Please use this identifier to cite or link to this item: http://hdl.handle.net/10593/13888
Title: Examples of numerical simulations of two- dimensional unsaturated flow with VS2DI code using different interblock conductivity averaging schemes
Authors: Szymkiewicz, Adam
Tisler, Witold
Burzyński, Kazimierz
Keywords: numerical modelling
Richards equation
hydraulic conductivity
Issue Date: Sep-2015
Publisher: Instytut Geologii UAM
Citation: Geologos, 2015, 21, 3. s.161-167
Abstract: Flow in unsaturated porous media is commonly described by the Richards equation. This equation is strongly nonlinear due to interrelationships between water pressure head (negative in unsaturated conditions), water content and hydrau- lic conductivity. The accuracy of numerical solution of the Richards equation often depends on the method used to estimate average hydraulic conductivity between neighbouring nodes or cells of the numerical grid. The present paper discusses application of the computer simulation code VS2DI to three test problems concerning infiltration into an ini- tially dry medium, using various methods for inter-cell conductivity calculation (arithmetic mean, geometric mean and upstream weighting). It is shown that the influence of the averaging method can be very large for coarse grid, but that it diminishes as cell size decreases. Overall, the arithmetic average produced the most reliable results for coarse grids. Moreover, the difference between results obtained with various methods is a convenient indicator of the adequacy of grid refinement.
URI: http://hdl.handle.net/10593/13888
ISBN: 978-83-232187-4-6
ISSN: 1426-8981
Appears in Collections:Geologos, 2015, 21, 3

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