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김종태(J. Kim),박익규(I.K. Park),조형규(H.K. Cho),윤한영(H.Y. Yoon),정재준(J.J. Jeong) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
A three-dimensional (3D) unstructured hydrodynamic solver for transient two-phase flows has been developed. A two-fluid three-field model was adopted for the two-phase flows. The three fields represent a continuous liquid, an entrained liquid, and a vapour field. The hydrodynamic solver is for the 3D component of a nuclear system code and the component-scale analysis tools for transient two-phase flows. The finite volume method and unstuctured grid are adopted, which are useful for the flows in a complicated geometry. The semi-implicit ICE (Implicit Continuous-fluid Eulerian) numerical scheme has been adapted to the unstructured non-staggered grid. This paper presents the numerical method and the preliminary results of the calculations. The results show that the numerical scheme is robust and predicts the phase change and the flow transitions due to boiling and flashing problems well.
비정렬 혼합 격자에서 내재적 방법을 이용한 비압축성 유동해석
김종태(J. Kim),김용모(Y.M. Kim),맹주성(J.S. Maeng) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.3 No.2
The three-dimensional incompressible Navier-Stokes equations have been solved by a node-centered finite volume method with unstructured hybrid grids. The pressure-velocity coupling is handled by the artificial compressibility algorithm and convective fluxes are obtained by Roe's flux difference splitting scheme with linear reconstruction of the solutions. Euler implicit method with Jacobi matrix solver is used for the time-integration. The viscous terms are discretised in a manner to handle any kind of grids such as tetrahedra, prisms, pyramids, hexahedra, or mixed~element grid. Inviscid bump flow is solved to check the accuracy of high order convective flux discretisation. And viscous flows around a circular cylinder and a sphere are studied to show the efficiency and accuracy of the solver.
비구조 혼합 격자에서 내재적 방법을 이용한 비압축성 유동해석
김종태(J. Kim),김용모(Y.M. Kim),맹주성(J.S. Maeng) 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
Three-dimensional incompressible Navier-Stokes equations have been solved by the node-centered finite volume method with unstructured hybrid grids. The pressure-velocity coupling is handled by the artificial compressibility algorithm and convective fluxes are obtained by Roe's flux difference splitting scheme "ith linear reconstruction of the solutions. Euler implicit method is used for time-integration. The viscous terms are discretized in a manner to handle any kind of grids such as tetrahedra, prisms, pyramids, tetrahedra, or mixed-element grid. The numerical efficiency and accuracy of the present method is critically evaluated for several example problems.
2층으로 성층화된 풀 내에서의 자연대류 열전달과 고화현상에 대한 연구
김종태(J. Kim),강경호(K. S. Kang),김상백(S. B. Kim),김희동(H. D. Kim) 한국전산유체공학회 2001 한국전산유체공학회지 Vol.6 No.1
The natural convection heat transfer and solidification in a stratified pool arc studied. The flow and heat transfer characteristics in a heat generating pool are compared between single-layered and double-layered pools. And local Nusselt number distributions on outer walls are obtained to consider thermal loads on a vessel wall. The cooling and solidification of Al₂O₃/Fe melt in a hemispherical vessel are simulated to study the mechanism of heat transfer and temperature distribution. A unstructured mesh is chosen for this study because of the non orthogonality originated from the boundaries of double-layered pool. Interface between the layers is modeled to be fixed. With this assumption mass flux across the interface is neglected, but shear force and heat flux are considered by boundary conditions. The colocated cell -centered finite volume method is used with the Rhie-Chow interpolation to compute cell face velocity- To prevent non- physical solutions near walls in case body force is large the wall pressure is extrapolated by the way to include body force. The numerical solutions calculated by current method show that averaged downward heat flux of the double-layered pool increases compared to single-layered pool and maximum temperature occurs right below the interface of the layers.
HYDRODYNAMIC SOLVER FOR A TRANSIENT, TWO-FLUID, THREE-FIELD MODEL ON UNSTRUCTURED GRIDS
J.J. Jeong(정재준),H.Y. Yoon(윤한영),J. Kim(김종태),I.K. Park(박익규),H.K. Cho(조형규) 한국전산유체공학회 2007 한국전산유체공학회지 Vol.12 No.4
A three-dimensional (3D) unstructured hydrodynamic solver for transient two-phase flows has been developed for a 3D component of a nuclear system code and a component-scale analysis tool. A two-fluid three-field model is used for the two-phase flows. The three fields represent a continuous liquid. an entrained liquid. and a vapour field. An unstructured grid is adopted for realistic simulations of the flows in a complicated geometry. The semi-implicit ICE (Implicit Continuous-fluid Eulerian) numerical scheme has been applied to the unstructured non-staggered grid. This paper presents the numerical method and the preliminary results of the calculations. The results show that the modified numerical scheme is robust and predicts the phase change and the flow transitions due to boiling and flashing very well.