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- W1971361201 abstract "This work presents the application of an implicit large-eddy simulation (ILES) approach for the evaluation of aero-optical distortion in compressible turbulent flows. Flow fields are obtained by solving the full Navier-Stokes equations employing the FDL3DI solver, which utilizes a 6th-order compact scheme for spatial derivatives in conjunction with a very-high-order low-pass filter for regularization at high wavenumbers. Near-field optical aberration is characterized in terms of t he distortion of an initially planar wavefront propagating through the turbulent medium. Application to a compressible subsonic shear layer is considered as a canonical problem in order to investigate the dominant role of the large-scale coherent structures on the overall distortion. Forcing of the shear layer is found to promote regularization in the formation and convection of these structures at the expense of increased aberration due to the stronger density variations which are generated. Filtering of the computed fine-scale turbulent f eatures using the high-order low-pass operator confirms that most of the aberration is associated with the large -scale density variations within the vortex cores and in the region between the convecting vortices. The impact of high-frequency excitation appears promising since it delays the roll-up of the shear layer. This effect is examined for the more relevant resonant flow over a cavity wherein the formation of large-scale vortical structures is inhibited by application of high-frequency excitation." @default.
- W1971361201 created "2016-06-24" @default.
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- W1971361201 date "2008-01-07" @default.
- W1971361201 modified "2023-09-25" @default.
- W1971361201 title "Effect of Flow Excitation on Aero-Optical Aberration" @default.
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- W1971361201 doi "https://doi.org/10.2514/6.2008-1074" @default.
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