Numerical simulation of trajectory and deformation of bubble in tip vortex

Abstract

According to the behaviors of a bubble in the ship wake flow, the numerical simulation is divided into two stages, quasi-spherical motion and non-spherical motion, based on whether the bubble is captured by the vortex or not. The one-way coupled particle tracking method (PTM) and the boundary element method (BEM) are adopted to simulate these two stages, respectively. Meanwhile, the initial condition of the second stage is taken as the output of the first one, and the entire simulation is connected and completed. Based on the numerical results and the published experimental data, the cavitation inception is studied, and the wake bubble is tracked. Besides, the split of the bubble captured by the vortex and the following sub-bubbles are simulated, including motion, deformation, and collapse. The results provide some insights into the control on wake bubbles and optimization of the wake flow.

Bubble–bubble interaction effects on dynamics of multiple bubbles in a vortical flow field

“…Besides, the capture time in experiment is 2.8 ms while the numerical one is 2.6 ms, which are close too. For more discussions, refer to Ni et al 15 The agreement validates the single-bubble model in the Gaussian vortex flow and the coupling effects of multi-bubbles will be studied on this basis.…”

“…Numerical results were compared with the experimental study of Choi and Ceccio 14 who recorded the deformation of individual cavitation vortex bubble produced by a laser-initiated nuclei passing through a region of pressure reduction and recovery. Ni et al 15 and Zhang and Ni 16 used one-way coupled particle tracking method and the boundary element method to simulate the entire process of the motion of a bubble in a Gaussian line vortex field, including its release, capture, inception, deformation and splitting.…”

On the dynamics of vortex–droplet co-axial interaction: insights into droplet and vortex dynamics

“…Several other researchers have used a similar particle tracking model for moderate to large Reynolds number (Raju & Meiburg 1997; Magnaudet & Eames 2000; Ni et al. 2012; Chen et al. 2019) values.…”

“…Maxey & Riley (1983) considered the forces acting on a rigid sphere in zero Reynolds number flows by separately modelling disturbed and undisturbed flows. Several other researchers have used a similar particle tracking model for moderate to large Reynolds number (Raju & Meiburg 1997;Magnaudet & Eames 2000;Ni et al 2012;Chen et al 2019) values. The inertia force at the leading edge is expressed in terms of the other forces as…”