New Trends in Ensemble Forecast Strategy: Uncertainty Quantification for Coarse-Grid Computational Fluid Dynamics

Type Article
Date 2021-01
Language English
Author(s) Resseguier V.1, Li L.2, Jouan G.1, Dérian P.2, Mémin E.2, Chapron Bertrand3
Affiliation(s) 1 : Lab, SCALIAN, Espace Nobel, 2 Allée de Becquerel, Rennes, 35700, France
2 : Fluminance Group, Inria, Campus universitaire de Beaulieu, Rennes, 35042, France
3 : LOPS, Ifremer, Pointe du Diable, Plouzané, 29280, France
Source Archives Of Computational Methods In Engineering (1134-3060) (Springer Science and Business Media LLC), 2021-01 , Vol. 28 , N. 1 , P. 215-261
DOI 10.1007/s11831-020-09437-x
WOS© Times Cited 2
Abstract

Numerical simulations of industrial and geophysical fluid flows cannot usually solve the exact Navier–Stokes equations. Accordingly, they encompass strong local errors. For some applications—like coupling models and measurements—these errors need to be accurately quantified, and ensemble forecast is a way to achieve this goal. This paper reviews the different approaches that have been proposed in this direction. A particular attention is given to the models under location uncertainty and stochastic advection by Lie transport. Besides, this paper introduces a new energy-budget-based stochastic subgrid scheme and a new way of parameterizing models under location uncertainty. Finally, new ensemble forecast simulations are presented. The skills of that new stochastic parameterization are compared to that of the dynamics under location uncertainty and of randomized-initial-condition methods.

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