204 Numerical Analysis of Nonspherical Bubble Collapse and Induced Impulsive Pressure near Wall Boundary

2010 ◽  
Vol 2010.45 (0) ◽  
pp. 208-209
Author(s):  
Naoya OCHIAI ◽  
Yuka IGA ◽  
Motohiko NOHMI ◽  
Toshiaki IKOHAGI
Keyword(s):  
Numerical Analysis ◽  
Bubble Collapse ◽  
Wall Boundary ◽  
Impulsive Pressure ◽  
Near Wall

0406 A Study of Nonspherical Bubble Collapse Behavior near Wall Boundary

2010 ◽  
Vol 2010 (0) ◽  
pp. 131-132
Author(s):  
Naoya OCHIAI ◽  
Yuka IGA ◽  
Motohiko NOHMI ◽  
Toshiaki IKOHAGI
Keyword(s):  
Bubble Collapse ◽  
Wall Boundary ◽  
Collapse Behavior ◽  
Near Wall

1016 Numerical Analysis for Bubble Collapse near a Gelatin Surface Using Multi-Grid Ghost Fluid Method

2010 ◽  
Vol 2010.85 (0) ◽  
pp. _10-16_
Author(s):  
Yoshinori JINBO ◽  
Sei SYU ◽  
Kazumichi KOBAYASHI ◽  
Hiroyuki TAKAHIRA
Keyword(s):  
Numerical Analysis ◽  
Bubble Collapse ◽  
Ghost Fluid Method

Modelling of material pitting from cavitation bubble collapse

2014 ◽  
Vol 755 ◽  
pp. 142-175 ◽  
Author(s):  
Chao-Tsung Hsiao ◽  
A. Jayaprakash ◽  
A. Kapahi ◽  
J.-K. Choi ◽  
Georges L. Chahine
Keyword(s):  
Cavitation Bubble ◽  
Bubble Dynamics ◽  
Numerical Approach ◽  
Bubble Collapse ◽  
Material Surface ◽  
Collapse Pressure ◽  
Flow Solver ◽  
Incompressible Boundary ◽  
The Impact ◽  
Impulsive Pressure

AbstractMaterial pitting from cavitation bubble collapse is investigated numerically including two-way fluid–structure interaction (FSI). A hybrid numerical approach which links an incompressible boundary element method (BEM) solver and a compressible finite difference flow solver is applied to capture non-spherical bubble dynamics efficiently and accurately. The flow codes solve the fluid dynamics while intimately coupling the solution with a finite element structure code to enable simulation of the full FSI. During bubble collapse high impulsive pressures result from the impact of the bubble re-entrant jet on the material surface and from the collapse of the remaining bubble ring. A pit forms on the material surface when the impulsive pressure is large enough to result in high equivalent stresses exceeding the material yield stress. The results depend on bubble dynamics parameters such as the size of the bubble at its maximum volume, the bubble standoff distance from the material wall, and the pressure driving the bubble collapse. The effects of these parameters on the re-entrant jet, the following bubble ring collapse pressure, and the generated material pit characteristics are investigated.

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