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A Multiscale Pressure Splitting of the Shallow-Water Equations: I. Formulation and 1D Tests

✍ Scribed by Olivier Le Maı̂tre; Julia Levin; Mohamed Iskandarani; Omar M. Knio

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
544 KB
Volume
166
Category
Article
ISSN
0021-9991

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✦ Synopsis

Direct representation of the free surface in ocean circulation models leads to a number of computational difficulties that are due to the fast time scales associated with free-surface waves. These fast time scales generally result in severe time-step restrictions when the free surface is advanced using an explicit scheme and may result in large phase errors when the free surface is treated implicitly with a large time step. A multiple-scale analysis of the shallow-water equations is used to analyze this stiffness and to guide the construction of a computational methodology that overcomes the associated difficulties. Specifically, we explore a class of fractional step methods that utilize coarsened grids in the propagation of long-wave data. The behavior of the corresponding schemes is examined in detail in light of one-dimensional model problems, based on finite-difference or spectral-element discretizations.

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