The ability to predict acoustic scattering from hard surface reflections in the vicinity of an exhausting jet is important to attempts at predicting the spatial effects of various engine and nozzle configurations. A time-domain equivalent source method is presented similar to Lee's method for predicting acoustic scattering due to hard surface reflections using acoustic gradient predictions from the G1A formulation. In contrast to Lee's method, the approach proposed here involves using source and control points that are coincident, leading to improvements in performance for some geometries. The most advantageous case appears to be for planar surfaces, where interaction between sources is avoided. Validation cases considered include a series of planar segments for analytical validation as well as cases to validate the use of the G1A inputs in connection with the our proposed method, and a series of scattering cases using an acoustic data surface as input to the model.
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