Wingtip Vortex Simulation by Using Nonequilibrium Eddy Viscosity Model

摘要

WINGTIP vortex is an important subject in fluid mechanics, asnit is involved inmany practical engineering problems that cannbe found, for example, in [1–4]. Thus, it has long been the subject ofnnumerous experimental and/or numerical investigations. Chigier andnCorsiglia [5] pioneered the experimental study of thewingtip vortex.nTheymeasured, by using hot-wire anemometry, thewingtip vortex ofna square-tipped rectangular wing up to a 12c downstream distance.nThe maximum axial velocity at the vortex core at x0n=c u0001u00020:25 wasn1:4U1. They showed that themaximumtangential velocity increasesnwith the angle of attack, while the vortex core radius remainsnunchanged. Green [6] and Green and Acosta [7] used double-pulsednholography to measure the instantaneous velocity distribution inntrailing vortices of a round-tipped rectangular wing. At a 10 degnangle of attack, the axial velocity at the vortex core was 1:6U1 atnx0n=c u0001 2:0. Chow et al. [8] used hot-wire and seven-hole probes tonmeasure the flow over and immediately downstream of a round-ntipped rectangular wing with a NACA0012 section at Rec u0001 4:6 u0003n106nand a 10 deg angle of attack. The measurement data of this studynwill be used as reference data in this work.