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

• المؤلفون الرئيسيون: Zhang, Xiaoqin., Schlüter, Jörg U.
• مؤلفون آخرون: School of Mechanical and Aerospace Engineering
• التنسيق: مقال
• اللغة: English
• منشور في: 2013
• الموضوعات: DRNTU::Engineering::Mechanical engineering
• الوصول للمادة أونلاين: https://hdl.handle.net/10356/106256; http://hdl.handle.net/10220/16627
• المؤسسة: Nanyang Technological University

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 Rec > 2000.