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A Study on Aerodynamic Properties of Two-Dimensional Rectangular Prism in Various Angles of Attack  

송근택 (한국해양대학교 대학원 기계공학과)
김유택 (한국해양대학교 해사대학 기관시스템공학부)
이영호 (한국해양대학교 공과대학 기계·정보공학부)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.26, no.4, 2002 , pp. 485-492 More about this Journal
Abstract
The present study is aimed to reveal macroscopic aerodynamic characteristics of two-dimensional rectangular prisms with three aspect ratios(D/H=1, 2 and 3) and six angles of attack($0^{circ}, 10^{circ}, 13.5^{circ}, 20^{circ}, 30^{circ} and 45^{\circ}$). The Reynolds number is fixed as $1\times10^4$. The SOLA-based revised finite difference method for the conservation form on irregular grid was adopted as a new numerical method. Instantaneous flow patterns at $45^{\circ}$ in case of D/H=2 and D/H=3 show larger asymmetric wake development which is closely related to the sharp decrease of drag coefficients at higher angles of attack range. Vorticity propagation into enlarged wake region is conjectured to be responsible for this phenomenon. The Strouhal number is found to be sensitive to the angle of attack at higher aspect ratios(D/H=2 and 3).
Keywords
Rectangular Prism; Aspect Ratio; Angle of Attack; Finite Difference Method; Irregular Grid;
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