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정세민(S.M. Jeong) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.2
The Gradient Biome is a unique and large greenhouse(length 200 m, width 50 m, height:40 m) in which the elements of the weather, such as temperature and humidity, are controlled and reproduced in such a way as to create a continuous gradient from the tropical to frigid zones along specified longitudinal or transvers lines on the earth. One of the main purposes of the Gradient Biome is to observe the possible responses of the ecosystems (mainly plants), which are to be corresponding to each test climate and be introduced in the Biome, to the expected global warming. As one of the expected responses is the shift of the ecosystem(s) toward the region of suitable environment, there should be no artificial obstacles, which can prevent the shift, inside the facility. However, it is important but not so easy to find the ways of how the temperature and humidity in the Biome could be reproduced since the environmental variables tends to be homogeneous. In this paper, numerical simulations were carried out to find the effective control methods for air temperature and humidity inside the real scale Biome. One of the contributed solvers of OpenFOAM, which is an open source physics simulation code, was modified and used for the simulations.
OpenFOAM을 이용한 대규모 환경재현 시스템 내에서의 환경변수 제어 시뮬레이션
정세민(S.-M. Jeong),Kagemoto Hiroshi,박종천(J.-C. Park) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
The feasibility of a unique greenhouse, named as Gradient Biome, is now being examined extensively in the University of Tokyo. It is a large chamber (length 200m, width 50m, height:40m) in which the weather, such as temperature and humidity, of the tropical zone through to that of the frigid zone on the earth is reproduced with continuous gradient . In the Gradient Biome, ecosystems (mainly plants) corresponding to each weather are introduced and the possible responses of this ecosystems to the expected global warming are to be observed. Since one of the expected responses is the shift of the ecosystem(s) toward the region of suitable environment, there should be no artificial obstacles, which can prevent the shift, inside the Biome. This requirement is not so easy to be satisfied since the environment tends to be homogeneous. This paper presents the results of the numerical studies conducted to find the ways of how the temperature and humidity in the Gradient Biome could be reproduced. One of the contributed solvers of OpenFOAM, which is an open source physics simulation code, was modified and used for the numerical simulations.
OpenFOAM을 이용한 대규모 환경재현 시스템 내에서의 환경변수 제어 시뮬레이션
정세민(S.-M. Jeong),Kagemoto Hiroshi,박종천(J.-C. Park) 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.1
The feasibility of a unique greenhouse, named as Gradient Biome, is now being examined extensively in the University of Tokyo. It is a large chamber (length 200m, width 50m, height:40m) in which the weather, such as temperature and humidity, of the tropical zone through to that of the frigid zone on the earth is reproduced with continuous gradient. In the Gradient Biome, ecosystems (mainly plants) corresponding to each weather are introduced and the possible responses of this ecosystems to the expected global warming are to be observed. Since one of the expected responses is the shift of the ecosystem(s) toward the region of suitable environment, there should be no artificial obstacles, which can prevent the shift, inside the Biome. This requirement is not so easy to be satisfied since the environment tends to be homogeneous. This paper presents the results of the numerical studies conducted to find the ways of how the temperature and humidity in the Gradient Biome could be reproduced. One of the contributed solvers of OpenFOAM, which is an open source physics simulation code, was modified and used for the numerical simulations.
2차원 비압축성 점성유동에 관한 무격자법 기반의 수치해석
정세민(S.-M. Jeong),박종천(J.-C. Park),허재경(J.-K. Heo) 한국전산유체공학회 2009 한국전산유체공학회지 Vol.14 No.4
The gridless (or meshfree) methods, such as MPS, SPH, FPM an so forth, are feasible and robust for the problems with moving boundary and/or complicated boundary shapes, because these methods do not need to generate a grid system. In this study, a gridless solver, which is based on the combination of moving least square interpolations on a cloud of points with point collocation for evaluating the derivatives of governing equations, is presented for two-dimensional unsteady incompressible Navier-Stokes problem in the low Reynolds number. A MAC-type algorithm was adopted and the Poission equation for the pressure was solved successively in the moving least square sense. Some typical problems were solved by the presented solver for the validation and the results obtained were compared with analytic solutions and the numerical results by conventional CFD methods, such as a FVM.
2차원 비압축성 점성유동에 관한 무격자법 기반의 수치해석
정세민(S-.M. Jeong),박종천(J.C. Park),허재경(J.K. Heo) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.4
The gridless (or meshfree) methods, such as MPS, SPH, FPM an so forth, are feasible and robust for the problems with moving boundary and/or complicated boundary shapes, because these methods do not need to generate a grid system. In this study, a gridless solver, which is based on the combination of moving least square interpolations on a cloud of points with point collocation for evaluating the derivatives of governing equations, is presented for two-dimensional unsteady incompressible Navier-Stokes problem in the low Reynolds number. A MAC-type algorithm was adopted and the Poission equation for the pressure was solved by successively in the moving least square sense. Some weighing functions were tested in order 10 investigate the up-winding effect for the convection term. Some typical problems were solved by the presented solver for the validation and the results obtained were compared with analytic solutions and the numerical results by conventional CFD methods, such as FVM.
붕괴파의 사각기둥에 미치는 유체충격력 예측을 위한 3차원 다상류 시뮬레이션
정세민(S.-M. Jeong),황성철(S.-C. Hwang),박종천(J.-C. Park) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
In this study, impact loads on the tank walls by sloshing phenomena and on a tall structure in a three-dimensional rectangular tanks were predicted by multiphase flow simulations. The solver is based on CIP/CCUP(Constraint Interpolation CIP/CIP Combined Unified Procedure) method and THINC-WLIC(Tangent Hyperbola for Interface Capturing-Weighted Line Interface calculation) method was used to capture the air-water interface. For the convection terms of Navier-Stokes equations, the USCIP (Unsplit Semi-Lagrangian CIP) method was adopted. The results of simulations were compared with those of experiments. Overall comparisons were reasonably good.
무격자법을 이용한 2차원 다중 물체주위의 점성 유동 해석
정세민(S.-M. Jeong),남정우(J.-W. Nam),박종천(J.-C. Park) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
The gridless (or meshfree) methods, such as MPS, SPH, FPM an so forth, are feasible and robust for the problems with moving boundary and/or complicated boundary shapes, because these methods do not need to generate a grid system. In this study, a gridless solver, which is based on the combination of moving least square interpolations on a cloud of points with point collocation for evaluating the derivatives of governing equations, is presented for two-dimensional unsteady incompressible Navier-Stokes problem in the low Reynolds number. A MAC-type algorithm was adopted and the Poission equation for the pressure was solved by successively in the moving least square sense. Flow fields around two-dimensional multi bodies were solved by the presented solver for the validation and the results obtained were compared with experimental and other numerical results by conventional CFD methods, such as FVM.