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首页> 外文期刊>Journal of Hydroinformatics >The extension of EPANET source code to simulate unsteady flow in water distribution networks with variable head tanks
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The extension of EPANET source code to simulate unsteady flow in water distribution networks with variable head tanks

机译：EPANET源代码的扩展，以模拟具有可变水箱的配水网络中的非恒定流动

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摘要

This paper describes the modifications applied to EPANET, a public-domain water distribution system modelling software package, that does not correctly compute the hydraulics of a water distribution network (WDN) with variable tank heads in (slow) unsteady flow conditions. Firstly the methodology adopted to extend the Global Gradient Algorithm (GGA) implemented in the original EPANET source code to the Extended Period Simulation-GGA (EPS-GGA) is described. Then the convergence and stability conditions of the theta method, used for the discretisation in time of the set of differential equations describing the hydraulic behaviour of a WDN, are discussed. The reasons for EPS-GGA numerical stability are demonstrated and a fully implicit discretisation of differential equations (i.e. theta = 1) is suggested as the optimal choice as implicitly proposed in Giustolisi et al. but without theoretical justification. Both the modified and original versions of EPANET are applied to a particularly severe test case of a WDN. Moreover, the procedures for the correct numerical representation of the tanks' maximum and minimum level boundary conditions are developed and compared with previously proposed procedures. The modified version of EPANET source code does not show the significant instabilities which are evident in the original version, nor the lack of consistency due to the improper maximum and minimum level boundary condition schematisations formerly proposed in the scientific literature.
机译：本文介绍了应用于EPANET（公共领域水分配系统建模软件包）的修改，该软件无法在（缓慢）不稳定流量条件下正确计算具有可变水箱盖的水分配网络（WDN）的液压。首先，介绍了将原始EPANET源代码中实现的全局梯度算法（GGA）扩展为扩展周期仿真GGA（EPS-GGA）所采用的方法。然后讨论了用于描述WDN水力行为的一组微分方程随时间离散的theta方法的收敛性和稳定性条件。证明了EPS-GGA数值稳定性的原因，并建议根据Giustolisi等人的建议隐式完全离散化微分方程（即theta = 1）作为最佳选择。但没有理论依据。 EPANET的修改版和原始版都适用于WDN的特别严格的测试案例。此外，还开发了用于正确数值表示油箱最大和最小液位边界条件的程序，并将其与先前提出的程序进行了比较。修改版的EPANET源代码没有显示出原始版本中明显的显着不稳定性，也没有显示出由于先前科学文献中提出的最大和最小级别边界条件图示说明而导致的不一致性。

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  • 来源
    《Journal of Hydroinformatics》 |2012年第4期|p.960-973|共14页
  • 作者

    Diego Avesani; Maurizio Righetti; Davide Righetti; Paolo Bertola;

  • 作者单位

    Department of Civil and Environmental Engineering, via Mesiano 77, I-38123 Trento, Italy;

    Department of Civil and Environmental Engineering, via Mesiano 77, I-38123 Trento, Italy;

    Department of Civil and Environmental Engineering, via Mesiano 77, I-38123 Trento, Italy;

    Department of Civil and Environmental Engineering, via Mesiano 77, I-38123 Trento, Italy;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    EPANET; tanks; unsteady flow; water distribution network;

    机译：EPANET;坦克不稳定流量供水网络;

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