Coupled Fluid Flow in Energy, Biology and Environmental Research

Book Series: Progress in Computaional Physics (PiCP)

Volume 2

by

Matthias Ehrhardt

DOI: 10.2174/97816080525471120101
eISBN: 978-1-60805-254-7, 2012
ISBN: 978-1-60805-691-0
ISSN: 1879-4661 (Print)



Indexed in: EBSCO, Ulrich's Periodicals Directory.

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Numerical Methods for Subsurface Flows and Coupling with Surface Runoff

- Pp. 32-41 (10)

P. Sochala and A. Ern

Abstract

Robust and accurate schemes are proposed to couple subsurface and overland flows by enforcing the continuity of the normal flux and the pressure. Richards’ equation governing the subsurface flow is discretized using a Backward Differentiation Formula in time and a symmetric interior penalty Discontinuous Galerkin method in space. The kinematic wave equation governing the overland flow is discretized using a Godunov scheme. Both schemes are individually mass conservative and can be used within coupling algorithms that ensure overall mass conservation owing to a specific design of the interface fluxes in the multi-step case. For field drainage problems, we also propose a method for representing drain tubes using Signorini type conditions. Numerical results are presented to illustrate the performances of the proposed algorithms.

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