Influence Of Advection Differencing Error Upon Large-Eddy Simulation Accuracy

Autor:	Tracy Haack, John W. Glendening
Rok vydání:	2001
Předmět:	Physics::Fluid Dynamics Physics Atmospheric Science Nonlinear system Computer simulation Meteorology Turbulence Planetary boundary layer Advection Wavenumber Mechanics Energy (signal processing) Large eddy simulation
Zdroj:	Boundary-Layer Meteorology. 98:127-153
ISSN:	1573-1472 0006-8314
Popis:	Accurate prediction of turbulent features by alarge-eddy simulation (LES) model requires accuratenumerical evaluation of the nonlinear advective terms. In the presence of a mean wind, use of second-order orfourth-order finite differencing produces large lossesof turbulent energy at high wavenumbers, an inaccuracyconsistent with idealized numerical properties ofthese schemes. The discrete differencing inaccuraciesalso affect the small wavenumber ``large eddy''structure and the horizontally-averaged turbulentquantities. With a high accuracy pseudospectraltechnique, this energy loss does not occur andspectral behaviour corresponds to filtered Kolmogorovtheory predictions out to the de-aliasing cutoffwavenumber. The inaccuracy of the finite differenceschemes is greatly ameliorated through a Galileantransformation of the advective term.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2216c730ab1e32c0e34962aefbcfe8f9 https://doi.org/10.1023/a:1018734205850 Zobrazit plný text záznamu Plný text ve formátu PDF