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- I have worked through the basics of the FEM method in 2D with rectangular elements and now am trying to learn triangular elements but need a simple enough numerical example.

I have worked through the basics of the FEM method in 2D with rectangular elements and now am trying to learn triangular elements but need a simple enough numerical example. It seems triangular elements are far more complicated and also depend on the global coordinates thus each local stiffness matrix is different. At least that's my current understanding. If anyone can point me to a simple enough 2D problem worked out with triangular elements for a temperature problem I would be grateful. Simple is defined by a handful of elements and basically just involving temperature, not things like stress and strain. Also, it's mainly the assembly process I am struggling with especially when triangular elements are in different orientations or different sizes. Thanks.

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