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- W1528038480 abstract "The high-level waste repository proposed for Yucca Mountain, Nevada, would be located in unsaturated, highly fractured, densely welded tuff. The spacing between fractures is sufficiently large relative to drift dimensions to render somewhat suspect predictions using continuum methods for simulating flow and energy transport. On the other hand, the spacing is sufficiently small to render standard discrete-fracture methods extremely computationally demanding. Using boundary integral approaches, discrete-fracture methodology is developed to overcome some of the limitations of standard computational methods. Fractures are discretized with standard finite volume methods, while each block between fractures is assumed to have piecewise-constant (although possibly time-varying) properties. With the assumption of piecewise-constant properties, the governing equation in the matrix blocks is transformed into a surface integral, obviating the need for a computational mesh within matrix blocks. Two formally equivalent alternative formulations may be used: discrete jump or multiple zone. Equations describing material-property changes, moving boiling fronts, and coupled fluid and energy transport in discrete fractures are presented, as well as a simple example demonstrating some effects of discrete fractures on unsaturated flow. Two-phase flow in a fracture system adds considerable complexity relative to single-phase flow, and constitutive relationships are still relatively undeveloped. The liquid phase has the least developed theory, although it is of primary interest at Yucca Mountain. Ongoing efforts to extend constitutive theory for flow in a rough-walled fracture are discussed here, describing a fracture surface using partially connected pits and plateaus. Computational issues involved with routing film flow through wide-aperture fracture intersections are also discussed." @default.
- W1528038480 created "2016-06-24" @default.
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- W1528038480 date "2000-01-01" @default.
- W1528038480 modified "2023-09-27" @default.
- W1528038480 title "A discrete-fracture boundary integral approach to simulating coupled energy and moisture transport in a fractured porous medium" @default.
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- W1528038480 doi "https://doi.org/10.1029/gm122p0267" @default.
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