Author(s): Antonio Muralha; Jose F. Melo; Helena M. Ramos

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Abstract: Complex high-velocity water flow analyses have been mainly experimentally conducted. Numerical simulations of complex flows are increasingly becoming possible, although thorough validations and calibrations are still required. In recent studies at LNEC, experimental data of dynamic pressures experimentally obtained were used to validate results from numerical simulations of a high-velocity water jet plunging into a pool. Two different OpenFOAM solvers were used: interFoam, more commonly used in free surface flows; and twoPhaseEulerFoam. An assessment was conducted to verify which of these solvers better performs in simulating the jet diffusion and energy dissipation in the plunge pool. Mean pressure, velocity and the air concentration results evidenced that, using experimental results as a reference, the twoPhaseEulerFoam, an Euler-Euler type solver, performs better than interFoam, a VOF solver. This study allowed to conclude that twoPhaseEulerFoam is an adequate option for simulating high-velocity diffusing water jets when the aim is the assessment of mean dynamic pressures on the plunge pool floor.

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Year: 2024