【摘要】 本文根据在床底人为设置窄缝的设想,对二维不恒定流计算中由于水位变动而造成的计算域相应变动的问题进行了处理,结合破开算子法,提出了具有动边界功能的计算二维不恒定流动的一种新模式。该模式解决了用固定边界模拟变动边界的问题,并具有良好的稳定性和计算精度,计算实例表明:本模型与一般固定边界的模型相比,所增加的计算量不多,而大大改善了滩地水流的模拟。更多还原

【Abstract】 This paper describes a slot technique dealing with 2-D unsteady flow within a transient boundary, for example, the flow over a tidal flat during a tidal cycle. Two groups of imaginary slots are placed perpendicular to each other on the shore to transform the problem to that of fixed boundaries By combining with the operator splitting method, a new numerical model for 2-D flow is developed, which significantly simplifies the simulation of moving boundaries. The CPU time for the new computation only increases a little, but the computational result indicates that the flow pattern near the beaches is greatly improved. A good stability and a satisfactory accuracy are also achieved.更多还原