# The turbulence boundary of a temporal jet

@article{vanReeuwijk2013TheTB,
title={The turbulence boundary of a temporal jet},
author={Maarten van Reeuwijk and Markus Holzner},
journal={Journal of Fluid Mechanics},
year={2013},
volume={739},
pages={254 - 275}
}
• Published 1 April 2013
• Physics
• Journal of Fluid Mechanics
Abstract We examine the structure of the turbulence boundary of a temporal plane jet at $\mathit{Re}= 5000$ using statistics conditioned on the enstrophy. The data is obtained by direct numerical simulation and threshold values span 24 orders of magnitude, ranging from essentially irrotational fluid outside the jet to fully turbulent fluid in the jet core. We use two independent estimators for the local entrainment velocity ${v}_{n}$ based on the enstrophy budget. The data show clear evidence…

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## References

SHOWING 1-10 OF 34 REFERENCES

### The turbulent/non-turbulent interface bounding a far wake

• Physics, Environmental Science
Journal of Fluid Mechanics
• 2002
The velocity fields of a turbulent wake behind a flat plate obtained from the direct numerical simulations of Moser et al. (1998) are used to study the structure of the flow in the intermittent zone

### Kinetic energy budgets near the turbulent/nonturbulent interface in jets

• Physics
• 2013
The dynamics of the kinetic energy near the turbulent/nonturbulent (T/NT) interface separating the turbulent from the irrotational flow regions is analysed using three direct numerical simulations of

### A Lagrangian investigation of the small-scale features of turbulent entrainment through particle tracking and direct numerical simulation

• Physics
Journal of Fluid Mechanics
• 2008
We report an analysis of small-scale enstrophy ω2 and rate of strain s2 dynamics in the proximity of the turbulent/non-turbulent interface in a flow without strong mean shear. The techniques used are

### Momentum and scalar transport at the turbulent/non-turbulent interface of a jet

• Physics
Journal of Fluid Mechanics
• 2009
Conditionally sampled measurements with particle image velocimetry (PIV) of a turbulent round submerged liquid jet in a laboratory have been taken at Re = 2 × 103 between 60 and 100 nozzle diameters

### On the influence of coherent structures upon interscale interactions in turbulent plane jets

• Physics, Environmental Science
Journal of Fluid Mechanics
• 2002
The influence of the coherent structures on grid/subgrid-scale (GS/SGS) interactions in free shear layers is analysed through the application of a top-hat filter to several plane jet direct numerical

### Investigations on the local entrainment velocity in a turbulent jet

• Physics
• 2012
We report an experimental analysis of the local entrainment velocity in the self-similar region of a turbulent jet. Particle tracking velocimetry is performed to determine the position of the

### Mechanics of the turbulent-nonturbulent interface of a jet.

• Physics
Physical review letters
• 2005
Observations provide a justification for Prandtl's original hypothesis of a constant eddy viscosity in the nonturbulent outer jet region and Interpretation of the jump as a singular structure yields an essential and significant contribution to the mean shear in the jet mixing region.

### Laminar superlayer at the turbulence boundary.

• Physics
Physical review letters
• 2011
Results from particle tracking velocimetry and direct numerical simulation that are congruent with the existence of a laminar superlayer are presented, finding that the local superlayer velocity is dominated by a viscous component and its magnitude is comparable to the characteristic velocity of the smallest scales of motion.

### Some characteristics of entrainment at a cylindrical turbulence boundary

• Physics, Environmental Science
• 2002
Over the last 30 years, turbulent entrainment has come to be viewed as a large-scale process, directed by coherent structures, and described as engulfing. With turbulence simulations, we examined the

### Wind and boundary layers in Rayleigh-Bénard convection. I. Analysis and modeling.

• Environmental Science, Physics
Physical review. E, Statistical, nonlinear, and soft matter physics
• 2008
A simple model capturing the essential processes governing the wind structure is derived that reproduces the Ra dependence of wind Reynolds number and temperature amplitude and is largely determined by the turbulence in the bulk rather than by the wall-shear stress.