGE TURBULENT FLOW FIELD BY USING A TWO-DIMENSION FINE-MESH NON-HYDROSTATIC HIGHER ORDER TURBULENCE CLOSURE MODEL

作　　者：刘红年[1] 蒋维楣[1] 

机构地区：[1]南京大学大气科学系

出　　处：《高原气象》1994年第4期430-440,共11页Plateau Meteorology

基　　金：国家自然科学基金

摘　　要：本文采用二阶矩湍流闭合方案，分别就非静力和准静力两种条件建立ＰＢＬ数值模式，并模拟了二维山脊流场的结构，计算了二维山体对气流平均场和湍流场的影响。计算结果表明，无论是平均场还是湍流场，采用准静力假设都会造成模拟结果的较大偏差，且对平均场的影响比对湍流场的影响更为显著。两种模式计算结果的差别还随地形坡度和背景风增大而增大。The effects of a 2-D ridge flow field on the mean flow and turbulence structure in the neutral surface layer were numerically investigated by using a non-hydrostatic higher-order turbulence closure model developed in this paper. The influences of the shape of the hill and the surface roughness of ridge on the fluctuation of flow around hill were discussed. The results show that a large discrepance was produced when the hydrostatic assumption was adopted, especially on the mean flow field. When the hill become steeper or background wind speed become larger,this discrepance is more considerable.

关 键 词：高阶闭合模式 过山气流 非静力模式 气流 

分 类 号：P448[天文地球—大气科学及气象学]