Research On Hydrodynamic Numerical System Development And Application

At present,numerical simulation has been widely applied to engineering for the study of flow characteristic,utilization of ocean and river and other relevant issues,due to low cost,short cycle,high efficiency and facility for modification parameters.Modeling,numerical calculation method and flow field analysis are three essential aspects for hydrodynamic studies based on numerical model.In this study,the issue relevant to hydrodynamic simulation mentioned above has been discussed in detail,and comprehensive system of hydrodynamic simulation has been implemented.It makes up the insufficiency of the integration of the hydrodynamic numerical simulation system in China,the lack of friendly interface and the lack of visualization.The major contents of this study are summarized as follows:(1)High efficient and reliable automation modeling algorithm for hydrodynamic numerical simulation is inmplemented.The DXF File is adopted as the intermediary interaction to AutoCAD for study area reading.For river network,pipeline model(1D),interval function is employed for meshing,so mesh is relatively uniform.Smart cross-section interpolation algorithm is designed to make cross-section input conveniently and accurately.For 2D and 3D model,Delaunay algorithm based on Bowyer-Watson incremental inserting algorithm is employed for meshing,which makes mesh division more flexible.Secondary development based on Google earth is achieved for topography download which can be an assistant mean for topography data acquisition.Kriging spatial interpolation is adopted to interpolate fundamental data,which can keep the stability of the relief terrain interpolation in practical applications.(2)It is elaborated that hydrodynamic simulation model integrated in the Hydroinfo platform,including river network model,2D model,3D model,coupling model and transport model.It is showed that the models can deal with related problems of numerical simulation of river,ocean and other flow according to the actual demand.(3)Based on WPF,3D visualization platform is established.Form the basic steps for 3D graph drawing,it is implemented that fundamental graphic visualization such as 3D boundary,3D topography,3D meshwork and so on.And on this basis,3D surface flow field visualization,multiple cross-section flow field visualization,scalar field visualization and 3D vector animation visualization are implemented.Surface flow field visualization can track free surface,so that the progress of water level can be visualized more intuitionally and visually.Additionally,density control for flow field visualization is more flexible because of the employment of interpolation.Multiple cross-section flow placed into original computational domain has been proposed to reflecting the vertical characteristics of flow field more efficiently.Particle trajectory tracker is expressed by tracing particle and identification point path line which is supported by high-efficiency particle tracing algorithm.Smooth animation simulation is accomplished.(4)The coupling hydrodynamic numerical simulation functions of WEBGIS platform is developed.Hydrodynamic is capsulated in the EXE file waiting to be called.Map service is developed by Silverlight from the bottom,without any other software as the second develop interface.The layered management of vector map layer.Dynamic particle tracking algorithm for 1D model and field flow visualization for 2D model are developed,the efficient animation simulation is implemented and splash screen problem with animation is solved by asynchronous refresh.(5)The development progress of the Hydroinfo is discussed in detail.On the basis of requirement analysis,function architecture and process of the solution are designed and system framework is put forword.Data base design is illustrated in detail including entity design and relation design.And function modules design and development implement.The method of visualization during calculation is raised.From generally visualization compute progress extended to global field visualization.Graphical user interface is designed followed by typical Windows style,so the interface is friendly,easy and legible.(6)Taking Pearl River flow simulation,Oujing estuary tide simulation and sea-ice growth and decay model of Bohai Sea as examples to verification the efficiency and applicability of Hydroinfo in dealing with practical engineering problems.It is illustrated that Hydroinfo can comprehensively involve in all the aspects of the simulation,integration of modeling,calculation and post-progress.Hydroinfo integrated 1D model,2D model,3D model,coupling model and transport model and so on.According to customer's selection,guide to different modeling module,numerical calculation module and analysis module.Better interaction guided model setting interface makes modeling work become easier to do.Due to visualization in computational process,it becomes more controlled.Customer can analysis field flow at any time,so that they can modification compute parameter in time,which improves the work efficiency.Post-process module not only full fish 2D vector and scalar field visualization,but also 3D visualization.Because of various types of integrated mudels,Hydroinfo has a wide scope of application and it not limited by spatial scale.