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首页> 外文期刊>Journal of Hydroinformatics >Extending the global gradient algorithm to unsteady flow extended period simulations of water distribution systems
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Extending the global gradient algorithm to unsteady flow extended period simulations of water distribution systems

机译：将全局梯度算法扩展到配水系统的非恒定流扩展周期模拟

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This paper introduces an extension of the Global Gradient Algorithm (GGA) to directly solvenunsteady flow problems arising from the presence of variable head water storage devices, suchnas tanks, in Extended Period Simulations (EPS) of looped water distribution networks (WDN). Suchna modification of the original algorithm was motivated by the need to overcome oscillations andninstabilities reported by several users of EPANET, a worldwide available package, which uses thenGGA to solve the looped WDN equations. The set of partial differential equations describing thentime and space behaviour of a water distribution system is here presented. It is shown hownan unsteady flow GGA can be derived by simple modifications of the original steady-state GGA.nThe performances of the new algorithm, referred to as EPS-GGA, are compared with the resultsnprovided by EPANET on an extremely simplified example, the solution of which is qualitativelynknown. As opposed to EPANET which shows significant instabilities, the EPS-GGA is stable underna wide variety of increasing integration time intervals.
机译：本文介绍了全局梯度算法（GGA）的扩展，以直接解决在循环水分配网络（WDN）的扩展周期模拟（EPS）中存在可变水头储水装置（例如纳罐）而引起的不稳定流量问题。对原始算法进行这样的修改的动机是需要克服EPANET的几个用户报告的振荡和不稳定性，EPANET是全球可用的软件包，使用NETGA来求解循环的WDN方程。这里介绍了描述水分配系统的时空行为的一组偏微分方程。它显示了如何通过对原始稳态GGA的简单修改来导出非稳态流量GGA。n将这种新算法EPS-GGA的性能与EPANET在一个极其简化的示例（解决方案）上的结果进行了比较。在质上是未知的。与EPANET表现出明显的不稳定性相比，EPS-GGA在各种增加的积分时间间隔内均保持稳定。

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