考虑流固耦合效应的压力管道断流弥合水锤数值模拟OA

Water hammer with column separation represents one of the most hazardous transient flow problem in pres-surized water conveyance systems.The classical discrete gas cavity model(DGCM),which neglects fluid-structure interaction(FSI),often leads to an advance in pressure wave phase and deviations in peak pressure prediction.To address this issue,this study introduces FSI into the classical DGCM and develops a discrete gas cavity model coupled with four-equation axial model(DGCM-4EAM),establishing a numerical solution framework based on the method of characteristics.Based on a typical experimental case,the effects of grid resolution and rational wave-speed ratio on prediction accuracy were systematically investigated.The results indicate that grid resolution significantly affects the peak pressure and numerical stability;an overly coarse grid leads to peak underestimation and spurious oscillations.The rational wave-speed ratio mainly affects the pressure peak by altering the FSI magnitude through adjustment of pipe material density,but has limited influence on the overall waveform and phase.Compared with the classical DGCM,the proposed model reduces the mean absolute error at the valve and pipe midpoint by up to 50％,yields better agreement in pressure wave phase with experimental data,and exhibits enhanced numerical conver-gence and stability.It also predicts an overall reduction in cavity volume,suggesting that FSI suppresses cavity devel-opment.The results demonstrate that incorporating FSI significantly enhances the prediction accuracy of water hammer with column separation,providing a more reliable numerical tool for transient flow analysis and water hammer protection in pressurized pipeline systems.