Thoughts on functional dependencies of boundary conditions and forcing functions
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Harish Narayanan
I think it will be useful to allow for boundary conditions (Dirichlet, Neumann) and body forces to be functions of position (x), solution fields (u) and time (t). Currently, twist allows for the magic variables (x, t) in the definition of expressions used for boundary conditions/body forces. Flow allows for (x).
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It will be useful to allow for solution variables as part of the definition of functions because this easily allows one to pose interesting boundary value problems (e.g., a bouncing ball). Thoughts on how to implement this go on this whiteboard, and I am also pondering how this affects the linearisation of nonlinear problems.
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