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Implicit Approximation
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Implicit approximation can be solved using: Point iteration (G/S, SOR) Direct (matrix) solution Combination of matrix soln and iteration
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Examples of solution techniques that combine matrix solution with iteration: IADI (see chapter 5 of W&A) SSOR* SIP* PCG2* *Used in MODFLOW
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General 3D equation used in MODFLOW i-1 i i+1 Block centered grid xixi x i-1/2 x i+1/2
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K values in the space between nodes is calculated using the harmonic mean
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The default boundary condition is no flow.
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Types of Layers (LAYCON array) Confined Unconfined Convertible (Useful to think in terms of a layer transmissivity.)
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Conductance
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