【作者】 周淑芹；

【导师】 刘亚辉； 尹崇清；

【作者基本信息】 重庆交通大学 ， 水工结构工程， 2008， 硕士

【摘要】 引航道口门区由于斜向水流的作用,横流和回流使航行船舶产生横漂和扭转,影响通航;本文采用数值计算、结合物理模型试验,对引航道口门区通航水流条件进行研究,得到如下结论:1)本文以水深平均二维水流方程理论基础,采用FEM方法对方程进行数值计算,用该数模对水槽概化模型进行数值模拟,通过计算成果与物模试验数据对比分析,得到误差在±0.05m/s以内,满足精度要求。该数学模型的特点:一是适合模拟范围长,边界条件相对复杂的河流;二是计算速度快、精度高。2)在用二维有限元方法数值模拟实际工程实验中;揭示了在不同枢纽运行工况下,下引航道口门区水流条件的特点;同时提出了改善措施。3)实验证明,物理试验结果与数值计算结果基本吻合;物理模型有效的验证了该数学模型在实际工程中应用的价值,建议在宽浅河流的数值模拟中推广应用。更多还原

【Abstract】 This paper study on navigation in approach channel . when dynamic water meet static water ,there are spiral flow and spiral vortex in approach channel.In this report, in consulting a great deal of domestic and international literature, the contents are studied on the way of numerical calculation, experimental model test by analogical analysing and summarizing the other similar engineering research achievements. We get plenty of results by analyzing. But the main results include:1) On the basis of the tow-dimensional shallow water equation and the tow-dimension depth averaged finite element hydrodynamic numerical model. The model computes horizontal velocity components for subcritical free-surface tow-dimensional flow fields. The equation are solved by the finite element method using the Galerkin Method of weighted residuals. Intergration in space is performed by Gaussian .Intergration Derivatives in time are replace by non linear finite difference approximation. The solvtion is fully implicit and the set of simulataneous equation is solved by Newton-Raphson non liner interation scheme.2) By numerical simulation and experimental model test, this paper gives an exposition to the flow conditions at entrance area and its influence to navigation. Flood- discharging has influence on the navigation of downstream approach channel, and espe- cially oblique flow formed in the downstream approach entrance and connect region d- uring flood-discharging influenced the navigation greatly. By the characteristic values of the oblique flows and characteristic values of the ship sailing in oblique flows, the navi- gation flow condition are analyzed effectly. The influence caused by oblique flow will be redued through modifying the navigation.3) By the physical model on the scale of 1:100 and numerical simulation, various arrangements of downstream approach channel of the Shi Hu Tang are studied. Navigable flow conditions in the channel, around the channel entrance and at the channel connecting section under various plans are analyed from the aspects of flood di- scharing. It’s shown from the result that the revisions in layouts is the optimum one.更多还原