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액적이 있는 비점성 공기유동 모델을 이용한 구름속의 천음속 에어포일 수치해석
염금수(G.S. Yeom),장근식(K.S. Chang),백승욱(S.W. Baek) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
In this paper, the problem of transonic aerodynamic characteristics of a NACA0012 airfoil is numerically investigated in the inviscid gas-droplet two-phase flow with the compressible two-fluid model. In the present study, the airfoil flight in the cloud is simulated by taking account of the viscous drag of the droplets, the heat transfer, the phase change, and the droplet fragmentation. The two-fluid equation system is solved by the fractional-step method and the WAF-HLL scheme. The effects of size and volume fraction of the droplets on the flow characteristics of the airfoil in the cloud are elaborated and discussed.
PSO 기법을 이용한 그루브윅 히트 파이프 형상 최적화 연구
김권호(K.H. Kim),이균호(K.H. Lee),백승욱(S.W. Baek) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
A heat pipe(HP) optimization is unsuitable to Gradient-based methods because design variables have nonlinear interaction and multiple constraints are involved. The object of present study is to optimize the grooved wick HP for a space application using PSO method, simple heuristic search method. The HP configuration is optimized regarding to five parameters and fifteen constraints. To verify the Optimization performance, a total mass estimation are compared with total mass of practical HP.