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About RISS
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http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
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RISS 인기검색어
- 검색키워드
- 저자 : 최성욱(S.W. Choi) (검색결과 41 건)
- 무료
- 기관 내 무료
- 유료
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2-방정식 난류모델을 이용한 스포일러 천이적 공력특성의 파라메트릭 연구
최성욱(S. W. Choi),장근식(K. S. Chang),옥호남(H. N. Ok) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.10
The transient response of an airfoil to a rapidly deploying spoiler is numerically investigated using the turbulent compressible Navier-Stokes equations in two dimensions. Algebraic Baldwin-Lomax model, Wilcox k- ω model, and SST k- ω turbulence model are used to calculate the unsteady separated flow due to the rapid spoiler deployment. The spoiler motion relative to a stationary airfoil is treated by an overset grid bounded by a Dynamic Domain-Dividing Line which has been devised by the authors. The adverse effects of the spoiler influenced by the spoiler location and the hinge gap are expounded. The numerical results are in reasonably good agreement with the existing experimental data.
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보존적 중첩격자기법을 이용한 동적 플랩의 천이적 공력거동에 관한 수치적 연구
최성욱(S. W. Choi),장근식(K. S. Chang) 한국전산유체공학회 1999 한국전산유체공학회 학술대회논문집 Vol.1999 No.-
Transient aerodynamic response of an airfoil to a moving plane. flap is numerically investigated using two-dimensional Euler equations with conservative Chimera grid method. A body moving relative to a stationary grid is treated by an overset grid bounded by a' dynamic domain, dividing line' the concept of which is developed in this study. A conservative Chimera grid method with a dynamic domain-dividing line technique is applied and validated by solving the flowfield around circular cylinder moving supersonic speed. The unsteady and transient characteristics of the flow solver is also examined by computations of a oscillating airfoil and a ramp pitching airfoil respectively. The transient aerodynamic behavior of an airfoil with a moving plane-flap is analyzed for various flow conditions such as deflecting rate of flap and free stream Mach number.
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CHIMERA 격자기법을 이용한 고속전철 주위의 전산유동해석
최성욱(S. W. Choi),김인선(I. S. Kim) 한국전산유체공학회 1996 한국전산유체공학회지 Vol.1 No.1
The aerodynamic characteristics of high speed train can be improved by well-designing of its fore-body shape. In this paper, as a way of the design a fore-body shape which has optimal aerodynamic characteristics, 9 models of fore-body shapes are proposed and the change of aerodynamic characteristics is studied through calculations of flow field around high speed train for each fore-body shape. The flow field around high speed trains are calculated using Thin-Layer Navier-Stokes equation and Chimera grid technique. The application of Chimera grid technique to these flow calculations over high speed train which has ground plane under the train makes grid generation easily. As a computational algorithm, Pulliam and Chaussee's Diagonal algorithm, the modified form of the Beam and Warming's AF scheme which operates on block-tridiagonal matrices, is selected to reduce computational time. Introducing hole points flag concept to this Diagonal algorithm, a algorithm for Chimera grid is generated. The variational trends of aerodynamic characteristics are studied from the results of flow calculations around high speed trains for 9 fore-body shapes.
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대동물 실험을 통한 공압식 박동형 심실보조장치의 박출량 추정 시스템에 대한 유효성 검증
강성민(S.M.kang),김동선(D.S.Kim),김의찬(E.C.Kin),최성욱(S.W.Choi) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
It is necessary to implant a separate device through the skin to measure the flow rate that can indicate the operation status of a ventricular assist device. This has some limitations: high risk of infection and the need to install equipment that can communicate with the implanted device. So this study aims to make in-vivo assessment of blood flow rate estimation using pre-development cardiac output estimation system. The blood flow rate measured in-vivo by an ultrasonic blood flow meter and that based on the inner pressure variation were proved to be similar to each other. Therefore, it is expected that the blood flow rate estimation technique in this study will be able to estimate the flow rate without separate measurement equipment after the implantation of a ventricular assist device.
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