와법을 이용한 분리된 분할판을 가진 정방형주의 유동장 특성계산
Characteristic calculations of flowfield around a square prism having a detached splitter plate using vortex method
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초록
본 연구는 정방형주의 후류측 중심에 분리된 분할판(Detached splitter plate)을 설치한 경우 정방형주의 주위의 유동장을 최신와법으로 파악한 것이다. 레이놀즈 수 Re=1.0×104 및 분할판의 폭을 정방형주한변의 길이(B)로 고정시키고, 특히 항력감소율이 최대인 간격비에 촛점을 맞추어 분할판 유, 무에 따른정방형주에 주위의 순간 및 평균 속도장 및 압력장을 시뮬레이션하였고, 양, 항력계수의 시간변화도 계산하였다. 계산결과는 측정된 항력계수 및 압력분포와 잘 일치하였다. 분할판 설치에 의해 분할판의 상하부에 서로 반대방향의 볼텍스가 발생했고, 이 볼텍스가 정방형주 뒷면의 압력을 상승시켜 항력을 감소시켰음을 명확하게 나타냈다.
Abstract
The characteristics of the unsteady flowfield of a square prism having a detached splitter plate at the wake side were investigated by advanced vortex method. The instantaneous and average velocity field and pressure field around a square prism without and having splitter plate were calculated by forcing the gap ratio having the maximum drag reduction rate, at Reynolds number Re=1.0×104 and the width ratio H/B=1.0 of splitter to the prism width. The drag and lift coefficients on the square prism were also obtained. The calculated results agree with the measured drag coefficients and pressure distributions on the square prism. The vortices of the opposite direction at upside and down side of the splitter plate were generated by installing of the plate. And the drag on the square prism was decreased by increasing of the pressure of back face of the prism with the vortices.
참고문헌 (11)
- M. Gad-el-Hak, "Modern developments in flow control", Appl. Mech, 49(7), pp.365~ (1996)
- T. Igarashi, "Drag reduction of a square prism by flow control using a small rod", Journal of Wind Engineering and Industrial Aerodynamics, 69, pp.141~153 (1997)
- H. Sakamoto, "Suppression of fluid forces acting on a square prism by passive control", Journal of Fluids Engineering, 119, pp.506~511 (1997)
- T. Tamura, "The effect of Turbulence on aerodynamic forces on a square cylinder with various corner shapes", Journal of Wind Engineering and Industrial Aerodynamics, 83, pp.135~145 (1999)
- W. C. Park, "Effect of the length of a splitter plate on drag reduction", Transactions of the Korean Society of Mechanical Engineers B, 17(11), pp.2809~2815 (1993)
- Con J. Doolan, "Flat-plate interaction with the near wake of a square cylinder", The American Institute of Aeronautics and Astronautics Journal, 47(2), pp.475~478 (2009)
- 노기덕, "분리된 분할판에 의한 정방형주의 항력감소", 한국마린엔지니어링학회지, 36(6), pp.808~813 (2012), 한국마린엔지니어링학회[DOI]
- K. Kamemoto, "On attractive features of advanced vortex methods and their subjects as a tool of lagrangian large eddy simulation", Proceedings of the fourth International Conference on Hydrodynamics, pp.37~56 (2000)
- K. D. Ro, "Numerical analysis of unsteady viscous flow through a weis-fogh type ship propulsion mechanism using the advanced vortex method", Journal of Fluids Engineering, 128, pp.481~487 (2006)
- An integral equation formulation of the equation of motion of an incompressible fluid, "J. S. Uhlman", Naval Undersea Warfare Center, ~, pp.Technical Report 10-086 (1992)
- B. E. Lee, "The effect of turbulence on the surface pressure field of a square prism", Journal of Fluid Mechanics, 69, pp.263~282 (1975)