The Influence of Structural Deformation on Water Jet Impact Loading

Chahine, Georges L.; Kalumuck, Kenneth

doi:10.1006/jfls.1997.0127

Cited by 17 publications

(9 citation statements)

References 8 publications

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“…Additional details on the procedure can be found in [49,52,87]. This FSI coupling procedure has only a first-order time accuracy.…”

Section: Fluid Structure Interaction Couplingmentioning

confidence: 99%

“…The potential flow model used in this study is based on a Boundary Element Method (BEM) [49][50][51][52][53][54]. The Laplace equation, r 2 / = 0, is solved for the velocity potential, /, defined through u = r/, where u is the velocity vector.…”

Section: Boundary Element Modelmentioning

confidence: 99%

“…(a) A potential flow module, 3DYNAFS-BEMÓ [49][50][51][52][53][54], which enables detailed modeling of the bubble reentrant jet with high accuracy because the interface is directly tracked and high grid refinement is feasible at a low cost since only surface (as opposed to volume) gridding is needed. This BEM code can account for the presence of a background flow around the bubble such as shear near a wall through use of the Helmholtz decomposition [57][58][59].…”

Section: Modeling Approachesmentioning

confidence: 99%

“…The resulting reentrant jet has been found to play an important role in hydrodynamics and ultrasonic cavitation, as well as in large-scale underwater explosion problems [20,[48][49][50][51][52][53] and in small-scale medical applications [54]. Modeling approaches started with incompressible potential flow methods using the observation that the dynamics of the concerned bubble is highly inertial where liquid viscosity influence is very low, while liquid velocities remain smaller than the sound speed enabling the assumption of incompressibility.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of surface cleaning by cavitation bubble dynamics and collapse

Chahine

Kapahi

Choi

et al. 2016

Ultrasonics Sonochemistry

313

101

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Surface cleaning using cavitation bubble dynamics is investigated numerically through modeling of bubble dynamics, dirt particle motion, and fluid material interaction. Three fluid dynamics models; a potential flow model, a viscous model, and a compressible model, are used to describe the flow field generated by the bubble all showing the strong effects bubble explosive growth and collapse have on a dirt particle and on a layer of material to remove. Bubble deformation and reentrant jet formation are seen to be responsible for generating concentrated pressures, shear, and lift forces on the dirt particle and high impulsive loads on a layer of material to remove. Bubble explosive growth is also an important mechanism for removal of dirt particles, since strong suction forces in addition to shear are generated around the explosively growing bubble and can exert strong forces lifting the particles from the surface to clean and sucking them toward the bubble. To model material failure and removal, a finite element structure code is used and enables simulation of full fluid-structure interaction and investigation of the effects of various parameters. High impulsive pressures are generated during bubble collapse due to the impact of the bubble reentrant jet on the material surface and the subsequent collapse of the resulting toroidal bubble. Pits and material removal develop on the material surface when the impulsive pressure is large enough to result in high equivalent stresses exceeding the material yield stress or its ultimate strain. Cleaning depends on parameters such as the relative size between the bubble at its maximum volume and the particle size, the bubble standoff distance from the particle and from the material wall, and the excitation pressure field driving the bubble dynamics. These effects are discussed in this contribution.

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“…Additional details on the procedure can be found in [49,52,87]. This FSI coupling procedure has only a first-order time accuracy.…”

Section: Fluid Structure Interaction Couplingmentioning

confidence: 99%

Section: Boundary Element Modelmentioning

confidence: 99%

Section: Modeling Approachesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling of surface cleaning by cavitation bubble dynamics and collapse

Chahine

Kapahi

Choi

et al. 2016

Ultrasonics Sonochemistry

313

101

View full text Add to dashboard Cite

show abstract

“…Guo and Ramulu [4] used Moire´interferometry to measure the displacement distribution of the erosion surface. Compared to these experimental investigations on WJ, there are a few literatures [6][7][8][9] focused on the numerical simulation of the impact process, which is used often by the means of finite element analysis (FEA) to calculate the motion/deformation of the flow and the target. But this fluid-solid impact problem, often accompanied with the large deformation, may lead to the distortion of the mesh in FEA as depicted in Section 3.3.…”

Section: Introductionmentioning

confidence: 99%