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사종엽(Jong-Youb Sah) 한국항공우주학회 2016 韓國航空宇宙學會誌 Vol.44 No.3
대중적인 연에는 방패연과 가오리연 두 종류가 있다. 방패연은 전문가들에게 널리 사랑받고 있는 반면, 초보자들에게는 가오리연이 더 익숙하다. 가오리연의 세 종류의 제품들에 대하여 목줄의 매듭을 조사하였다. 가오리 연에 작용하는 공기역학적 힘들을 Fluent를 사용하여 수치적으로 계산하였다. 각 종류의 매듭에 대한 비행 시뮬레이션을 수행함으로써, 기존보다 최소요구풍속이 더 낮은 새로운 매듭을 제안하였다. 최소요구풍속은 연이 날기 시작하는 한계 풍속이다. There is two popular kites, Bangpae and Gaori. While the Bangpae kite is being widely loved by experts, the Gaori kite is popular for kids and beginners. Three types of Gaori kite product have been survayed on the tow point. The aerodynamic force on Gaori kite is numerically calculated by using Fluent. Through flight simulations at the tow point of each kite type, the new tow point, at which the required minimum velocity is lower than those of existing tow points, has been proposed as a standard. The required minimum velocity is the threshold wind velocity at which the kite begins to fly.
사종엽(Jong-Youb Sah) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
The Gaori kite is one of typical ones with the Bangpae kite in Korea. The Gaori kite is popular to an ordinary people such as children, while the Bangpae kite is preferred by an expert. Because the Bangpae kite is considered as the traditional kite in Korea, all of research is focussed on the Bangpae kite. The present study computes the aerodynamic forces on Gaori kite by using CFD, examines the characteristics of flight, and proposes the standardization in both assembling and manipulating the Gaori kite.
사종엽(Jong-Youb Sah),허준성(Jun-Sung Huh) 한국전산유체공학회 2003 한국전산유체공학회지 Vol.8 No.1
The post-processor for two-dimensional flow visualization has been developed by using OOP(object-oriented programming) of Visual C++. User-friendly GUI(graphic user interface) has been built on the base of MFC(Microsoft Foundation Class). The number and order of variables can be specified by user because the input style is the free-format. The new variable can be defined and added to the variable list by using the various operators and functions.
가로세로비 1:1.5를 가진 한국 전통 지연의 방구멍에 대한 연구
사종엽(Jong-Youb Sah) 한국항공우주학회 2020 韓國航空宇宙學會誌 Vol.48 No.4
한국 전통 지연은 장방형으로 그 가운데 방구멍을 가진 특이한 형태를 갖고 있다. FLUENT 코드를 사용하여, 가로세로비 1:1.5인 한국 전통 지연에 작용하는 공기역학적 힘들을 수치적으로 계산하였다. 다양한 직경의 방구멍에 대하여 연의 비행을 시뮬레이션하여, 방구멍의 역할과 방구멍 크기에 따른 영향을 조사하였다. 방구멍은 연싸움에서 연실의 빠른 되감기로 인한 장력의 급격한 상승을 완화시켜 주는 역할을 함으로써, 연실을 더 빨리 되감을 수 있게 한다. 방구멍의 적절한 직경은 가로 폭의 1/3이다. Korean traditional kite has the unusual shape of the elongated rectangle with the center hole. The aerodynamic forces are numerically computed on Korean traditional kite with aspect ratio 1:1.5 by using FLUENT software. Simulating the flight of the kite with various diameters of the center hole, the present study has investigated the role of the center hole as well as the effect of diameter of the center hole. The center hole plays a role in relieving the sudden increase of tension associated with fast rewinding of the kite thread in kite fighting, thereby enabling faster rewinding of the kite thread. The proper diameter of the center hole is 1/3 of the width.
기하학적 Octree 격자생성법을 이용한 자동차 헤드램프 내부의 열유동 계산
사종엽(Jong-Youb Sah),박종렬(Jong-Ryul Park),강동민(Dong-Min Kang) 한국전산유체공학회 2001 한국전산유체공학회 학술대회논문집 Vol.2001 No.-
Three dimensional orthogonal grid generation is able to control effectively the grid spacing near the boundaries, but there are some difficulty to meshing complex geometry. To mesh complex geometry by orthogonal grid generation method must divide block of geometry. It is required a careful skill, and long time. Its also difficulty to make unstructured mesh on complex geometry. Particularly, three dimensional geometry must have more time and effort. Recently, there have been growing interests in mesh generation of complex grometry, aslike an automobile headlamp, the heart. The method of easily meshing complex geometry is resarched to solve them. We suggest octree grid into one among these methods. As octree grid is automaticaly adapted at the boundaries by determine the level, operations to control the grid spacing near the boundaries are unnecessary, In this paper we showed three dimensional mesh generation, and heat-flow analysis on the octree mesh
사종엽(Jong Youb Sah),심은보(Eun Bo Shim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
We investigated the effect of cross-bridge dynamics of cardiac cell on heart mechanics using a newly proposed mathematical model. The alternation of sliding effect in cross bridge filament is mediated through phosphorylation by beta receptor stimulation and closely related to heart failure. A formulation and related variables were introduced to express the sliding effect on cross bridge mechanics. For the delineation of the sliding effect, we developed a cell excitation-contraction model that simulates the sequential cellular events from cell membrane excitation to cross-bridge mechanics. In a whole cell level, the isometric simulations with variable half sarcomere length showed that force generation was maximum at an optimal sarcomere length.
Geometry-based Adaptive Octree 방법에 대한 고찰
박종렬(Jong-Ryoul Park),사종엽(Jong-Youb Sah) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.10
Automatic method for generation of mesh and three dimension natural convection flow result adapted by this method are presented in this paper. It take long time to meshing complex 3-D geometrics, and It's difficult to clustering grid at surface boundary. Octree structure resolve this difficulty.
해석적 자동격자생성방법에서 보간방법에 따른 조절함수의 영향에 관한 연구
채은미(Eun-Ni Chae),사종엽(Jong-Youb Sah) 한국전산유체공학회 1995 한국전산유체공학회 학술대회논문집 Vol.1995 No.-
This study examines effect of various interpolations of interior control function for analytic methods such as Thomas-Middlecoff and Sorenson methods. Laplace interpolation is developed and compared among linear interpolation and exponential interpolation systematically.
배관망의 비정상상태 압축성 유동해석을 위한 TVD와 MOC 방법의 비교 연구
신영섭(Yeung-Seob Shin),사종엽(Jong-Youb Sah) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.10
Pipe network analysis is analyze all of it about pressure and volume flow rate through that are pipeline, junction, regulator and valve etc. In this study is compare TVD with MOC method for analysis of unsteady compressible flow in pipelines. Then, we calculated unsteady compressible flow for pipe network that periodic volume How rate conditions.