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IoT 모듈 두께를 고려한 플라잉디스크 형상의 공력 특성 연구
김태욱(T.U. Kim),박수형(S.H. Park),성상경(S. Sung),이주환(J. Lee) 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.3
The aerodynamic characteristics of the flying disk was investigated by considering the loading effect due to the attachment of a IoT module. Aerodynamic coefficients with the angle of attack were computed for a validation model and compared with experimental data and previous CFD results. The variation with module thickness was computed and analyzed. The results showed that as the thickness of the module increases, both lift and drag coefficients are increased. Bump-like module produces higher pressure distribution on the module surface and lower pressure in the inner front surface. As a result the pitching moment coefficient is largely varied with module thickness.
세장비 인 초음속 공동유동에서 차원 효과로 인한 유동 진동 주파수 분석
김태욱(T.U. Kim),박수형(S.H. Park),이승수(S. Lee),유동옥(D.O. Yu),유흥철(H.C. You) 한국전산유체공학회 2018 한국전산유체공학회지 Vol.23 No.3
Unsteady turbulent flow simulations were performed to investigate flow oscillation frequency due to three dimensional effect in supersonic cavity flow of length-to-depth ratio of 3, width-to-depth ratio of 1 and Mach 1.5. Two- and three-dimensional unsteady simulations result were compared with experimental data and prediction from the Rossiter equation. Pressure oscillation in three-dimensional cavity and the corresponding frequency were well matched with the empirical data. The flow structure corresponding to each mode was investigated. The results show that two dimensional flow is in the wake mode and three-dimensional flow is mainly in the shear layer mode. The oscillation frequency spectrum clearly indicate the three-dimensional effect due to the sidewall.