TimeExplicit in the COMSOL Multiphysics Programming Reference Manual.
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If the finite element discretization leads to a DAE, then its index must be 1 (see the Glossary). The algebraic equations are solved using a Fully Coupled solver. The frequency with which these algebraic equations are solved can be controlled with the Algebraic equations setting, which makes it possible to reduce the computational time. For example, this setting is useful to reduce the cost of solving a wave problem (discretized using the nodal discontinuous Galerkin method) coupled to an elliptic PDE (see the Glossary).
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