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Numerical simulations of helicopter aerodynamics and acoustics. (English) Zbl 0854.76068
Summary: We demonstrate several new methods for computing acoustic signals from helicopter rotors in hover and forward flight. Aearodynamic and acoustic solutions in the near field are computed with two different finite-volume flow solvers for the Euler equations. A solution-adaptive unstructured-grid Euler solver models a rotor in hover while a more conventional structured-grid solver is used for forward flight calculations. A nonrotating cylindrical surface is then placed around the entire rotor system. This surface moves subsonically with the rotor hub in forward flight. The finite-volume solution is interpolated onto this cylindrical surface at every time step, and a Kirchhoff integration propagates the acoustic signal to the far field. Results from the combined finite-volume/Kirchhoff method offer high accuracy with reasonable computer resource requirements.

76M25 Other numerical methods (fluid mechanics) (MSC2010)
76Q05 Hydro- and aero-acoustics
Full Text: DOI
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