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NUMERICAL ENTROPY PRODUCTION AS SMOOTHNESS INDICATOR FOR SHALLOW WATER EQUATIONS

Published online by Cambridge University Press:  28 November 2019

SUDI MUNGKASI*
Affiliation:
Department of Mathematics, Faculty of Science and Technology, Sanata Dharma University, Yogyakarta, Indonesia email sudi@usd.ac.id
STEPHEN GWYN ROBERTS
Affiliation:
Mathematical Sciences Institute, College of Physical and Mathematical Sciences, Australian National University, Canberra, Australia email stephen.roberts@anu.edu.au

Abstract

The numerical entropy production (NEP) for shallow water equations (SWE) is discussed and implemented as a smoothness indicator. We consider SWE in three different dimensions, namely, one-dimensional, one-and-a-half-dimensional, and two-dimensional SWE. An existing numerical entropy scheme is reviewed and an alternative scheme is provided. We prove the properties of these two numerical entropy schemes relating to the entropy steady state and consistency with the entropy equality on smooth regions. Simulation results show that both schemes produce NEP with the same behaviour for detecting discontinuities of solutions and perform similarly as smoothness indicators. An implementation of the NEP for an adaptive numerical method is also demonstrated.

Type
Research Article
Copyright
© 2019 Australian Mathematical Society

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