Numerical vs. turbulent diffusion in geophysical flow modelling

TitleNumerical vs. turbulent diffusion in geophysical flow modelling
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2008
AuthorsD'Isidoro, Massimo, Maurizi A., and Tampieri F.
JournalNuovo Cimento della Societa Italiana di Fisica C
Volume31
Pagination813-824
ISSN11241896
Abstract

Numerical advection schemes induce the spreading of passive tracers from localized sources. The effects of changing resolution and Courant number are investigated using the WAF advection scheme, which leads to a sub-diffusive process. The spreading rate from an instantaneous source is compared with the physical diffusion necessary to simulate unresolved turbulent motions. The time at which the physical diffusion process overpowers the numerical spreading is estimated, and is shown to reduce as the resolution increases, and to increase as the wind velocity increases. © Società Italians di Fisica.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-70350141534&doi=10.1393%2fncc%2fi2009-10347-2&partnerID=40&md5=1c26c5babe4ed092e564e12004de0c0f
DOI10.1393/ncc/i2009-10347-2