Buffet boundary estimation using a harmonic balance method

In this work, the application of harmonic balance technique is demonstrated for transonic buffet cases. The method represents an alternative to time-marching simulations that are expensive complex flow Here applied on different test cases with inherently unsteady flows, i.e. two aerofoil configurations undergoing buffet. A gradient-based, variable time period used estimate frequency oscillation flows where it not know a priori. reduced computer costs respect marching allowed embed computation simple procedure boundary estimation. aim improve prediction coming from criteria based results steady computations, still popular in industry.