Near-surface dynamics of a gas bubble collapsing above a crevice

Theresa Trummler (1) , Spencer Bryngelson (2) , Kevin Schmidmayer (2) , Steffen Schmidt (1) , Tim Colonius (2) , Nikolaus Adams (1)

1 Chair of Aerodynamics and Fluid Mechanics
2 Caltech Division of Engineering and Applied Science

The impact of a collapsing gas bubble above rigid, notched walls is considered. Such surface crevices and imperfections often function as bubble nucleation sites, and thus have a direct relation to cavitation-induced erosion and damage structures. A generic configuration is investigated numerically using a second-order accurate compressible multi-component flow solver in a two-dimensional axisymmetric coordinate system. Results show that the crevice geometry has a significant effect on the collapse dynamics, jet formation, subsequent wave dynamics and interactions. The wall-pressure distribution associated with erosion potential is a direct consequence of development and intensity of these flow phenomena.

Mots clés: bubble dynamics; cavitation; compressible flows

Domaines: Mécanique des fluides [physics.class-ph]; Modélisation et simulation; Equations aux dérivées partielles [math.AP]

Theresa Trummler, Spencer Bryngelson, Kevin Schmidmayer, Steffen Schmidt, Tim Colonius, et al.. Near-surface dynamics of a gas bubble collapsing above a crevice. Journal of Fluid Mechanics, 2020, 899, pp.A16. ⟨10.1017/jfm.2020.432⟩. ⟨hal-03649427⟩