Experimental and Numerical Analysis of Two-Phase Flows in Plunge Pools

J M Carrillo,F Marco,L G Castillo,J T García

doi:10.1061/(asce)hy.1943-7900.0001763

J M Carrillo, F Marco + Show 2 more

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https://doi.org/10.1061/(asce)hy.1943-7900.0001763

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Abstract

AbstractThe current capacity of many spillways may be insufficient due to the increase in flood flows as a result of climate change. In those cases, the dam may be overtopped, generating new loadin...

Highlights

In the last years, the increase in the magnitude of design floods due to climate change, the review of hydrologic data records, and/or the assumption of more demanding design methodologies [e.g., by adopting the probable maximum flood (PMF)] has promoted the re-evaluation of spillways capacity and the operational scenarios for large dams around the world
In the quasi-unidirectional flow region of the submerged hydraulic jump, laboratory velocities have been compared with the numerical simulations carried out using ANSYS CFX
The laboratory results tend to differ from those obtained with the numerical models and with the nondimensional distribution obtained by Castillo et al (2017) in submerged hydraulic jumps downstream of free-falling jets

Summary

Introduction

The increase in the magnitude of design floods due to climate change, the review of hydrologic data records, and/or the assumption of more demanding design methodologies [e.g., by adopting the probable maximum flood (PMF)] has promoted the re-evaluation of spillways capacity and the operational scenarios for large dams around the world. The choice of plunge pool type is usually a technical-economic decision between a deep and uncoated stilling basin and a shallow stilling basin with a lining. The submerged hydraulic jump downstream of the impingement point of nappe flow is a particular case offering scant studies (Carrillo et al 2018). A nappe flow has been considered with a falling distance H 1⁄4 2.00 m and theoretical impingement jet velocity Vj 1⁄4 5.90 m=s [Fig. 1(b)]. In the quasi-unidirectional flow region of the submerged hydraulic jump, laboratory velocities have been compared with the numerical simulations carried out using ANSYS CFX (version 18.0). The combination of experimental and numerical methodologies enabled the Sauter mean bubble diameter in the entire submerged hydraulic jump to be determined. The bubble diameter results were validated against images recorded with a high-speed camera

Experimental Setup

Findings

Conclusions