潮流物质输运过程数值模拟中的误差传递、放大及修正

Error transfer, magnification and modification in numerical simulation of multi-physical process

用二维潮流物质输运模型模拟河口流动的计算中,河道中会发生非物理的物质含量增高的现象。经分析发现,水流和物质输运子系统间,以ADI方法计算水流场而产生的可允许水位误差,造成物质输运模拟时水流量不严格守恒,导致物质输运计算误差积累放大。提出水位水量平衡修正模型,解决了子系统间计算模拟误差传递放大问题,避免了二维潮流物质输运模拟计算中非物理的物质含量增高现象发生。

Local non-physical solute heightening phenomena is found in the numerical simulation for the complex riverway when 2D tide and solute transport model is used. It is analyzed seriously and found that the evor is magnified because the water flux is not conserved strictly for the very small permitted error in water level calculated by the ADI method in the 2D tidal model. A water flux balance model is suggested in this paper and the error magnification is eliminated, thus the local solute heightening phenomena is disappeared.