Fluid–structure modelling for material deformation during cavitation bubble collapse

A microscale model of the brain was developed in order to understand the details of intracranial fluid cavitation and the damage mechanisms associated with cavitation bubble collapse due to blast-induced traumatic brain injury (TBI). Our macroscale model predicted cavitation in regions of high concentration of cerebrospinal fluid (CSF) and blood. The results from this macroscale simulation directed the development of the microscale model of the superior sagittal sinus (SSS) region. The microscale model includes layers of scalp, skull, dura, superior sagittal sinus, falx, arachnoid, subarachnoid spacing, pia, and gray matter. We conducted numerical simulations to understand the effects of a blast load applied to the scalp with the pressure wave propagating through the layers and eventually causing the cavitation bubbles to collapse. Collapse of these bubbles creates spikes in pressure and von Mises stress downstream from the bubble locations. We investigate the influence of cavitation bubble size, compressive wave amplitude, and internal bubble pressure. The results indicate that these factors may contribute to a greater downstream pressure and von Mises stress which could lead to significant tissue damage.

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Molecular dynamics simulations of cavitation bubble collapse and sonoluminescence

New Journal of Physics ◽

10.1088/1367-2630/14/11/113019 ◽

2012 ◽

Vol 14 (11) ◽

pp. 113019 ◽

Cited By ~ 24

Author(s):

Daniel Schanz ◽

Burkhard Metten ◽

Thomas Kurz ◽

Werner Lauterborn

Keyword(s):

Molecular Dynamics ◽

Molecular Dynamics Simulations ◽

Cavitation Bubble ◽

Bubble Collapse ◽

Dynamics Simulations

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Cavitation bubble collapse pressures in a venturi facility.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B ◽

10.1299/kikaib.55.579 ◽

1989 ◽

Vol 55 (511) ◽

pp. 579-584

Author(s):

Tsunenori OKADA ◽

Yoshiro IWAI ◽

Hiroyuki MORl

Keyword(s):

Cavitation Bubble ◽

Bubble Collapse

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Modeling of collapsing cavitation bubble near solid wall by 3D pseudopotential multi-relaxation-time lattice Boltzmann method

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406217740167 ◽

2017 ◽

Vol 232 (3) ◽

pp. 445-456 ◽

Cited By ~ 3

Author(s):

Minglei Shan ◽

Yu Yang ◽

Hao Peng ◽

Qingbang Han ◽

Changping Zhu

Keyword(s):

Relaxation Time ◽

Lattice Boltzmann ◽

Cavitation Bubble ◽

Solid Wall ◽

Three Dimensional ◽

Lattice Boltzmann Model ◽

Bubble Collapse ◽

Lattice Boltzmann Simulation ◽

Boltzmann Method ◽

Boltzmann Model

Understanding the dynamic characteristic of the cavitation bubble near a solid wall is a fundamental issue for the bubble collapse application and prevention. In the present work, an improved three-dimensional multi-relaxation-time pseudopotential lattice Boltzmann model is adopted to investigate the cavitation bubble collapse near the solid wall. With respect to thermodynamic consistency, Laplace law verification, the three-dimensional pseudopotential multi-relaxation-time lattice Boltzmann model is investigated. By the theoretical analysis, it is proved that the model can be regarded as a solver of the Rayleigh–Plesset equation, and confirmed by comparing the results of the lattice Boltzmann simulation and the Rayleigh–Plesset equation calculation for the case of cavitation bubble collapse in the infinite medium field. The bubble collapse near the solid wall is modeled using the improved pseudopotential multi-relaxation-time lattice Boltzmann model. We find the lattice Boltzmann simulation and the experimental results have the same dynamic process by comparing the bubble profiles evolution. Form the pressure field and the velocity field evolution it is found that the tapered higher pressure region formed near the top of the bubble is a crucial driving force inducing the bubble collapse. This exploratory research demonstrates that the lattice Boltzmann method is an alternative tool for the study of the interaction between collapsing cavitation bubble and matter.

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Cavitation erosion behavior of hydraulic concrete under high-speed flow

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-03-2021-2459 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Xin Wang ◽

Ting-Qiang Xie

Keyword(s):

Cavitation Bubble ◽

High Speed ◽

Cavitation Erosion ◽

Concrete Strength ◽

Bubble Collapse ◽

High Speed Flow ◽

Content Type ◽

Erosion Behavior ◽

Hydraulic Concrete ◽

Speed Flow

Purpose Cavitation erosion has always been a common technical problem in a hydraulic discharging structure. This paper aims to investigate the cavitation erosion behavior of hydraulic concrete under high-speed flow. Design/methodology/approach A high-speed and high-pressure venturi cavitation erosion generator was used to simulate the strong cavitation. The characteristics of hydrodynamic loads of cavitation bubble collapse zone, the failure characteristics and the erosion development process of concrete were investigated. The main influencing factors of cavitation erosion were discussed. Findings The collapse of the cavitation bubble group produced a high frequency, continuous and unsteady pulse load on the wall of concrete, which was more likely to cause fatigue failure of concrete materials. The cavitation action position and the main frequency of impact load were greatly affected by the downstream pressure. A power exponential relationship between cavitation load, cavitation erosion and flow speed was observed. With the increase of concrete strength, the degree of damage of cavitation erosion was approximately linearly reduced. Originality/value After cavitation erosion, a skeleton structure was formed by the accumulation of granular particles, and the relatively independent bulk structure of the surface differed from the flake structure formed after abrasion.

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Cinematographic Analysis of Counter Jet Formation in a Single Cavitation Bubble Collapse Flow

Journal of Mechanics ◽

10.1017/jmech.2011.29 ◽

2011 ◽

Vol 27 (2) ◽

pp. 253-266 ◽

Cited By ~ 1

Author(s):

S.-H. Yang ◽

S.-Y. Jaw ◽

K.-C. Yeh

Keyword(s):

Flow Field ◽

Cavitation Bubble ◽

Pressure Wave ◽

Bubble Surface ◽

Bubble Collapse ◽

Solid Boundary ◽

Liquid Jet ◽

Pressure Waves ◽

Field Variation ◽

Critical Position

ABSTRACTThis study utilized a U-shape platform device to generate a single cavitation bubble for the detail analysis of the flow field characteristics and the cause of the counter jet during the process of bubble collapse induced by pressure wave. A series of bubble collapse flows induced by pressure waves of different strengths are investigated by positioning the cavitation bubble at different stand-off distances to the solid boundary. It is found that the Kelvin-Helmholtz vortices are formed when the liquid jet induced by the pressure wave penetrates the bubble surface. If the bubble center to the solid boundary is within one to three times the bubble's radius, a stagnation ring will form on the boundary when impacted by the penetrated jet. The liquid inside the stagnation ring is squeezed toward the center of the ring to form a counter jet after the bubble collapses. At the critical position, where the bubble center from the solid boundary is about three times the bubble's radius, the bubble collapse flows will vary. Depending on the strengths of the pressure waves applied, either just the Kelvin-Helmholtz vortices form around the penetrated jet or the penetrated jet impacts the boundary directly to generate the stagnation ring and the counter jet flow. This phenomenon used the particle image velocimetry method can be clearly revealed the flow field variation of the counter jet. If the bubble surface is in contact with the solid boundary, the liquid jet can only splash radially without producing the stagnation ring and the counter jet. The complex phenomenon of cavitation bubble collapse flows are clearly manifested in this study.

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A Photographic Study of Spark-Induced Cavitation Bubble Collapse

Journal of Basic Engineering ◽

10.1115/1.3425571 ◽

1972 ◽

Vol 94 (4) ◽

pp. 825-832 ◽

Cited By ~ 66

Author(s):

C. L. Kling ◽

F. G. Hammitt

Keyword(s):

Cavitation Bubble ◽

High Speed ◽

Bubble Collapse ◽

Solid Boundary ◽

High Speed Photography ◽

Minimum Volume ◽

Cavitation Bubbles ◽

Flowing System

The collapse of spark-induced cavitation bubbles in a flowing system was studied by means of high speed photography. The migration of cavitation bubbles toward a nearby solid boundary during collapse and rebound was observed. Near its minimum volume the bubble typically formed a high speed microjet, which struck the nearby surface causing individual damage craters on soft aluminum.

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