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Simulation of a Round Jet and a Plume in a Regional Atmospheric Model

Bhat, GS and Krothapalli, A (2000) Simulation of a Round Jet and a Plume in a Regional Atmospheric Model. In: Monthly Weather Review, 128 (12). pp. 4108-4117.

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The mean flow characteristics of a turbulent round jet and a plume are simulated in a high-resolution regional atmospheric model. The model used for the study is the Advanced Regional Prediction System (ARPS). It is observed that the predicted flow characteristics are very sensitive to the turbulence closure scheme used. Among the three closure options in ARPS, namely, the constant eddy viscosity scheme, the Smagorinsky diagnostic closure, and the 1.5-order total kinetic energy scheme, the constant eddy viscosity scheme predicts the jet characteristics in better agreement with experiments. For the plume, all three schemes are unsatisfactory. It is shown that a modification of the constant eddy viscosity scheme incorporating a length-scale variation as suggested by theory predicts plume characteristics in good agreement with experiments. The simulations are carried out at one fixed grid- box size and flow inlet conditions; extending the present simulation results to other cases is discussed.

Item Type: Journal Article
Publication: Monthly Weather Review
Publisher: American Meteorological Society
Additional Information: Copyright for this article belongs to American Meteorological Society.
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 16 Sep 2004
Last Modified: 13 Jan 2012 08:27
URI: http://eprints.iisc.ac.in/id/eprint/1903

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