Abstract
AbstractThis paper deals with the evolution of structural responses accompanying water hammer in quasi-rigid straight pipelines with emphasis on the effect of the support rigidity. The coupled discrete vapour cavity model (DVCM) is used to simulate axial stress and axial displacement of the pipe in presence of column separation. Transient is caused by a fast-downstream valve closure. The method of characteristics (MOC) with wave-speed adjustment scheme is used in calculation. The numerical results obtained for rigid and viscoelastic supports are performed and compared. The cavity collapse involves greater stress peak at the valve with rigid support, but the stress spikes are reduced in case of viscoelastic support. The axial displacement is more important for this last case because of junction coupling effect. The results obtained are assumed to be important in hydraulic engineering.KeywordsWater hammerColumn separationAxial vibrationFluid-structure interaction (FSI)Poisson coupling
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