currently the specification of a time-dependent variable cues EquationSystem to insert backward-difference formulae and spit out a homogeneous list of effectively algebraic equations for a backward-Euler solve.
for compatibility with off-the-shelf dae solvers, should have an option to express manifest time dependence more explicit as a DAE, with a separate list of ODEs and algebraic equations. should be implemented at the EquationSystem level.
currently the specification of a time-dependent variable cues EquationSystem to insert backward-difference formulae and spit out a homogeneous list of effectively algebraic equations for a backward-Euler solve.
for compatibility with off-the-shelf dae solvers, should have an option to express manifest time dependence more explicit as a DAE, with a separate list of ODEs and algebraic equations. should be implemented at the EquationSystem level.