Godunov Mixed Methods on triangular grids has been shown to be an effective tool for the solution of the two-dimensional advection-dispersion equation. The method is based on the discretization of the dispersive flux by means of the mixed hybrid finite element approach, while a high resolution Godunov-like finite volume scheme discretizes advection. The two techniques are combined together through a time-splitting algorithm that achieves formal second order accuracy if a corrective term is added in the finite volume stencil. In this paper we develop and study the extension of this approach to three dimensions employing tetrahedral elements and a fully 3D limiter. The numerical characteristics of the proposed method will be studied both theoretically and numerically using simple test problems.
Three Dimensional Godunov Mixed Methods on tetrahedra for the advection-dispersion equation
MAZZIA, ANNAMARIA;PUTTI, MARIO
2002
Abstract
Godunov Mixed Methods on triangular grids has been shown to be an effective tool for the solution of the two-dimensional advection-dispersion equation. The method is based on the discretization of the dispersive flux by means of the mixed hybrid finite element approach, while a high resolution Godunov-like finite volume scheme discretizes advection. The two techniques are combined together through a time-splitting algorithm that achieves formal second order accuracy if a corrective term is added in the finite volume stencil. In this paper we develop and study the extension of this approach to three dimensions employing tetrahedral elements and a fully 3D limiter. The numerical characteristics of the proposed method will be studied both theoretically and numerically using simple test problems.Pubblicazioni consigliate
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