浓度及温度场问题三维数值模拟及应用

研究温度和污染物的扩散规律,对于健康河流具有十分重要的意义。在排水口附近,温度和污染物的扩散具有很强的三维性。在已开发的三维紊流水动力模型基础上,研制了浓度及温度场三维数学模型。在模型中,空度用来处理不规则边界,VOF用来处理自由面。另外,模型还采用了k-ε紊流模型和壁面函数。利用建立的模型,对水槽和天然的排水口附近的水位、流场、紊动能及其扩散率、温度场和浓度场的分布规律等进行了模拟和研究。通过研究进一步认识了排水口局部三维水流运动规律,浓度和温度扩散规律及分布。

Concentration and Temperature Field: Three-dimensional Numerical Simulation and Its Application

Research on warm water and pollutant diffusion is of great significance to the health of river ecosystem. The convection and diffusion of warm water and pollutants in the adjacent of drainage outlet are strongly three-dimensional. In this research, a mathematical model of temperature and concentration field is developed based on 3-D turbulent flow hydrodynamic model. In the modeling, porosity is used to deal with irregular boundary, and VOF method is used to simulate free surface. In addition, the turbulent model and the Wall Function are used in the modeling. This model is applied to simulate water level, flow field, turbulent kinetic energy and its dissipation rate, and diffusion regularity of temperature and concentration field around the drainage outlet. This model could well simulate the stratification of concentration and temperature in vertical direction.