Interactions Between Turbulence and Interfaces with Surface Tension

Chiodi, Robert; McCaslin, Jeremy

doi:10.1007/978-3-030-12547-9_26

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…An initially flat interface is placed inside a box of fully developed isotropic turbulence. The fully developed isotropic turbulence field was graciously provided by R. Chiodi and O. Desjardins [27]. Both density and viscosity ratio are unity in a turbulent field that has a Reynolds number of Re λ = 156.…”

Section: Resultsmentioning

confidence: 99%

A Dual-Scale Approach for Finite Weber Simulations

Kedelty

Herrmann

2021

ICLASS

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Direct Numerical Simulation remains an expensive task for atomization simulations. To decrease the burden of DNS, a Dual-Scale modeling approach (Gorokhovski and Herrmann, 2008) that describes turbulent phase interface dynamics in a Large Eddy Simulation spatial filtering context is proposed. Spatial Filtering of the equations of fluid motion introduce several sub-filter terms that require modeling. Instead of developing individual closure models for the interface associated terms, the Dual-Scale approach uses an exact closure by explicitly filtering a fully resolved realization of the phase interface. The resolved realization is maintained using a Refined Local Surface Grid approach (Herrmann, 2008) employing an unsplit geometric Volume-of-Fluid method (Owkes and Desjardins, 2014). Advection of the phase interface on this DNS scale requires reconstruction of the fully resolved interface velocity. In this work results from the Dual-Scale LES model employing a sub-filter turbulent eddy reconstruction by combined approximate deconvolution and non-linear spectral enrichment (Bassenne et al. 2019) and sub-filter surface tension model (Herrmann 2013) are compared to DNS results for a phase interface in homogeneous isotropic turbulent flow at two different Weber numbers.

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Section: Resultsmentioning

confidence: 99%

A Dual-Scale Approach for Finite Weber Simulations

Kedelty

Herrmann

2021

ICLASS

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“…For our disk with a much smaller scale, surface tension plays a crucial role in extracting energy from internal turbulence when making an additional free-surface area (forming surface waves). A deforming liquid-gas interface is known to reduce the intensity of turbulent structures with eddy size comparable to the wavelength of the deforming interface (Chiodi, McCaslin & Desjardins 2019). Because the free surface absorbs a significant portion of turbulent energy through surface deformation, the amount Because the local Reynolds number strongly influences the generation and interaction mechanisms of three-dimensional waves, correlating the amplitude of the waves with the long-wave parameter δ = (ν/ Ω) 1/2 , which represents the characteristic scale for film thickness in (3.1), is not preferable.…”

Section: Effects Of Upstream Backscattermentioning

confidence: 99%

Low-order modelling of three-dimensional surface waves in liquid film flow on a rotating disk

Kim,

Kim

2024

J. Fluid Mech.

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Using low-dimensional numerical simulations, we investigate the characteristics of complex and three-dimensional surface waves in a liquid film flowing over a rotating disk, focusing on large flow rates from a nozzle. Existing integral boundary layer (IBL) models, which are based on spatially averaged variables along the direction normal to the disk surface, have primarily focused on the formation of axisymmetric waves under relatively small flow rates. In this study, an extended IBL model that accounts for both laminar and turbulent regimes is developed by considering the non-uniformity of the local flow rate in the spreading film flow and incorporating closure models dependent on the local Reynolds number. Our numerical results successfully capture the generation of concentric waves by an impinging circular liquid jet and their transition into three-dimensional solitary waves. These findings are in good agreement with visualization images and time-series data of free-surface fluctuations from a displacement sensor. The backscattering of small-scale three-dimensional turbulence into large-scale horizontal turbulence inside the film plays a critical role in determining the transition of wave modes and the nonlinear dynamics of the waves in the turbulent regime. Furthermore, the behaviour of three-dimensional waves in the downstream region, including frequent wave coalescence in the transition region and the breakup of small-scale solitons, is distinct from that of gravity-driven falling film flows. The amplitude of the three-dimensional waves is inversely related to the generalized Reynolds number defined for rotating films.

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Interactions Between Turbulence and Interfaces with Surface Tension

Cited by 2 publications

References 14 publications

A Dual-Scale Approach for Finite Weber Simulations

A Dual-Scale Approach for Finite Weber Simulations

Low-order modelling of three-dimensional surface waves in liquid film flow on a rotating disk

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