A numerical study of liquid atomization regimes by means of conservative level-set simulations

Schillaci, Eugenio; Antepara, Oscar; Balcázar, Néstor; Serrano, Joaquim Rigola; Oliva, A.

doi:10.1016/j.compfluid.2018.10.017

Cited by 20 publications

(14 citation statements)

References 39 publications

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“…The numerical algorithms have been implemented in a parallel C++/MPI platform called TermoFluids 52 . Furthermore, the unstructured finite‐volume CLS method has been extensively verified and validated with several results from the literature, including dam‐break, 16 rising bubbles, 16,21,53,54 bubbly flows, 17‐19 droplet collision against a fluid‐fluid interface and droplets bouncing collision, 18 thermocapillary‐driven motion of deformable fluid particles, 13 Taylor bubbles, 55 atomization of a liquid‐gas jet, 56,57 non‐Newtonian two‐phase flow, 58 and mass transfer from bubble swarms 19,20 . Therefore, this research can be considered as a further step in the development of numerical methodologies to solve two‐phase flows on complex geometries, with the aid of a finite‐volume/level‐set method introduced by References 13,16,17,19, and an adaptive tetrahedral‐mesh refinement method proposed in this work.…”

Section: Mathematical Model and Numerical Methodsmentioning

confidence: 57%

“…The newly adapted mesh is obtained from an input mesh through some geometrical manipulations: operations of refinement and coarsening until a maximum level of refinement is achieved. This methodology is a further step to extend our previous work about the development of AMR algorithms on hexahedral meshes 54,56,57,59,60 to tetrahedral meshes for the solution of computational fluid dynamics problems on complex domains.…”

Section: Adaptive Mesh Refinement For Tetrahedral Meshesmentioning

confidence: 99%

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Tetrahedral adaptive mesh refinement for two‐phase flows using conservative level‐set method

Antepara

Balcázar²,

Oliva

2020

Numerical Methods in Fluids

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SummaryIn this article, we describe a parallel adaptive mesh refinement strategy for two‐phase flows using tetrahedral meshes. The proposed methodology consists of combining a conservative level‐set method with tetrahedral adaptive meshes within a finite volume framework. Our adaptive algorithm applies a cell‐based refinement technique and adapts the mesh according to physics‐based refinement criteria defined by the two‐phase application. The new adapted tetrahedral mesh is obtained from mesh manipulations of an input mesh: operations of refinement and coarsening until a maximum level of refinement is achieved. For the refinement method of tetrahedral elements, geometrical characteristics are taking into consideration to preserve the shape quality of the subdivided elements. The present method is used for the simulation of two‐phase flows, with surface tension, to show the capability and accuracy of 3D adapted tetrahedral grids to bring new numerical research in this context. Finally, the applicability of this approach is shown in the study of the gravity‐driven motion of a single bubble/droplet in a quiescent viscous liquid on regular and complex domains.

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Section: Mathematical Model and Numerical Methodsmentioning

confidence: 57%

Section: Adaptive Mesh Refinement For Tetrahedral Meshesmentioning

confidence: 99%

Tetrahedral adaptive mesh refinement for two‐phase flows using conservative level‐set method

Antepara

Balcázar²,

Oliva

2020

Numerical Methods in Fluids

Self Cite

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“…133-137) 67 0 67 Wu et al (1995, fig. 7) 110 0 110 Tang and Masutani (2003) 75 0 75 Schillaci et al (2019) 11 0 11 This work 120 1094 1188…”

Section: Photosmentioning

confidence: 94%

Reevaluating the jet breakup regime diagram

Trettel¹

2019

Preprint

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Identifying the regime of a liquid jet is necessary to determine the physical mechanisms causing breakup and consequently how to model the jet. Existing regime diagrams are based on a small amount of data classified by superficial visual characteristics, making these diagrams too inaccurate to reliably determine the correct regime. A more accurate regime diagram is developed using a large compilation of breakup length data combined with theory where the data is sparse. Improvements in the regime diagram include a new regime, the addition of the nozzle critical Reynolds number and the turbulence intensity as variables, and the recognition that how the regimes change with increasing velocity (i.e., Rayleigh to first wind-induced to second wind-induced to atomization) is not universal.

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“…In past decades, there are many numerical and experimental studies on the atomizer. For example, Eugenio used a conservative level-set to simulate the liquid atomization regimes [7]. Davide developed an improved multiscale Eulerian-Lagrangian method for simulation of the atomization process [8].…”

Section: Fig 1 Medical Nebulizer Systemmentioning

confidence: 99%

Transient Atomization Modeling and Optimal Design of a Medical Air-Compressing Nebulizer

Wang

Yao

et al. 2020

IEEE Access

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This paper studies three-dimensional transient flow characteristics of a medical aircompressing nebulizer which is widely used to treat respiratory diseases in the medical field. The transient atomization process of air and water was numerically simulated and reproduced by solving Navier-Stokes equations, turbulent transport equations, the volume of fluid (VOF) model, and discrete phase model (DPM) model. The water volume fraction inside the nebulizer was simulated and demonstrated utilizing animation. Besides, to better the working performance of the nebulizer, the effects of different working parameters such as different orifice diameters, length of the outflow pipe, and air velocity on the secondary atomization were also studied and discussed. Finally, the droplet breaking process of this type of atomizer is inferred.

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A numerical study of liquid atomization regimes by means of conservative level-set simulations

Abstract: Portal del coneixement obert de la UPC http://upcommons.upc.edu/e-prints Aquesta és una còpia de la versió author's final draft d'un article publicat a la revista Computers & Fluids.

Cited by 20 publications

References 39 publications

Tetrahedral adaptive mesh refinement for two‐phase flows using conservative level‐set method

Tetrahedral adaptive mesh refinement for two‐phase flows using conservative level‐set method

Reevaluating the jet breakup regime diagram

Transient Atomization Modeling and Optimal Design of a Medical Air-Compressing Nebulizer

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