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In various areas of interest, it is important to model, simulate and compute processes on surfaces. In fluid mechanics, a topic of increasing importance is the transport of mass, energy or momentum on phase interfaces. These processes are modelled by partial differential equations on the phase interface and therefore, on moving surfaces that may change rapidly with respect to geometry and topology. In the present work, a numerical framework for solving interfacial convection-diffusion problems based on a Discontinuous Galerkin method is established. In contrast to most traditional approaches, the method introduced here maintains the original Eulerian grid as well as an implicit representation of the interface, rather than establishing a Lagrangian, i.e. interfacial grid. An MPI parallelized and modular software package for the numerical approximation of interfacial transport problems by polynomials of arbitrary order is presented. Well-posedness of the problem and computational efficiency are achieved by a narrow band structure around the moving interface. A pseudo-timestepping method is provided by which extended quantities can be extrapolated to new cells in this dynamic Narrow Band while being accurately preserved on the interface. The method constructed is then used to investigate different interfacial transport problems with and without diffusion numerically.