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기포의 거동을 모사하기 위한 직접 접근법을 사용한 Level set 방법
조명환(M. H. Cho),최상헌(S. H. Choi),유정열(J. Y. Yoo),최형권(H. G. Choi) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.11
A level set method is proposed to simulate the incompressible two-phase flow considering the effect of surface tension. For reinitialization of level set function, a direct approach method is employed, instead of solving hyperbolic type equation. A mixed elements is adopted, so that the continuity and Navier-Stokes equations are solved by using the Q2Q1 integrated finite element method, and the level set function is solved by using the Q1Q1 finite element method. In order to verify the accuracy and robustness of the code, the present method is applied to a few benchmark problems. It is confirmed that the present results are in good qualitative and quantitative agreements with the existing studies.
삼각형 요소와 사각형 요소에 기초한 상승기포의 모사를 위한 Level set 방법
조명환(M.H. Cho),최형권(H.G. Choi),전병진(B.J. Jeon),유정열(J.Y. Yoo) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
A level set method is proposed to simulate the incompressible two-phase flow considering the effect of surface tension. For reinitialization of level set function, a direct approach method is employed, instead of solving hyperbolic type equation. A mixed element is adopted, so that the continuity and Navier-Stokes equations are solved by using the quadratic elements (six-node triangular element and nine-node quadrilateral element), and the level set function is solved by using the linear elements (three-node triangular element and four-node quadrilateral element). In order to verify the accuracy and robustness of the codes, the present methods are applied to a few benchmark problems. It is confirmed that the present results are in good qualitative and quantitative agreements with the existing studies.
2차원 채널유동에서의 액적 변형에 대한 수치해석적 연구
정성록(S.R. Jung),조명환(M.H. Cho),최형권(H.G. Choi),유정열(J.Y. Yoo) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
In this study, the two-phase incompressible flow in two-dimensional channel considering the effect of surface tension is simulated using an improved level-set method. Quadratic element is used for solving the continuity and Navier-Stokes equations to avoid using an additional pressure equation, and Crank-Nicholson scheme and linear element are used for solving the advection equation of the level set function. Direct approach method using geometric information is implemented instead of the hyperbolic-type partial differential equation for the reinitializing the level set function. The benchmark test case considers various arrays of deformable droplets under different flow conditions in straight channel. The deformation and migration of the droplets are computed and the results are compared very well with the existing studies.
김재돌(J. D. Kim),이호생(H. S. Lee),윤정인(J. I. Yoon),홍정희(J. H. Hong),조명환(M. H. Cho) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
The paper deals with the characteristics of vacuum freezing equipment for dry flower. The equipment needs to be operated by the technology related with super low temperature, high vacuum, dry. The vacuum freezing equipment used in this experiment consists of the super low temperature part, high vacuum measurement part and hot gas supplier. The temperature in the chamber, cold trap and hot gas injection was changed as -25~-45℃, -45~-60℃, -10~-20℃, respectively. The time which reach to the steady state increased as the temperature in the chamber and cold trap. The operating characteristics of main part of experimental apparatus was changed according to the condition variation. Also, the condition of flower such as size and color after dry was superior comparing with natural dry.