墩柱壅水数值模拟研究

Study on Numerical Simulation Parameters of Pier Backwater

紊动黏性系数是墩柱壅水数值模拟中的重要参数,在现有利用水动力数学模型分析墩柱壅水的研究中,对紊动黏性系数取值规律的研究仍然不足。首先设计壅水物理模型试验实测墩柱壅水,然后采用二维水动力数学模型模拟墩柱壅水,分析几种紊动黏性系数取值方法对壅水高度的影响及敏感性。结果表明,E取常值,按Peclet数取值,按Smagorinsky方程取值,均可以成功进行壅水计算,但3种紊动黏性系数取值方法与壅水高度的作用规律各不相同。

Eddy viscosity is an important parameter in the numerical simulation of pier backwater. In the existing research of numerical simulation on pier backwater, the study on law and method of eddy viscosity is still insufficient. First, design a physical model to measure the backwater of pile. Second, study on influence and sensitivity between eddy viscosity and backwater height by building a two-dimensional hydrodynamic mathematical model of pile backwater. The results show that these methods can successfully perform backwater calculations, but different value methods of eddy viscosity have different effects on the backwater height.