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TWO-PHASE FLOW COMPUTATIONS BY THE HYBRID PARTICLE-LEVEL-SET METHOD

Daniel Gaudlitz
Institute for Aerodynamics and Fluid Mechanics Technische Universitat Munchen Boltzmannstr. 15, 85748 Garching bei Munchen, Germany

Nikolaus A. Adams
Chair of Aerodynamics and Fluid Mechanics, Department of Mechanical Engineering, Technical University of Munich, 85748 Garching bei München, Germany

Abstract

In the present paper we investigate two-phase flows by numerical simulations with the hybrid particle-level-set method (HPLS). The HPLS-scheme is an extension of the original level-set technique with the purpose of improving mass conservation for moving interfaces. We have applied the HPLS-method to the simulation of gas bubbles rising in liquids. These two-phase flows exhibit large density and viscosity ratios, and a significant surface-tension force acts at the interface. Flow configurations with steadily rising bubbles with a closed wake and bubbles with open wakes ascending on spiraling paths have been investigated. The former were used mainly for validation purposes by confirming that the geometry of the closed wake is in good agreement with experiments. For the latter configuration the open unsteady wake leads to a helical or a zig-zag ascent path. It is confirmed that a periodic shedding of large vortical structures accompanies the lateral movement of the bubble.