The design and construction of a liquid damper for full-scale use in high-rise buildings

Abstract

To store surface water for various uses, the design of high dams and spillways has increased significantly. A review of the references indicates that in recent years, numerous studies have been conducted on the phenomenon of cavitation, ways to prevent its occurrence, and reducing the damages caused by this phenomenon on hydraulic and numerical models of free spillways. Numerical modeling of flow in pressurized tunnel spillways with aeration structures and studies related to the two-phase flow of water and air in these spillways are very few. Therefore, further understanding and recognition of the pressure fields and flow velocity near the aeration structure of pressurized tunnel spillways and the effect of the geometry of the aeration ramp and different aeration percentages on the flow require further studies. In this research, numerical simulation of the flow passing over the aeration ramp installed at the bottom of the pressurized duct has been studied. First, a numerical analysis of the hydraulic characteristics of the flow in the non-aerated state, such as the length of the rotation zone created downstream of the ramp, the intensity of turbulence, the pressure coefficients at the bottom of the duct, and the velocity and pressure profiles at different sections before and after the ramp, is carried out. Then, the effect of air entry in different percentages on various flow parameters, especially velocity profiles and pressure coefficients, is studied. The overall goal of this research is to correctly understand the hydraulic phenomena occurring in the two-phase flow of water and air near the tunnel overflow aerator.