A multi-material flow solver for high speed compressible flows

Kapahi, Anil; Hsiao, Chao-Tsung; Chahine, Georges L.

doi:10.1016/j.compfluid.2015.03.016

Cited by 19 publications

(16 citation statements)

References 34 publications

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“…The bubble dynamics cleaning problem is also addressed here using a multi-material compressible Euler equation solver based on a finite difference method [63][64][65]. Continuity and momentum equations for the compressible liquid can be written as follows in Cartesian coordinates: …”

Section: Inclusion Of Liquid Compressibilitymentioning

confidence: 99%

“…The void fraction can be deduced from tracking bubbles in a Lagrangian fashion through coupling with 3DYNAFS-Dsm, which treats the bubbles as singularities accounting for their volume change and slip velocity relative to the liquid [60][61][62]. (d) Finally, compressible effects are handled by which utilizes a mixed cell approach to consider a multi-material fluid domain with interface and shock wave capturing [63][64][65].…”

Section: Modeling Approachesmentioning

confidence: 99%

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Modeling of surface cleaning by cavitation bubble dynamics and collapse

Chahine

Kapahi

Choi

et al. 2016

Ultrasonics Sonochemistry

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325

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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Section: Inclusion Of Liquid Compressibilitymentioning

confidence: 99%

Section: Modeling Approachesmentioning

confidence: 99%

Modeling of surface cleaning by cavitation bubble dynamics and collapse

Chahine

Kapahi

Choi

et al. 2016

Ultrasonics Sonochemistry

Self Cite

325

101

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“…On the other hand, the compressible flow solvers used here (GEMINI developed by the US Navy at NSWCIH [46] and 3DYNAFS-COMP [61]) are most adequate to model shock wave emission and propagation, liquid-liquid, and liquid-solid impacts. The method requires, however, very fine grids and very small time steps to resolve shock wavefronts.…”

Section: Compressible -Incompressible Link Proceduresmentioning

confidence: 99%

“…This approach uses a Lagrangian treatment for the cells including an interface and an Eulerian treatment for cells away from interfaces. A re-map procedure is employed to map the Lagrangian solution back to the Eulerian grid [46,61] The code has been extensively validated against experiments [45,49].…”

Section: Compressible Flow Modellingmentioning

confidence: 99%

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Modelling cavitation erosion using fluid–material interaction simulations

Chahine¹,

Hsiao²

2015

Interface Focus.

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Material deformation and pitting from cavitation bubble collapse is investigated using fluid and material dynamics and their interaction. In the fluid, a novel hybrid approach, which links a boundary element method and a compressible finite difference method, is used to capture non-spherical bubble dynamics and resulting liquid pressures efficiently and accurately. The bubble dynamics is intimately coupled with a finite-element structure model to enable fluid/structure interaction simulations. Bubble collapse loads the material with high impulsive pressures, which result from shock waves and bubble re-entrant jet direct impact on the material surface. The shock wave loading can be from the re-entrant jet impact on the opposite side of the bubble, the fast primary collapse of the bubble, and/or the collapse of the remaining bubble ring. This produces high stress waves, which propagate inside the material, cause deformation, and eventually failure. A permanent deformation or pit is formed when the local equivalent stresses exceed the material yield stress. The pressure loading depends 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 standoff and material type on the pressure loading and resulting pit formation are highlighted and the effects of bubble interaction on pressure loading and material deformation are preliminarily discussed.

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