A Hybrid Spectral/Finite-Volume Algorithm for Large-Eddy Simulation of Scalars in the Atmospheric Boundary Layer |
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| Authors: | Marcelo Chamecki Charles Meneveau Marc B. Parlange |
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| Affiliation: | (1) Department of Geography and Environmental Engineering and Center for Environmental and Applied Fluid Mechanics, Johns Hopkins University, Baltimore, MD, USA;(2) Department of Mechanical Engineering and Center for Environmental and Applied Fluid Mechanics, Johns Hopkins University, Baltimore, MD, USA;(3) School of Architecture, Civil, and Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland |
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| Abstract: | Pseudospectral methods are frequently used in the horizontal directions in large-eddy simulation of atmospheric flows. However, the same approach often creates unphysical oscillations for scalar fields if there are horizontal heterogeneities in the sources and/or sinks, as is usual in air pollution problems. A hybrid approach is developed to combine the use of pseudospectral representation of the velocity field and bounded finite-volumes for the scalar concentration. An interpolation scheme that yields a divergence-free interpolated velocity field is derived and implemented, and its importance is illustrated by two sample applications. |
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| Keywords: | Conservative velocity interpolation Divergence free Finite volumes Large-eddy simulation Passive scalars |
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