F-16XL Hybrid Reynolds-Averaged Navier-Stokes/Large Eddy Simulation on Unstructured Grids

Journal of Aircraft
Michael A ParkAlaa Elmiligui

Abstract

The Cranked Arrow Wing Aerodynamics Program, International (CAWAPI) investigation is continued with the FUN3D and USM3D flow solvers to fuse flight test, wind tunnel test, and simulation of swept wing aerodynamic features. Simulations of a low speed, high angle of attack condition are compared. Detached Eddy Simulation (DES), Modified Delayed Detached Eddy Simulation (MDDES), and the Spalart-Allmaras (SA) RANS model. Isosurfaces of Q criterion show the development of coherent primary and secondary vortices on the upper surface of the wing that spiral, burst, and commingle. Mean DES and MDDES pressures better predict the flight test measurements than SA model predictions, especially on the outer wing section. The USM3D simulations predicted many sharp tones in volume point pressure spectra with low broadband noise and The FUN3D simulations predicted more broadband noise with weaker tones. Spectra of the volume points near the outer wing leading-edge was primarily broadband for both codes. Time-averaged forces are very similar between FUN3D simulations and and similar between USM3D simulations, but FUN3D predicts slightly higher lift and lower drag than USM3D. There is more variation in the pitching moment predictions. Spectra of...Continue Reading

Software Mentioned

DES
TetrUSS ( Tetrahedral Unstructured Software System )
USM3D
CAWAPI
MDDES
SA
FUN3D
R
HRLES FUN3D

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