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박재형(J.H. Park),안계현(K.H. Ahn),이승수(S. Lee),유동옥(D.O. Yu),유흥철(H.C. You),최선규(S.K. Choi) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.1
In this paper, a DDES analysis on the aerodynamic forces and moments of a generic missile inside a rectangular cavity is presented. First, the implementation of the DDES method into a CFD code is validated by comparing the computational results with the experimental results for unsteady turbulent flows around a cylinder and a back facing step. Second, the unsteady pressure fluctuations inside WICS cavity are computed and compared to the experimental results, which shows a good agreement. The unsteady flow field inside the cavity with the missile is analyzed, and the computational results of the unsteady pressure fluctuation and the force and moment are presented.
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.