一类涡粘性下湍流底边界层的流场特征

Flow Field Characteristics of Turbulent Bottom Boundary Layer Under an Eddy Viscosity

利用涡粘性υ=az(1-z/d)~2模式,得出湍流底边界层的速度场和其他动力参数的解析解,数值结果表明:底边界层的速度场和剪应力受平均流的角频率和地球自转影响比较大,而对底边界层顶部粗糙度不敏感.并得到了和M2分潮观测数据拟合良好的速度分布图.

An analytical solutions of the velocity distribution and other dynamic parameters in the turbulent bottom boundary layer( BBL) were derived with an eddy viscosity of a new parameter form υ = az(1-z/d)~2.The numerical results indicate that the velocity field and shear stress in the BBL are influenced greatly by the angular frequency ω of the mean flow and the Coriolis parameter f. However,the velocity is insensitive to the roughness at the top of the BBL. Meanwhile,the velocity distribution in the theory model is fitted well with the observed data of M2 tide.