Effect of Initial Conditions on the Scalar Decay in Grid Turbulence at Low Rλ

Benaissa, A., Djenidi, L., Antonia, R. A. and Parker, R. (2007). Effect of Initial Conditions on the Scalar Decay in Grid Turbulence at Low Rλ. In: Peter Jacobs, Tim McIntyre, Matthew Cleary, David Buttsworth, David Mee, Rose Clements, Richard Morgan and Charles Lemckert, 16th Australasian Fluid Mechanics Conference (AFMC). , Gold Coast, Queensland, Australia, (914-918). 3-7 December, 2007.

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Author Benaissa, A.
Djenidi, L.
Antonia, R. A.
Parker, R.
Title of paper Effect of Initial Conditions on the Scalar Decay in Grid Turbulence at Low Rλ
Conference location Gold Coast, Queensland, Australia
Conference dates 3-7 December, 2007
Proceedings title 16th Australasian Fluid Mechanics Conference (AFMC)
Place of Publication Brisbane, Australia
Publisher School of Engineering, The University of Queensland
Publication Year 2007
Year available 2007
Sub-type Fully published paper
ISBN 978-1-864998-94-8
Editor Peter Jacobs
Tim McIntyre
Matthew Cleary
David Buttsworth
David Mee
Rose Clements
Richard Morgan
Charles Lemckert
Start page 914
End page 918
Total pages 5
Collection year 2007
Language eng
Abstract/Summary Decaying grid turbulence is considered at low Reynolds number (Rλ ~ 50) for different initial conditions. Three different grid geometries are used. Heat is injected via a mandoline at a distance of 1.5 M from the grid. The amount of heating is such that temperature may be treated as a passive scalar. A small contraction (1.36:1) is added at a distance of 11M downstream of the grid. The power-law exponents for the scalar variance are compared with those for the turbulent kinetic energy. These exponents depend on the grid geometry. For the isotropic dissipation rate 〈χ〉iso, the power-law exponent agrees with that inferred from the temperature variance transport equation. Restricting the range of validity of the decay law affects the magnitudes of the origin and decay exponent. Secondorder temperature structure functions collapse when the normalization is based on the local temperature variance and the Corrsin microscale but the asymptotic form of this collapse depends on the initial conditions.
Subjects 290000 Engineering and Technology
Keyword grid turbulence
Reynolds number
grid geometries
turbulent kinetic energy
isotropic dissipation rate
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
Collection: 16th Australasian Fluid Mechanics Conference
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Created: Thu, 20 Dec 2007, 10:15:59 EST by Bikash Das on behalf of School of Engineering