Airplane engines are loud – just ask anyone who lives near an airport. Increased air traffic from next-generation aircraft has the potential for even more disruptive noise. Researchers and engineers at NASA are working to reduce noise generated by turbofan engines, but each new design requires certification and testing to understand how much noise it will generate during takeoff and approach. The simulation is based on the Source Diagnostic Test fan, a simplified turbofan engine model used for p

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