Draft: Weak plane models

Mehran Ghasabehrequested to merge
MehranGhasabeh/ogs-mg:WeakPlaneModels into master

Four different approaches to weak plane models are presented, and the numerical results are verified against analytical solutions. The jupyternotebook includes descriptions of both iterative and non-iterative implementations of weak plane models with orthogonal and non-orthogonal (oblique) sets of joints.

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