Pressure Distribution Prediction for Two-Dimensional Hydrofoils with Massive Turbulent Separation

Abstract

An automated numerical algorithm has been developed for the prediction of the pressure distribution on twodimensional noncavitating lifting hydrofoils, isolated or in cascade, even with massive turbulent flow separation. The only required inputs are the hydrofoil profile, the inlet flow angle, the cascade parameters, and the Reynolds Number. Satisfactory experimental verification of the algorithm has been achieved against the NACA 63-018 airfoil at 18° angle of attack, the NACA 65, 2-421 airfoil of 20° angle of attack, and the NASA GA(W)-1 airfoil at 21° angle of attack with turbulent separation locations up to 85% chord upstream of the trailing-edge. Only two iterations were required in the previous cases with a maximum computing time of 205 sec on the CDC 7600 system.