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	Volume 2, Issue 2 Pg 117 - 238 (October 2007)
	Volume 2, Issue 1 Pg 1 - 115 (July 2007)

Volume 1 (2007)

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Advances and Applications in Fluid Mechanics

at the flow rate ratio

and the Reynolds number

Measurements of passive scalar distributions in radial planes at various distances from the nozzle have been carried out by Laser Induced Fluorescence (LIF). Velocity fields have been measured using Laser Doppler Velocimetry (LDV). Calculations have been done with Large Eddy Simulation using a novel inflow generator and a clipping procedure proposed by the authors. Numerical and experimental results reveal the formation of the recurculation zone in a short distance behind the nozzle. The flow in the recirculation zone is highly unsteady and nearly periodic. The scalar field experiences long period temporal oscillations which are in nearly opposite temporal phase at symmetrical points with respect to the pipe centerline. Detailed analysis of vorticity and scalar fields obtained from LES calculations shows that the reason for such flow behaviour are coherent vortex structures appearing on the boundary between the jet and the coflow. They induce oscillating motions accross the pipe and transport the scalar against the main flow direction within the recirculation zone.

Advances and Applications in Fluid Mechanics
Volume 2, Issue 1, Pages 1 - 28 (July 2007)

LES SIMULATION AND MEASUREMENT OF SEPARATION FLOW PHENOMENA IN A CONFINED COAXIAL JET WITH LARGE INNER TO OUTER VELOCITY RATIO
Nikolai Kornev (Germany), Igor Tkatchenko (Germany), Valery Zhdanov (Germany), Egon Hassel (Germany) and Steffen Jahnke (Germany)

Abstract:
Structure and unsteady behaviour of the separation flow arising when an inner jet is injected from a nozzle of diameter d into outer coflow confined by a pipe of diameter D are studied using experimental and numerical methods. Investigations have been conducted for large inner to outer velocity ratio

at the flow rate ratio

and the Reynolds number

Keywords and phrases: confined jet, turbulent mixing, passive scalar, coherent structures, Large-Eddy simulation.

Communicated by Liang-Yin Chu

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