Numerical investigation of a turbulent hydraulic jump: Interface statistics and air entrainment

ORAL

Abstract

The objective of this study is to develop an understanding of formation of bubbles due to turbulence/interface interactions and nonlinear surface wave phenomena. As a model problem a statistically stationary turbulent hydraulic jump has been considered. Turbulent hydraulic jump with an inflow Froude number of 2 and Reynolds number of 88000--based on inflow height--has been numerically simulated. Based on typical air- water systems, a density ratio of 831 has been selected for our calculations. A refined level-set method is employed to track the detailed dynamics of the interface evolution. Comparison of flow statistics with experimental results of Murzyn et al. (Int. J. Multiphase Flow, 2005) will be presented. The probability density function of principal curvatures of the air- water interface and curvature distribution patterns in the chaotic regions are investigated. The importance of liquid impact events in bubble generation will be discussed.

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Authors

  • Milad Mortazavi

    Graduate student at Stanford University

  • Dokyun Kim

    Post-doctoral fellow at Stanford University, CTR, Stanford University

  • Ali Mani

    Post-doctoral fellow at MIT, Chemical Engineering, MIT, Cambridge MA, U.S.A.

  • Parviz Moin

    Center for Turbulence Research, Stanford University, Stanford University, Stanford Univ., Franklin and Caroline Johnson Professor of Mechanical Engineering, Stanford University, CTR, Stanford University, Center for Turbulence Research (CTR), Stanford University