中文摘要：

从 k-ε湍流模型控制方程入手，对两类满足平衡大气边界层理论要求的入口边界条件进行了详细分析，比较了二者的理论差异。然后以我国公路桥梁抗风规范中建议的 A 类风场为来流条件，定义了相应的 k-ε模型常数与壁面条件，使用两类边界条件进行数值模拟。计算结果表明：两类边界条件结合相应的模型常数与壁面条件，均能在数值模拟中构建基本满足规范要求的平衡大气边界层，但各有其适用范围。在此基础上，对模型常数 C 1和湍动能耗散率与数值模拟结果之间的关系进行了研究，采用修改模型常数与边界条件的方法，改善了数值模拟结果。

英文摘要：

Proceeded from the k-ε turbulence model control equation,two kinds of boundary conditions meet the theoretical conditions of horizontally homogenous Atmosphere Boundary Lay-er（ABL）were studied in detail,and their theoretical differences were compared.And then the class A wind field,which is suggested by the Chinese Wind-resistant Design Specification for Highway Bridges,was simulated as the inlet flow conditions in full scale using these two kinds of boundary conditions,with adapted k-ε model constants and wall conditions well defined.The re-sults show that,in numerical simulation,both two kinds of boundary conditions,combined with adapted model constants and wall conditions,are able to construct horizontally homogenous ABL,which basically satisfy the conditions required by the code,but each has its own applicable scope.Based on these works,the relation between model constant C 1 ,turbulent dissipation rateε and the numerical simulation results was studied,and a method to improve the results by modi-fying model constant andε was introduced.