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Computational aerodynamic analyses of rotorcraft main rotor blades areperformed in both hover and forward flight. The open-source SU2 code is usedfor rotor performance prediction. The core of the code is the set of RANSequations, which are solved for determining the flow. In hover, bothsteady-state and time-accurate modelling techniques of varying complexity areused and assessed. Simulation specific parameters which have a significantinfluence on the solution are also addressed. In forward flight, the code isdeveloped to include the main rotor blade kinematics which is a prerequisitefor modelling a trimmed rotor. Two databases are used for the validation of therotor performance prediction. The renowned Caradonna-Tung experimental tests ofa model rotor are used to evaluate the pressure distribution along the bladeduring hover. The extensive aerodynamic and aeroacoustic data survey of theAH-1G Cobra helicopter is used to assess the pressure distribution at differentadvancing and retreating azimuth angles during forward flight. The predictioncapabilities of the solver in terms of rotor performance are demonstrated andare overall in good agreement with the measured data.

Development and Preliminary Assessment of the Open-Source CFD toolkit SU2 for Rotorcraft Flows