Numerical Analysis of Bubble Evolution Near a Solid Wall Using a Sharp-interface Levelset Method (en)

* Presenting author
Day / Time: 09.03.2023, 09:00-09:20
Room: Saal Y4
Typ: Vortrag (strukturierte Sitzung)
Abstract: The growth and collapse of a single cavitation bubble is investigated in the vicinity to a planar solid wall. We solve the fluid motion with the fully compressible Navier-Stokes equations and employ a sharp-interface level-set method to capture the interface dynamics. A wide range of initial bubble separations to the wall is covered, but we mainly focus on the near-wall region where the bubble remains close to the wall over its entire evolution. We observe a significant influence of the collapse behavior and imposed pressure loads due to the presence of the three jetting regimes: needle, mixed, and regular jets. For intermediate standoff distances the maximum wall-pressure is mainly influenced by the jet delay time and faces a drop where the delay has a maximum. In all simulations a liquid film forms between the wall and the bubble whenever the initial bubble is detached from the wall. This film strongly affects the asymmetry of the maximum grown bubble and the resulting jetting phenomena. Additionally, the collapse and expansion times of the bubble are affected by its symmetry resulting in non-monotone time prolongations in the near-wall region.


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