Numerical simulation of water hammer characteristics in the closing process of electric globe valve based on CFD

Electric globe valves in automatic water‑injection drainage systems often have to close in less than 1 second. This fast closing can cause strong water‑hammer effects, which produce vibration and noise. Usually engineers analyze the problem with a one‑dimensional Method of Characteristics (MOC). MOC does not capture the three‑dimensional flow patterns or the short‑term changes inside the fluid. This project uses Computational Fluid Dynamics (CFD) with Ansys Fluent to simulate the transient flow field while the valve closes. By modeling the moving mesh of the valve plug, the simulation tracks how pressure spikes and velocity fields evolve in space and time. The study examines how inlet pressure, valve‑closing speed, and the

specific motion law of the plug affect the magnitude of the water‑hammer phenomenon. The results show that selecting an optimal motion law and closing velocity can greatly reduce the amplitude of pressure pulsations. Because the original source provides no experimental validation data, the work does not include physical testing. The scope is limited to numerical modeling and a parametric sensitivity analysis.

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