- solve_typeconsistentThe way to solve the system. A 'consistent' solve uses the full mass matrix and actually needs to use a linear solver to solve the problem. 'lumped' uses a lumped mass matrix with a simple inversion - incredibly fast but may be less accurate. 'lump_preconditioned' uses the lumped mass matrix as a preconditioner for the 'consistent' solveDefault:consistent C++ Type:MooseEnum Controllable:No Description:The way to solve the system. A 'consistent' solve uses the full mass matrix and actually needs to use a linear solver to solve the problem. 'lumped' uses a lumped mass matrix with a simple inversion - incredibly fast but may be less accurate. 'lump_preconditioned' uses the lumped mass matrix as a preconditioner for the 'consistent' solve 
- use_constant_massFalseIf set to true, will only compute the mass matrix in the first time step, and keep using it throughout the simulation.Default:False C++ Type:bool Controllable:No Description:If set to true, will only compute the mass matrix in the first time step, and keep using it throughout the simulation. 
ActuallyExplicitEuler
This time integrator is an implementation of forward/explicit Euler based on ExplicitTimeIntegrator, which avoids a nonlinear solve.
Input Parameters
- control_tagsAdds user-defined labels for accessing object parameters via control logic.C++ Type:std::vector<std::string> Controllable:No Description:Adds user-defined labels for accessing object parameters via control logic. 
- enableTrueSet the enabled status of the MooseObject.Default:True C++ Type:bool Controllable:No Description:Set the enabled status of the MooseObject.