A smoothed particle hydrodynamics study of the collapse for a cylindrical cavity

Albano, Andrea; Alexiadis, Alessio

doi:10.1371/journal.pone.0239830

Cited by 8 publications

(19 citation statements)

References 73 publications

(101 reference statements)

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“…Four preliminary simulations with different particle resolutions have been carried out with R 0 = 100 [µm], P ∞ = 5 MPa and γ = 1.2. These values are chosen to match those commonly used in computational studies [14,17,52]. Figure 2 shows the total collapse time and the max jet speed (defined as V = |v|) for the different resolutions.…”

Section: Preliminary Resultsmentioning

confidence: 99%

“…Moreover, they have fixed position and density to keep constant pressure as boundary condition. The extension of shell region has been discussed in previous work [17].…”

Section: Computational Set Upmentioning

confidence: 95%

“…The dimensionless dissipation factor, time step and speed of sound were set as α = 1, t s = 1e − 10 [s] and c 0 = 1484 [m s −1 ]. The sensitivity of the results to parameters such as the kernel function, EOS or h, was investigated in a previous publication for the case of symmetric collapse [17]. In the next section, the particle resolution for the specific case of non-symmetric collapse is discussed.…”

Section: Computational Set Upmentioning

confidence: 99%

“…Form our knowledge an equation to validate the dynamic of a non-symmetrical collapse has still to be developed. For this reason, as commonly done in the literature [15,17,46,47], the model presented as been validated for the case of symmetric collapse against Equation (6) [17].…”

Section: Computational Set Upmentioning

confidence: 99%

“…Nair and Tomar [16] used SPH to simulate an oscillating gas filled cylindrical cavity under a variable isotropic pressure field. Albano and Alexiadis [17] developed a SPH model to study the Rayleigh collapse of a gas filled cylindrical cavity that takes in account the heat diffusion at the gas-liquid interface. Among these studies, only Joshi et al and Pineda et al take in account anisotropic collapses.…”

Section: Introductionmentioning

confidence: 99%

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Non-Symmetrical Collapse of an Empty Cylindrical Cavity Studied with Smoothed Particle Hydrodynamics

Albano

Alexiadis

2021

Applied Sciences

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The non-symmetrical collapse of an empty cylindrical cavity is modeled using Smoothed Particle Hydrodynamics. The presence of a nearby surface produces an anisotropic pressure field generating a high-velocity jet that hits the surface. The collapse follows a different dynamic based on the initial distance between the center of the cavity and the surface. When the distance is greater than the cavity radius (detached cavity) the surface is hit by traveling shock waves. When the distance is less than the cavity radius (attached cavity) the surface is directly hit by the jet and later by other shock waves generated in the last stages of the of the collapse. The results show that the surface is hit by a stronger shock when distance between the center of the cavity and the surface is zero while showing more complex double peaks behavior for other distances.

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Section: Preliminary Resultsmentioning

confidence: 99%

“…Moreover, they have fixed position and density to keep constant pressure as boundary condition. The extension of shell region has been discussed in previous work [17].…”

Section: Computational Set Upmentioning

confidence: 95%

Section: Computational Set Upmentioning

confidence: 99%

Section: Computational Set Upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Non-Symmetrical Collapse of an Empty Cylindrical Cavity Studied with Smoothed Particle Hydrodynamics

Albano

Alexiadis

2021

Applied Sciences

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Predicting the Flow Behavior and Residence Time Distribution in Chemical Reactors: A Simplified and Fast Approach Using Smoothed Particle Hydrodynamics

Asif,

Grande

2023

Advcd Theory and Sims

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Understanding the flow dynamics of chemical species is important for characterizing, analyzing, and designing chemical reactors. Computational fluid dynamics (CFD) provides accurate flow patterns, but this approach can be computationally expensive for large or complex geometries. To overcome this limitation, a new Lagrangian‐based method is developed using smoothed particle hydrodynamics (SPH) to forecast the flow patterns and residence time distribution of two different fluids for various reactor geometries: (laminar, fractal, T‐mixer, Hartridge–Roughton (H‐R) mixer and packed bed with a gyroid internal packing) and compared the results with computational fluid dynamics (CFD) simulations. The SPH method is less accurate than the CFD analysis, but it obtained the approximate flow behavior much faster. Consequently, the SPH method has significant potential as a first screening technique to optimize reactor topologies and internal packing structures.

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Modeling stable cavitation of coated microbubbles: A framework integrating smoothed dissipative particle dynamics and the Rayleigh–Plesset equation

Nguyen

2024

The Journal of Chemical Physics

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Coated microbubbles are widely used in medical applications, particularly in enhanced drug and gene delivery. One of the mechanisms underlying these applications involves the shear stress exerted on the cell membrane by acoustic microstreaming generated through cavitation bubbles. In this study, we develop a novel simulation approach that combines the smooth dissipative particle dynamics (SDPD) simulation method with numerical modeling of the Rayleigh–Plesset-like equation in an ad hoc manner to simulate stable cavitation of microbubbles at microsecond and micrometer scales. Specifically, the SDPD method is utilized to model fluid dynamics, while the Rayleigh–Plesset-like equation is employed to describe bubble dynamics. Adopting a 1.5 μm coated microbubble driven by ultrasound with a frequency of 2 MHz and a pressure of 500 kPa as a representative example, we observe a high-velocity microstreaming pattern emerging around the bubble on a very small scale of a few micrometers after only a few microseconds. These spatiotemporal scales may pose challenges for experimental observation. The formation of this microstreaming arises from the opposing motion of the fluid layer next to the bubble and the fluid layers further away. Furthermore, our simulations reveal high shear stress levels of thousands of Pascals exerted on a wall located a few micrometers from the bubble. This contrasts with the shear stress values of a few Pascals calculated from theoretical models in the literature, which do not incorporate radial streaming into their theories. The implications of our results for bubble cavitation-induced pore formation on the cell membrane are discussed in some details.

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A smoothed particle hydrodynamics study of the collapse for a cylindrical cavity

Cited by 8 publications

References 73 publications

Non-Symmetrical Collapse of an Empty Cylindrical Cavity Studied with Smoothed Particle Hydrodynamics

Non-Symmetrical Collapse of an Empty Cylindrical Cavity Studied with Smoothed Particle Hydrodynamics

Predicting the Flow Behavior and Residence Time Distribution in Chemical Reactors: A Simplified and Fast Approach Using Smoothed Particle Hydrodynamics

Modeling stable cavitation of coated microbubbles: A framework integrating smoothed dissipative particle dynamics and the Rayleigh–Plesset equation

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