摘要
石油污染是当今严重的全球性环境问题之一,已受到愈来愈多的关注。本文以通用的应力—通量代数湍流模型为基础,针对油—水两相流动体系的特点,提出了油污染预报全场模拟的湍浮力流动应力—通量代数模型。模型不仅在控制方程中计及了密度变化,而且在应力和质量通量的代数关系中含有浮力项,也就是使各向不同性的涡粘性系数和湍流扩散系数与当地Richardson数建立起函数关系,从而自动地计及了浮力对紊动的影响。结果表明,模型的模拟效果非常满意。
Oil pollution is one of the most serious problems of worldwide environment nowadays and it has raised more and more attention. Based on the universal algebraic stress-flux model of turbulent flow, taking the characters of oil-water two-phase flows into account, the algebraic stress-flux model of turbulent buoyant flows for whole field simulation of oil pollution is developed in the second part of the paper. In the control equations of the model density variation is considered. The algebraic relations for the stresses and the flux contain buoyancy terms, leading effectively to non-isotropic eddy viscosities and diffusivities as the function of local Richardson number. The directional effects of buoyancy on turbulence are automatically accounted in the model, It has shown that the results of numerical simulation are satisfactory.
关键词
石油污染
模拟
数学模型
prediction of oil pollution, turbulent buoyant flows, whole field simulation, algebraic stress-flux model
