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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

3D NUMERICAL AND EXPERIMENTAL SIMULATION OF SPRAY-CLOUD FORMATION DUW TO WAVE-BODY INTERACTIONS

Armin Bodaghkhani
The Memorial University of Newfoundland, Department of Mechanical Engineering, St. John's, NL, Canada

Yuri S. Muzychka
Department of Mechanical Engineering, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, A1B 3X5, Canada

Bruce Colbourne
The Memorial University of Newfoundland, Department of Ocean and Naval Architectural Engineering, St. John's, NL, Canada

Abstract

Numerical simulation of strongly nonlinear wave interactions with a solid object is performed based on coupled Volume of Fluid (VOF) and Level Set (LS) methods. A Cartesian-grid method is used to model immersed solid boundaries with constant grid spacing for simplicity and lower storage requirements. VOF and LS methods were used to capture the fluid behavior at the free-surface interface, including the wave impact, water-sheet breakup, and spray formation after impact. The numerical scheme is implemented using parallel computing due to the high CPU and memory requirements of this simulation. A laboratory experiment was carried out in a tow tank interaction between a wave and a fixed flat-shaped plate model was investigated. Different wave-phase velocities are implemented in both the experimental and numerical modeling to study the behavior of water-sheet breakup and spray after the wave impact. The Bubble Image Velocimetry (BIV) method was used to capture the aerated impact area in the physical experiment. The magnitudes of the water-sheet and spray-cloud velocities (droplet velocities) are measured using high-speed video and image processing techniques. The ability to model and resolve complex free-surface behavior, the speed of the numerical algorithm, and satisfactory comparisons between the numerical model and the experimental data provides a robust methodology for simulating free-surface complexity near an object.

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