initialize(dealii::MatrixFree< dim, Number > const &matrix_free, dealii::AffineConstraints< Number > const &affine_constraints, ConvectiveOperatorData< dim > const &data, std::shared_ptr< Operators::ConvectiveKernel< dim, Number > > kernel) (defined in ExaDG::IncNS::ConvectiveOperator< dim, Number >)