# Viscous coupling of shear-free turbulence across nearly flat fluid interfaces

@article{Hunt2011ViscousCO, title={Viscous coupling of shear-free turbulence across nearly flat fluid interfaces}, author={Julian Charles Roland Hunt and Derek D. Stretch and Stephen E. Belcher}, journal={Journal of Fluid Mechanics}, year={2011}, volume={671}, pages={96 - 120} }

The interactions between shear-free turbulence in two regions (denoted as + and − on either side of a nearly flat horizontal interface are shown here to be controlled by several mechanisms, which depend on the magnitudes of the ratios of the densities, ρ+/ρ−, and kinematic viscosities of the fluids, μ+/μ−, and the root mean square (r.m.s.) velocities of the turbulence, u0+/u0−, above and below the interface. This study focuses on gas–liquid interfaces so that ρ+/ρ− ≪ 1 and also on where…

## 16 Citations

Turbulence dynamics near a turbulent/non-turbulent interface

- PhysicsJournal of Fluid Mechanics
- 2012

Abstract The characteristics of the boundary layer separating a turbulence region from an irrotational (or non-turbulent) flow region are investigated using rapid distortion theory (RDT). The…

Turbulence and Wave Dynamics Across Gas–Liquid Interfaces

- Physics, Environmental Science
- 2011

Mechanisms are reviewed here for the distortion of turbulent flows near thin density interfaces and their effects on transfer processes across them. Firstly the results of rapid distortion…

Two-fluid confined flow in a cylinder driven by a rotating end wall.

- PhysicsPhysical review. E, Statistical, nonlinear, and soft matter physics
- 2012

The simulations show that even when there is significant interfacial deformation, both the dynamics and the equilibrium flow are dominated by vortex bending rather than vortex stretching, and for the range of immiscible fluids considered, surface tension effects are significant.

Numerical investigation of shear-flow free-surface turbulence and air entrainment at large Froude and Weber numbers

- Physics, Environmental ScienceJournal of Fluid Mechanics
- 2019

We investigate two-phase free-surface turbulence (FST) associated with an underlying shear flow under the condition of strong turbulence (SFST) characterized by large Froude ( $Fr$ ) and Weber ( $We$…

Oscillating grid turbulence and its influence on gas liquid mass transfer and mixing in non-Newtonian media

- Physics
- 2018

The study of turbulence induced mass transfer at the interface between a gas and a liquid is of great interest in many environmental phenomena and industrial processes. Even though this issue has…

Turbulent structure of air flow over wind-induced gravity waves

- Environmental Science, Physics
- 2012

This is the second paper in a group of three that reports the systematic measurements of wind-generated water waves in a wind tunnel experiment. Here, the structure of the boundary layer on the air…

Experimental study on oscillating grid turbulence and free surface fluctuation

- Physics
- 2012

This paper analyses the interaction between the turbulence and free surface. The phenomenon takes place in many natural flows and industrial processes. In the present experiments, turbulence is…

Nonlinear coupling of interfacial instabilities with resonant wave interactions in horizontal two-fluid plane Couette–Poiseuille flows: numerical and physical observations

- PhysicsJournal of Fluid Mechanics
- 2016

We investigate mechanisms governing the initial growth and nonlinear evolution of interfacial waves in horizontal two-fluid plane Couette–Poiseuille flows. Nonlinear coupling of the Kelvin–Helmholtz…

Study of the turbulence in the air-side and water-side boundary layers in experimental laboratory wind induced surface waves

- Environmental Science, Physics
- 2012

## References

SHOWING 1-10 OF 51 REFERENCES

Turbulence, waves and mixing at shear-free density interfaces. Part 1. A theoretical model

- Physics, Environmental ScienceJournal of Fluid Mechanics
- 1997

This paper presents a theoretical model of turbulence and mixing at a shear-free stable density interface. In one case (single-sided stirring) the interface separates a layer of fluid of density ρ in…

Direct numerical simulation of near-interface turbulence in coupled gas-liquid flow

- Physics
- 1996

Turbulence structures near the interface between two flowing fluids have been resolved by direct numerical simulation. As a first step the interface has been kept flat, corresponding closely to the…

Turbulence structure in thermal convection and shear-free boundary layers

- Physics, Environmental ScienceJournal of Fluid Mechanics
- 1984

This paper is a study of turbulence near rigid surfaces, in the absence of any mean shear. Different sources of turbulence are considered, including thermal convection and grid turbulence. It is…

Direct numerical simulation of turbulence in a sheared air–water flow with a deformable interface

- Physics, EngineeringJournal of Fluid Mechanics
- 2003

Direct numerical simulation has been performed to explore the turbulence near a freely deformable interface in a countercurrent air–water flow, at a shear Reynolds number $\Re_{\star}=171$. The…

Velocity fluctuations near an interface between a turbulent region and a stably stratified layer

- Physics, Environmental ScienceJournal of Fluid Mechanics
- 1986

Velocity fluctuations are calculated near an interface between a turbulent region and a stably stratified layer, and in the absence of mean shear. Based on the observation that the energy dissipation…

An Analysis of Turbulent Motions In and Around a Differentially Forced Density Interface

- Physics, Environmental Science
- 1999

Abstract:The Rapid-Distortion-Theory-based analysis proposed by Fernando and Hunt [1] is extended to study the nature of turbulence in and around a density interface sandwiched between turbulent…

A numerical study of the evolution and structure of a turbulent shear layer under a free surface

- Physics, Environmental ScienceJournal of Fluid Mechanics
- 1998

Results from direct numerical simulations of an unsteady turbulent shear layer with a free surface are presented. The emphasis is on the interaction dynamics of the free surface with the coherent…

Statistical structure of high-Reynolds-number turbulence close to the free surface of an open-channel flow

- PhysicsJournal of Fluid Mechanics
- 2003

Statistical characteristics of turbulence in the near-surface region of a steady open- channel flow are examined using new data obtained in a high-Reynolds-number large-eddy simulation using a…

The dynamics of strong turbulence at free surfaces. Part 2. Free-surface boundary conditions

- PhysicsJournal of Fluid Mechanics
- 2001

Strong turbulence at a water–air free surface can lead to splashing and a disconnected surface as in a breaking wave. Averaging to obtain boundary conditions for such flows first requires equations…