In addition to the built-in GUI, HAMMER also supports user customization with Bentley’s WaterObjects.NET. HAMMER provides a graphical user interface (GUI) for model creation, data management, model setup and run, and post-processing. Sabbagh-Yazdi et.al (2007) discussed the strength and weakness of each method.īentley’s HAMMER software ( Bentley 2015) can model almost all transient sources, surge mitigation devices, and their associated operations. Numeric solutions have been proposed, including finite difference, finite volume, finite element, the method of characteristics (MOC), and the wave plan method (WM) ( Wood et al. Hydraulic transients in a closed pipeline system are governed by one-dimensional continuity and momentum equations. For the design of a proposed feedermain in a water distribution system or a forcemain in a sewer system, it is therefore crucial to analyse the impact of transient pressures to ensure that the integrity of the pipeline is not compromised. surge valves or tanks, or air valves) are often required to mitigate destructive transient forces. Factors such as the elasticity of pipe boundaries, fluid compressibility, and pipe wall and minor frictions can dampen the generated transient pressures to a limited extent. The consequences of transient phenomena could vary from vibration noise near the pumping station to pipeline breakage, damage to pumping stations, or backflow and the intrusion of dirty water ( Boulos et al.
As a result, significant pressure fluctuations around the initial steady state can be observed. These changes can be caused by pump stop, pump start (pipe filling), rapid inline valve closure, pipe burst, rapid demand change, and other factors. Hydraulic transient phenomena in closed pipeline systems occur when flow experiences sudden changes. The tool identified sensitive parameters of the case study model and achieved much better accuracy than the initial model setup after calibration.
The tool was tested and applied in a transient study of a sewer system pumping station upgrade. The tool also enables calibration for field testing pressures. The tool supports sensitivity analysis for the Hazen–Williams c coefficient for a steady state model, and for the inertia of pump plus motor and pipe wave speed for a transient model. The tool was created by coupling Bentley WaterObjects.NET, programming language C#, and genetic library in AForge.NET. An in-house tool was developed to enable efficient sensitivity analysis and calibration study for Bentley’s HAMMER steady state and transient models.
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