不同建筑物宽高比的街道峡谷内部气流场数值模拟

基于标准的k—ε双方程湍流模型，数值模拟了2种峡谷宽高比和4种建筑物宽高比下的开阔地域街道峡谷内部气流场．模拟结果表明，峡谷上部生成一顺时针大旋涡，并在此大旋涡的驱动下，峡谷内部形成一个逆时针旋涡；建筑物宽高比(W／H)对峡谷内部气流场具有显著影响，在W／H较小的情况下(如W／H=1／5)，峡谷上部顺时针旋涡向峡谷内扩展而挤压峡谷内的逆时针旋涡，在峡谷宽高比(B／H)一定的前提下，上部顺时针旋涡向峡谷内部扩展的程度随w／H的减小而增大，而在w／H一定的条件下，上部顺时针旋涡向峡谷内部扩展的程度随B／H的加大而增强．从上述峡谷内部流场的特征中可推断出，在建筑物高度一定的条件下，缩小建筑物宽度和加大峡谷宽度会增强峡谷内外空气的交换，从而有利于峡谷内空气品质的改善．

Numerical simulations of wind field within street canyons in open areas under different building width to height ratios

Courses constructing is a basic project for improving instruction quality totally, which is also meaning to improve the level of running a university. Management by Objectives is one of the modern management methods, which has been one important part of the enterprise management with the continued developing in management practice. This thesis absorbs the fruit from modern enterprise management and makes some preliminary research on Management by Objectives in university courses constructing.