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http://dx.doi.org/10.3744/SNAK.2002.39.3.028

Numerical Simulation of Turbulent Flow around 2-D Airfoils in Ground Effect  

H.H. Chun (부산대학교 조선해양공학과(기계기술연구소))
R.H. Chang (부산대학교 조선해양공학과)
M.S. Shin (한국해양연구원 해양시스템안전연구소 해양운송시스템개발본부)
Publication Information
Journal of the Society of Naval Architects of Korea / v.39, no.3, 2002 , pp. 28-40 More about this Journal
Abstract
Turbulent flows around two-dimensional wing sections in ground effect are analysed by incompressible RANS equations and a finite difference method. The Baldwin-Lomax algebraic turbulence model is used to simulate high Reynolds number flows. The main purpose of this study is to clarify the two-dimensional ground effect and its flow characteristics due to different ground boundary conditions, i.e., moving and fixed bottom boundary. As a first step, to validate the present numerical code, the computational result of Clark-Y(t/C 11.7%) is compared with published numerical results and experimental data. Then, NACA4412 section in ground effect is calculated for various ground clearances with two bottom boundary conditions. According to the computational results, the difference in the lift and moment simulated with the two bottom boundary conditions is negligible, but the drag force simulated by the fixed bottom is to some extent smaller than that by the moving bottom. Therefore, it can be concluded that the drag force measured in a wind tunnel with the fixed bottom could be smaller than that with the moving bottom.
Keywords
RANS Equation; Ground Effect; Fixed and Moving; Ground; Clark-Y; NACA4412w;
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