Three-dimensional euler solutions for axisymmetric and non-axisymmetric advanced propeller flows

Two numerical methods have recently been developed for the prediction of steady axisymmetric and unsteady non-axisymmetric advanced propeller flows respectively. A multistage Runge-Kutta time-stepping scheme with central differencing is used as the basic algorithm in both methods. The steady flow solver is explicit in time while the unsteady flow solver uses a fully implicit time discretisation. Efficient acceleration devices, typical of explicit steady-state schemes, are used with both methods to accelerate convergence. The steady flow solver is validated by comparing predictions with measurements for the axisymmetric subsonic flow around a two-bladed propeller. Results are also presented from steady and time-dependent calculations of the axisym-metric and non-axisymmetric transonic flow around a six-bladed advanced propeller.