autopdex.SimState.add_local_subsystem

SimState.add_local_subsystem(key: str, local_dae: ~typing.Callable, fields: str | ~typing.List[str] | ~typing.Tuple[str, ...], root_solver: ~typing.Callable = <function newton_solver>)

Register a local (element-level) DAE subsystem for internal variables.

The subsystem is solved on demand from a model integrand via ModelContext.solve_local(key, ...) and is materialized in initialize(...).

Parameters:

• key – Unique, non-empty name used to invoke the subsystem.

• local_dae – Callable (q_fun, t, settings) defining the local residual/DAE.

• fields – Internal variable field name(s) the subsystem solves for. All must be registered as internal variables (not primary fields) and have a time integrator set via add_temporal_discretization(...).

• root_solver – Root solver for the local system (default: dae.newton_solver).