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Structure of the temperature field downwind of a line source in grid turbulence

Published online by Cambridge University Press:  21 April 2006

H. Stapountzis ,
B. L. Sawford ,
J. C. R. Hunt  and
R. E. Britter
H. Stapountzis
Affiliation:
Department of Engineering, University of Cambridge, Cambridge CB2 1PZ Present address: University of Thessaloniki, Box 443, Greece 54006.
B. L. Sawford
Affiliation:
CSIRO, Division of Atmospheric Research, Private Bag No. 1, Mordialloc, Victoria, 3195, Australia
J. C. R. Hunt
Affiliation:
Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge CB3 9EW
R. E. Britter
Affiliation:
Department of Engineering, University of Cambridge, Cambridge CB2 1PZ
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Abstract

A Lagrangian stochastic model is used in conjunction with detailed wind-tunnel measurements to examine the structure and development of the temperature field behind a line source in grid turbulence. It is shown that on the scale of these experiments molecular diffusion and viscosity have an important influence on temperature fluctuations (particularly on the intensity of these fluctuations) and must be explicitly modelled. The model accounts for a wide range of the measured properties of the temperature field and provides a unified treatment of temperature fluctuations through all stages of the development of the temperature field. This development is discussed in terms of a simple physical picture in which the hot plume is initially smooth and is moved about bodily by the turbulence, but gradually develops increasing internal structure or patchiness as it grows with distance downstream until a self-similar state is reached in which this internal structure maintains the temperature fluctuations.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 165 , April 1986 , pp. 401 - 424
Copyright
© 1986 Cambridge University Press

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