A micro/macro parallel-in-time (parareal) algorithm applied to a climate model with discontinuous non-monotone coefficients and oscillatory forcing.

Samaey, Giovanni and Slawig, Thomas (Submitted) A micro/macro parallel-in-time (parareal) algorithm applied to a climate model with discontinuous non-monotone coefficients and oscillatory forcing. Open Access Applied Numerical Mathematics .

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Abstract

We present the application of a micro/macro parareal algorithm for a 1-D energy balance climate model with discontinuous and non-monotone coefficients and forcing terms. The micro/macro parareal method uses a coarse propagator, based on a (macroscopic) 0-D approximation of the underlying (microscopic) 1-D model. We compare the performance of the method using different versions of the macro model, as well as different numerical schemes for the micro propagator, namely an explicit Euler method with constant stepsize and an adaptive library routine. We study convergence of the method and the theoretical gain in computational time in a realization on parallel processors. We show that, in this example and for all settings, the micro/macro parareal method converges in fewer iterations than the number of used parareal subintervals, and that a theoretical gain in performance of up to 10 is possible.

Document Type: Article
Keywords: Parallel-in-time algorithm; micro/macro parareal algorithm; energy balance climate model; nonlinear partial differential equation
Research affiliation: Kiel University
Refereed: Yes
Open Access Journal?: No
ISSN: 0168-9274
Related URLs:
Projects: PalMod
Date Deposited: 14 Sep 2018 08:42
Last Modified: 14 Sep 2018 08:42
URI: http://oceanrep.geomar.de/id/eprint/44300

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