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Ding Dao-yang Nanjing Hydraulic Research Institute Nanjing P.R.ChinaPhilip L.-F.Liu School of Civil Environmental Engineering Cornell University Ithaca New York USA 《水动力学研究与进展(B辑)》1993,(1)
An operator-splitting algorithm for the three-dimensional convection-diffusion equa-tion is presented.The flow region is discretized into tetrahedronal elements which are fixed in time.The transport equation is split into two successive initial value problems:a pure convection problemand a pure diffusion problem.For the pure convection problem,solutions are found by the method ofcharacteristiCS.The solution algorithm involves tracing the characteristic lines backwards in time froma vertex of an element to an interior point.A cubic polynomial is used to interpolate the concentrationand its derivatives within each element.For the diffusion problem,an explicit finite element algorithmis employed.Numerical examples are given which agree well with the analytical solutions. 相似文献
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用于静态稳定预防控制的新灵敏度分析法 总被引:7,自引:5,他引:7
在研究多重复杂故障对于系统静态非线性影响的连续潮流模型和工具的基础上,提出了一种新的用于电力系统静态稳定预防控制的灵敏度分析方法。一些严重的多重复杂故障会造成电力系统立即失去静态稳定。这些失稳故障都有一个对应于故障参数空间的虚拟的静态稳定临界点。文中提出了一种新的评价失稳故障严重程度的故障失稳裕度指标,并提出了基于这一指标的灵敏度分析方法,给出了各种控制对于故障参数的灵敏度。同时给出了一种基于控制灵敏度和控制类型优先级的预防控制策略。通过一个3000节点的实际系统的计算表明,文中所提出的灵敏度方法是有效的,适合于大型实际系统的静态稳定预防控制。 相似文献
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