Reynolds-Number Dependency of the Leading Edge Vortex on a Fast Pitch-up Flat Plate

We present a numerical study on the influence of the Reynolds-number on the lift enhancing effect of a leading edge vortex. Our approach is based on a combination of large-eddy simulations and the immersed boundary technique. We determine the influence of the leading edge vortex on the unsteady lift by simulating a fast pitch-up motion of the plate and studying the lift evolution after holding the flat plate fixed at an angle of attack. Our results suggest that an optimal Reynolds-number exists that maximizes the lift of the leading edge vortex, but that the lift-to-drag ratio is largely independent of the Reynolds-number above a Reynolds-number of Re c > 2000.

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“…[36][37][38][39] We have added the IB method to the solver and validated it on stationary and transient problems. 33,40,41…”

Section: Numerical Approachmentioning

confidence: 99%

Numerical study of the influence of the Reynolds-number on the lift created by a leading edge vortex

Zhang

Schlüter

2012

Physics of Fluids

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“…The dynamic LES sub-grid scale model of Germano et al [55] and Lilly [56] has been used, which does not require external constants. The code has so far been validated on a wide range of flow computations [57][58][59][60][61][62][63][64].…”

Section: Les -Jetcodementioning

confidence: 99%

Numerical study of trapped vortex combustors characteristics in small ramjets

Chen¹

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my current supervisor, who continuously provides me valuable suggestions and discussions during these years in many ways. I am also grateful to Dr. Simon Ching-Man Yu of Singapore Institute of Technology, my co-supervisor, for continuously providing me encouragement, guidance, discussions and caring in both research and personal life. Without their guidance, the research would not have been so enriching and fulfilling.

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