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Predicting flow reversals in chaotic natural convection using data assimilation Cover

Predicting flow reversals in chaotic natural convection using data assimilation

Open Access
|Dec 2012

Abstract

A simplified model of natural convection, similar to the Lorenz system, is compared to computational fluid dynamics simulations of a thermosyphon in order to test data assimilation (DA) methods and better understand the dynamics of convection. The thermosyphon is represented by a long time flow simulation, which serves as a reference ‘truth’. Forecasts are then made using the Lorenz-like model and synchronised to noisy and limited observations of the truth using DA. The resulting analysis is observed to infer dynamics absent from the model when using short assimilation windows. Furthermore, chaotic flow reversal occurrence and residency times in each rotational state are forecast using analysis data. Flow reversals have been successfully forecast in the related Lorenz system, as part of a perfect model experiment, but never in the presence of significant model error or unobserved variables. Finally, we provide new details concerning the fluid dynamical processes present in the thermosyphon during these flow reversals.

Language: English
Page range: 17598 - 17598
Submitted on: Aug 26, 2011
Published on: Dec 1, 2012
Published by: Stockholm University Press
In partnership with: Paradigm Publishing Services

© 2012 Kameron Decker Harris, El Hassan Ridouane, El Hassan Ridouane, Darren L. Hitt, Christopher M. Danforth, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.