Numerical investigation of tail buffet on F-18 aircraftNumerical investigation of vortex induced tail buffet is conducted on the F-18 aircraft at high angles of attack. The Reynolds-averaged Navier-Stokes equations are integrated using a time-accurate, implicit procedure. A generalized overset zonal grid scheme is used to decompose the computational space around the complete aircraft with faired-over inlet. A weak coupling between the aerodynamics and structures is assumed to compute the structural oscillation of the flexible vertical tail. Time-accurate computations of the turbulent flow around the F-18 aircraft at 30 degrees angle of attack show the surface and off-surface flowfield details, including the unsteadiness created by the vortex burst and its interaction with the vertical twin tail which causes the tail buffet. The effect of installing a LEX fence on modifying the vortex structure upstream of the tail is also examined.
Document ID
19920062904
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rizk, Yehia M. (NASA Ames Research Center Moffett Field, CA, United States)
Guruswamy, Guru P. (NASA Ames Research Center Moffett Field, CA, United States)
Gee, Ken (MCAT Institute Moffett Field, CA, United States)