Michael S. Torok

Navier-Stokes/Full Potential/Free-Wake Method for Rotor Flows

A technique for modeling unsteady three-dimensional compressible viscous e ow over lifting rotors in hover and forward e ight is described. The e ow solver has three modules: 1 ) a compressible Navier› Stokes solver for modeling the viscous e ow over the rotor and the rotor near wake; 2 ) a compressible potential e ow solver for modeling the inviscid, isentropic potential e ow regions far away from the rotor, and 3) a Lagrangian model for capturing and convecting the rotor wake once it leaves the Navier› Stokes domain. Results are presented for viscous e ow over a two-bladed untwisted rotor and a UH-60A rotor in hover. Good agreement is found with measurements.