In this paper, we present results on the noise radiated by a supersonic gas jet through a gas injection nozzle which is commonly used in cars powered by compressed natural gas. Direct aeroacoustic simulation results, provided by a discontinuous Galerkin solver for the unsteady compressible Navier Stokes equations, are presented. Due to its local formulation with high order accuracy and low dissipation and dispersion, it is well suited for both flow resolution and wave propagation. The discontinuous Galerkin scheme preserves these properties even on unstructured hybrid grids, allowing to mesh the complex threedimensional geometries. The scheme is fully parallelized and simulations are run on 2048 cores. We show that the sound radiation can be adequately predicted and that sound pressure level spectra are in good agreement with experimental data.

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