LARGE EDDY SIMULATION OF JET IN CROSS FLOW

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LARGE EDDY SIMULATION OF JET IN CROSS FLOW
Background
Large eddy simulation (LES) is used to solve
turbulent flows. LES treats turbulence as 3-D
unsteady flow and resolves large flow structures
while modelling the effect of smaller structures.
Objective
LES is being used to study the interaction of an
inclined jet in a cross flow. Effect of flow
interaction on scalar transport is being studied.
Coherent structures of jet in cross flow with
stream-wise vorticity contours (top) Laminar
Re2000, (bottom) Turbulent Re12000.
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Research Carried Out
Using an in-house developed code, the flow field
has been calculated and used to extract vorticity
and coherent structures to reveal the underlying
flow physics.
Instantaneous stream-wise vorticity at different
y-z planes.
Key Findings
Hair pin structures are the main feature of the
jet. In the case of turbulent flow there is a
strong interaction between the jet and main
stream. The average vorticity field shows a
counter rotating vortex pair.
Time averaged stream-wise vorticity and counter
rotating vortex pair at x5D.