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A HLLC scheme for nonconservative hyperbolic problems.Application to turbidity currents with sediment transport

Published online by Cambridge University Press:  31 July 2012

Manuel Jesús Castro Díaz
Affiliation:
Dpto. de Análisis Matemático, Facultad de Ciencias, Universidad de Málga, Campus de Teatinos, s/n, 29071 Málaga, Spain. castor@anamat.cie.uma.es; pares@anamat.cie.uma.es
Enrique Domingo Fernández-Nieto
Affiliation:
Dpto. Matemática Aplicada I, ETS Arquitectura, Universidad de Sevilla, Avda. Reina Mercedes No. 2, 41012 Sevilla, Spain; edofer@us.es; gnarbona@us.es
Tomás Morales de Luna
Affiliation:
Dpto. de Matemáticas, Universidad de Córdoba, Campus de Rabanales, 14071 Córdoba, Spain; tomas.morales@uco.es
Gladys Narbona-Reina
Affiliation:
Dpto. de Matemáticas, Universidad de Córdoba, Campus de Rabanales, 14071 Córdoba, Spain; tomas.morales@uco.es
Carlos Parés
Affiliation:
Dpto. de Análisis Matemático, Facultad de Ciencias, Universidad de Málga, Campus de Teatinos, s/n, 29071 Málaga, Spain. castor@anamat.cie.uma.es; pares@anamat.cie.uma.es

Abstract

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The goal of this paper is to obtain a well-balanced, stable, fast, and robust HLLC-typeapproximate Riemann solver for a hyperbolic nonconservative PDE system arising in aturbidity current model. The main difficulties come from the nonconservative nature of thesystem. A general strategy to derive simple approximate Riemann solvers fornonconservative systems is introduced, which is applied to the turbidity current model toobtain two different HLLC solvers. Some results concerning the non-negativity preservingproperty of the corresponding numerical methods are presented. The numerical resultsprovided by the two HLLC solvers are compared between them and also with those obtainedwith a Roe-type method in a number of 1d and 2d test problems. This comparison shows that,while the quality of the numerical solutions is comparable, the computational cost of theHLLC solvers is lower, as only some partial information of the eigenstructure of thematrix system is needed.

Information

Type
Research Article
Copyright
© EDP Sciences, SMAI, 2012