河口三维非线性Galerkin谱模型

A THR EE-DIM E NSIONA L NONLINEAR GALERKIN SPECTRUM MODEL FOR ESTUARIES

作者应用Galerkin谱方法建立了河口三维非线性数值模型,研究了一个理想河口在迳流和潮汐作用下水体的运动及混合。模型中选用了经验湍模型,并选取了一个特殊的基函数系,使自由表面边界条件得以严格的满足,改进了对垂直结构拟合的收敛性。

A three-dimensional nonlinear numerical estuarine model is presented in the paper, using the Ga le r r in-spectrum method. The model is applied to describe the currents and mixing processes in a simple estuary, driven by runoff and tide. The σ-stretching and an experimental turbulence model is used. The convergence near the surface is increased by chosing a special basis set which satisfies the surfaty houndar conditions exactly.