). It contains physics interfaces for the following sets of equations that apply under different conditions:). It contains physics interfaces for the following sets of equations that apply under different conditions:|
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The Darcy’s Law Interface describes low-velocity flows of one or more fluids.
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The Richards’ Equation Interface governs the wetting and drying of rocks or soils.
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The Multiphase Flow in Porous Media Interface, which combines low velocity flow with phase transport of multiple immiscible phases in a porous medium is described in the Multiphysics Interfaces and Couplings chapter.
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The Fracture Flow Interface is a variant of Darcy’s law that defines the flow along the interior boundaries representing fractures within a porous or solid medium.
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The Layered Darcy’s Law Interface describes low-velocity flow of fluids in layered materials (like layered soils, paperboard, composites, and so on) represented by boundaries. It is only available in 3D models and is only active on those boundaries where a layered material is defined.
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The Brinkman Equations Interface is intended for porous media high-velocity flows.
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The Free and Porous Media Flow, Brinkman Interface and The Free and Porous Media Flow, Darcy Interface combine free flow adjacent to porous domains.
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The Laminar Flow and Creeping Flow Interfaces use the Navier–Stokes equations (in which the inertia term is neglected in case of Creeping Flow) to describe free flows within a river or well, for example. The Laminar Flow interface is available with all COMSOL licenses.
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The Thin-Film and Porous Media Flow Interface couples the flow of a thin film of fluid described by Reynolds equation or modified Reynolds equation to low velocity flow in a porous medium governed by Darcy’s law.
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