Perturbing the inflow condition in shallow mixing layer experiments

Shallow Flows ◽  
2004 ◽  
pp. 95-102
Author(s):  
Wim Uijttewaal ◽  
Michel de Nijs ◽  
Bram C van Prooijen
Keyword(s):  
Mixing Layer ◽  
Inflow Condition

scholarly journals Mixing and combustion at low heat release in large eddy simulations of a reacting shear layer

2021 ◽  
Author(s):  
J. X. Huang ◽  
W. A. McMullan
Keyword(s):  
Probability Density Function ◽  
Heat Release ◽  
Shear Layer ◽  
Probability Density ◽  
Density Function ◽  
Temperature Rise ◽  
Mixing Layer ◽  
Large Eddy ◽  
Inflow Condition ◽  
The Mean

AbstractIn this paper, the mixing and combustion at low-heat release in a turbulent mixing layer are studied numerically using large eddy simulation. The primary aim of this paper is to successfully replicate the flow physics observed in experiments of low-heat release reacting mixing layers, where a duty cycle of hot structures and cool braid regions was observed. The nature of the imposed inflow condition shows a dramatic influence on the mechanisms governing entrainment, and mixing, in the shear layer. An inflow condition perturbed by Gaussian white noise produces a shear layer which entrains fluid through a nibbling mechanism, which has a marching scalar probability density function where the most probable scalar value varies across the layer, and where the mean-temperature rise is substantially over-predicted. A more sophisticated inflow condition produced by a recycling and rescaling method results in a shear layer which entrains fluid through an engulfment mechanism, which has a non-marching scalar probability density function where a preferred scalar concentration is present across the thickness of the layer, and where the mean-temperature rise is predicted to a good degree of accuracy. The latter simulation type replicates all of the flow physics observed in the experiment. Extensive testing of subgrid-scale models, and simple combustion models, shows that the WALE model coupled with the Steady Laminar Flamelet model produces reliable predictions of mixing layer diffusion flames undergoing with fast chemistry.

Ignition of a reactive mixing layer

1999 ◽  
Vol 96 (6) ◽  
pp. 1016-1021 ◽  
Author(s):  
C. Nicoli ◽  
P. Haldenwang ◽  
B. Denet
Keyword(s):  
Mixing Layer ◽  
Reactive Mixing

HEAT AND MOMENTUM TRANSFER BY VORTEX IN MIXING LAYER

1998 ◽  
Author(s):  
A. Jazdauskas ◽  
R. Slezas ◽  
Anupras Slanciauskas ◽  
Algis Dziugys
Keyword(s):  
Momentum Transfer ◽  
Mixing Layer ◽  
Heat And Momentum Transfer

Numerical simulation of sound generated by vortex pairing in a mixing layer

AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 2210-2218 ◽  
Author(s):  
Christopher Bogey ◽  
Christopher Bailly ◽  
Daniel Juve
Keyword(s):  
Numerical Simulation ◽  
Mixing Layer ◽  
Vortex Pairing
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