ON THE CONVECTIVE AND ABSOLUTE NATURE OF INSTABILITIES IN FINITE-DIFFERENCE NUMERICAL SIMULATIONS OF OPEN FLOWS

Authors
COSSU C LOISELEUX T
Citation
C. Cossu et T. Loiseleux, ON THE CONVECTIVE AND ABSOLUTE NATURE OF INSTABILITIES IN FINITE-DIFFERENCE NUMERICAL SIMULATIONS OF OPEN FLOWS, Journal of computational physics (Print), 144(1), 1998, pp. 98-108
Citations number
15
Categorie Soggetti
Computer Science Interdisciplinary Applications","Physycs, Mathematical","Computer Science Interdisciplinary Applications","Physycs, Mathematical
Journal title
Journal of computational physics (Print) → ACNP
ISSN journal
00219991
Volume
144
Issue
1
Year of publication
1998
Pages
98 - 108
Database
ISI
SICI code
0021-9991(1998)144:1<98:OTCAAN>2.0.ZU;2-C
Abstract
In numerical simulations of unstable flows the absolute or convective nature of the instability can be modified by numerical effects. We int roduce a convective/absolute analysis of the dispersion relations asso ciated with discretized operators. This analysis leads to conditions o n the discretization parameters in order to avoid numerical transition from absolute to convective instability and vice versa. In numerical simulations of non-parallel flows, local numerical transitions, of the kind described in this paper, could lead to the wrong global dynamics . (C) 1998 Academic Press.