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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Chamecki, M., Meneveau, C. & Parlange, M.B. A Hybrid Spectral/Finite-Volume Algorithm for Large-Eddy Simulation of Scalars in the Atmospheric Boundary Layer. Boundary-Layer Meteorol 128, 473–484 (2008). https://doi.org/10.1007/s10546-008-9302-1
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DOI: https://doi.org/10.1007/s10546-008-9302-1