I am trying to solve a system of 1st order linear partial differential equations with a constraint on two out of three of my dependent variables (to enforce population conservation). I am familiar with DAEs and the associated documentation, and I have built my PDE solver by discretizing my spatial …

How to solve PDAEs (incorporate mass matrix into PDE solver)

ChrisRackauckas February 28, 2023, 12:23pm 4

Is your DAE index 1? I.e., are all of your constraints functions of the algebraic variables?

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