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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 3: Water and Carbon: Climate Change Impact : Large eddy simulation of contaminant dispersion in a boundary layer
Large eddy simulation of contaminant dispersion in a boundary layer
Author : Keisuke Asakura1 , Akihiko Nakayama1
The concentration field of passive contaminant released in a turbulent boundary layer has been computed by large-eddy simulation (LES) method. The inflow boundary layer with turbulent fluctuations of velocity and temperature was generated using a method similar to that of Lund et al.(1998) and Kong et al. (2000)) of recycling velocity and temperature fluctuations in a driver section placed upstream of the main calculation region. A few different combinations of sub-grid scale (SGS) models for the momentum transfer and the heat and passive scalar fluxes were examined. It was found that the quality of prediction of the diffusion of passive contaminant depends on the accuracy of the calculation of the velocity fluctuations. Differences among various sub-grid models are found to be small but the Mixed-time scale model (MTS) for the sub-grid stresses combined with the dynamic eddy diffusion model was found to give the best results of concentration distribution.
File Size : 610,128 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 3: Water and Carbon: Climate Change Impact
Date Published : 01/07/2011
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