网格尺寸对Delft3D有限元水流场仿真精度影响的分析

Influence analysis of the mesh size on the precision of flow field simulation of the the Delft3D finite element

针对有限元水流场仿真中有效地选择网格尺寸、平衡计算精度和计算成本的问题,采用在网格形状、边界激励类型、边界激励量大小等因素相同的条件下,输入不同的网格尺寸分析了仿真的精度误差的方法,建立了海南某港的Delft3D-FLOW模块水流场仿真模型。研究结果表明:仿真计算的绝对误差基本呈非线性关系,相同条件下靠近岸线的位置仿真误差大于海域中间的位置仿真误差。

In order to select the mesh size efficiently,and balance the calculation precision and computational expense in the simulation of finite element flow field,a Delft3D-FLOW field simulation model at a port of Hainan was established. The precision error of the simulation was analyzed by inputting various mesh sizes with constant mesh shapes,types and values of boundary incentive. The analysis result shows that,the absolute simulation errors are non-linear,and the simulation error near the shoreline is greater than that in the middle of the ocean area under the same simulation conditions.