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    Wyświetlanie 1-3 z 3
    Tytuł:
    Calculating effective conductivity of heterogeneous soils by homogenization
    Autorzy:
    Szymkiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/241053.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    effective conductivity
    soil heterogeneity
    groundwater flow
    homogenization
    Opis:
    The paper concerns effective conductivity of a heterogeneous soil composed of two materials characterized by different hydraulic conductivities. According to the homogenization theory the effective conductivity is obtained from the solution of an elliptic equation for a single representative elementary volume. A numerical algorithm to solve this equation is described. Examples of calculations for periodic media with inclusions of various shapes are presented. Influence of volumetric fraction, arrangement, continuity and conductivity ratio of the two materials on the effective conductivity is investigated. Numerical results are compared with some analytical estimations available in the literature.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2005, 52, 2; 111-130
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Simulation of One-Dimensional Two-Phase Flow in Porous Media
    Autorzy:
    Szymkiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/241426.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    two-phase flow
    porous media
    numerical methods
    Opis:
    The flow of two immiscible fluids in porous media is described by two coupled non-linear partial differential equations of the parabolic type. In this paper a numerical algorithm to simulate one-dimensional two-phase flow is presented. Cell-centered finite volume method and a generalized two-level scheme with weighting parameter are applied for the discretization in space and time, respectively. The performance of the algorithm is tested for different values of the weighting parameter in the time-discretization scheme and for various methods of approximation of the average conductivities between two adjacent gridblocks. The results are compared with an analytical solution for the horizontal flow and with a reference numerical solution performed on a dense grid for the vertical flow.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2007, 54, 2; 117-136
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Modeling of Water Flow in Expansive Soils with Simplified Description of Soil Deformation
    Autorzy:
    Michalski, S.
    Szymkiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/241343.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    expansive soils
    unsaturated flow
    hydro-mechanical coupling
    root water uptake
    Opis:
    In this paper we describe a numerical model of transient water flow in unsaturated expansive soils and the resulting soil volume change. The unsaturated flow equation is solved in a 2D domain using a finite-volume method and an explicit time discretization scheme. Strains in the soil mass are calculated by two simplified approaches, assuming that the strain state is either 1D (in the vertical direction only) or 2D with equal strains in horizontal and vertical directions. The model is applied to two cases described in the literature, in which the strains were computed from the solution of the stress equilibrium equation. It is shown that the simplified methods give results which are reasonably close to the more complex approach based on the equilibrium equations. The proposed model can be used to predict time-varying soil shrinkage and swelling caused by natural and anthropogenic factors.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2018, 65, 4; 301-313
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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