initialize(dealii::MatrixFree< dim, Number > const &matrix_free, dealii::AffineConstraints< Number > const &affine_constraints, ViscousOperatorData< dim > const &data, std::shared_ptr< Operators::ViscousKernel< dim, Number > > viscous_kernel) (defined in ExaDG::IncNS::ViscousOperator< dim, Number >)