20.500.12556/RUL-170657 Analytical, numerical 1D and 3D water hammer investigations in a simple pipeline apparatus Analitične, numerične 1D in 3D raziskave vodnega udara v enostavnem preizkusnem cevovodu This paper deals with the analytical and numerical simulation of a water hammer in the reservoir-pipeline-valve (RPV) system. An analytical solution of the water hammer equations with unsteady friction term was derived for transient laminar pipe flow in a RPV system. For simulation of an arbitrary flow situation a number of one-dimensional (1D) numerical methods have been developed. The physically based method of characteristics proved to be computationally efficient and can handle complex boundary conditions. The accuracy of the 1D numerical model is increased by introducing terms that take into account 3D effects (example of an unsteady skin friction). The 3D model predicts these influences directly and represents an excellent tool for researching multidimensional properties of fluids (numerical laboratory). Calculation results based on 1D and 3D numerical models are in good agreement with results of measurements taking into account adequate prediction and modelling of influential physical parameters during laminar and low-Reynolds number turbulent water hammer events. Quantitative comparison analysis yields up to 2 % difference in maximum head at the valve and up to 5 % relative difference in pressure head drop at the midpoint of the pipeline monitored over the first four positive pressure pulses. pipeline water hammer analytical solution method of characteristics computational fluid dynamics unsteady skin friction cevovod vodni udar analitična rešitev metoda karakteristik računalniška dinamika tekočin nestalno stensko trenje true false true Angleški jezik Slovenski jezik Članek v reviji 2025-07-11 12:38:52 2025-07-11 12:39:00 2025-07-16 04:03:01 0000-00-00 00:00:00 2025 0 0 Str. 149-156 no. 5/6 Vol. 71 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.22:621.64 0039-2480 10.5545/sv-jme.2024.1179 242283011 Bergant_..._Analytical.pdf Bergant_..._Analytical.pdf 1 32E03A2F74D35A792C2EF6EFAAA434BA b40cc34e32c0ebf1a82bddfed9361710026e58a035f19cce0be97a4c36154a76 a25994e2-6144-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=212930 https://www.sv-jme.eu/article/exact-numerical-1d-and-3d-water-hammer-investigations-in-a-simple-pipeline-apparatus/ 1 58aab247-5e41-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=212697 Fakulteta za strojništvo Strojniški vestnik 0 0 0