# Conditional statistics of the turbulent/non-turbulent interface in a jet flow

@article{Gampert2013ConditionalSO, title={Conditional statistics of the turbulent/non-turbulent interface in a jet flow}, author={Markus Gampert and V. Narayanaswamy and P. W. Schaefer and Norbert Peters}, journal={Journal of Fluid Mechanics}, year={2013}, volume={731}, pages={615 - 638} }

Abstract Using two-dimensional high-speed measurements of the mixture fraction $Z$ in a turbulent round jet with nozzle-based Reynolds numbers $R{e}_{0} $ between 3000 and 18 440, we investigate the scalar turbulent/non-turbulent (T/NT) interface of the flow. The mixture fraction steeply changes from $Z= 0$ to a final value which is typically larger than 0.1. Since combustion occurs in the vicinity of the stoichiometric mixture fraction, which is around $Z= 0. 06$ for typical fuel/air mixtures… Expand

#### 27 Citations

GRADIENT TRAJECTORY ANALYSIS OF THE TURBULENT/NON-TURBULENT INTERFACE IN A JET FLOW

- Physics
- 2013

Based on planar high-speed Rayleigh scattering measurements of the mixture fraction Z of propane discharging from a turbulent round jet into co-flowing carbon dioxide at nozzle based Reynolds numbers… Expand

Statistics of the turbulent/non-turbulent interface in a spatially developing mixing layer

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The thin interface separating the inner turbulent region from the outer irrotational fluid is analysed in a direct numerical simulation of a spatially developing turbulent mixing layer. A vorticity… Expand

Properties of the turbulent/non-turbulent interface in boundary layers

- Physics
- Journal of Fluid Mechanics
- 2016

The turbulent/non-turbulent interface is analysed in a direct numerical simulation of a boundary layer in the Reynolds number range $Re_{{\it\theta}}=2800{-}6600$ , with emphasis on the behaviour of… Expand

The behaviour of the scalar gradient across the turbulent/non-turbulent interface in jets

- Physics
- 2017

The dynamics of a passive scalar field near a turbulent/non-turbulent interface is analysed through direct numerical simulations of turbulent planar jets, with Reynolds numbers ranging from 142 ≤ R e… Expand

Analysis of conditional statistics obtained near the turbulent/non-turbulent interface of turbulent boundary layers

- Mathematics
- 2015

Abstract Direct numerical simulations of turbulent boundary layers (TBL) along a flat plate are used to study the properties of turbulent/non-turbulent (T/NT) interface of the TBL. The values of the… Expand

Reactive scalar field near the turbulent/non-turbulent interface in a planar jet with a second-order chemical reaction

- Physics
- 2014

The reactive scalar field near the turbulent/non-turbulent (T/NT) interface is analyzed using a direct numerical simulation (DNS) of a planar jet with an isothermal second-order chemical reaction A +… Expand

Geometrical aspects of turbulent/non-turbulent interfaces with and without mean shear

- Physics
- 2017

The geometry of turbulent/non-turbulent interfaces (TNTIs) arising from flows with and without mean shear is investigated using direct numerical simulations of turbulent planar jets (PJET) and shear… Expand

Scalar Transport Near the Turbulent/Non-Turbulent Interface in Reacting Compressible Mixing Layers

- Physics
- 2020

Direct numerical simulations of temporally evolving compressible reacting mixing layers with Schmidt number equal to one are performed to examine the transport of a conserved scalar across the… Expand

Experimental investigation of dissipation-element statistics in scalar fields of a jet flow

- Physics
- Journal of Fluid Mechanics
- 2013

Abstract We present a detailed experimental investigation of conditional statistics obtained from dissipation elements based on the passive scalar field $\theta $ and its instantaneous scalar… Expand

The vorticity versus the scalar criterion for the detection of the turbulent/non-turbulent interface

- Physics
- Journal of Fluid Mechanics
- 2014

Abstract Based on a direct numerical simulation (DNS) of a temporally evolving mixing layer, we present a detailed study of the turbulent/non-turbulent (T/NT) interface that is defined using the two… Expand

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