Primary Variables

src/state/evaluators/EvaluatorPrimary.hh

An evaluator with no dependencies that serves as the primary variable to be solved for by a PK. Note that users almost never are required to write an input spec for these – they are controlled by the PK and therefore the input spec for this evaluator is written by that PK.

“evaluator type” = “primary variable”

evaluator-primary-variable-spec

• “tag” [string] optional Typically this is not set by the user, but implied by either the requester or by a fully qualified variable name (e.g. pressure@NEXT enforces that, on construction, “tag” = “NEXT”.