【作者】 张华文；

【导师】 陈刚；

【作者基本信息】 西安理工大学 ， 水力学及河流动力学， 2005， 硕士

【摘要】 随着计算机及数值计算技术的发展,数值模拟技术已获得普遍认同。它的应用范围越来越广泛,并成为一种研究流场的基本手段。 本论文是围绕复杂区域紊流流动的计算展开,实现了双洞式溢洪洞紊流场的数值模拟。具体工作包括: (1) 通过对紊流数学模型的回顾与评述,结合研究对象的特点以及现有条件,选用标准κ-ε紊流模型作为本文计算模型。建立通用坐标系下三维紊流流动的控制方程。 (2) 采用非结构化网格生成技术处理复杂边界。根据双洞式溢洪洞的水流特点,完成了网格生成。 (3) 利用有限体积法对控制方程进行离散:推导得出压力修正方程;采用多重网格法和点隐式高斯—塞德尔迭代方法相结合的办法求解离散所得代数方程组,并给出了求解步骤。 (4) 实现了甘肃九甸峡工程双洞式溢洪洞三维紊流场的数值模拟。在结合模型试验资料基础上,对双洞式溢洪洞沿程各个断面的流速、压力、紊动能以及耗散率西安理工大学硕士学位论文等水力参数的计算结果进行了分析。 (5)在原设计方案数值计算结果的基础上,针对原方案设计中wES段存在负压的问题,提出加肥WES段体型的改进方案。关键词:双洞式溢洪洞k一‘紊流模型非结构化网格SIMPLEc算法体型优化更多还原

【Abstract】 In recent decade years, with the development of the numerical simulation technology, the application domain of it is becoming broader and broader. Now the numerical simulation technology is accepted and regarded as a kind of fundamental means for the research in flow fields.The paper is around complicated district turbulent flow. Numerical simulation of flow field in a complex spillway tunnel is achieved in the paper. The concrete work includes:(1) Turbulent models are reviewed briefly. In view of hydraulics characteristics, standard two equations k-E model is adopted. Governing equations for three-dimensional turbulent flow are set up in general coordinates.(2) Unstructured grid generation is adopted in complicated geometry. According to the water current characteristics of the spillway tunnel, its grid is generated.(3) Finite volume method is used to discrete the governing equations.Pressure correction equations are deduced. Multi-grid methods and Gauss-Seidel methods are adopted to obtain the solution of the equations.(4) Numerical simulation of Jiudianxia spillway tunnel is performed and the results are analyzed by being compared with the experimental observations.(5) Problems are ascertained in original design, and an improved design is put forward.更多还原