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허남건(Nahmkeon Hur),김성원(Seongwon Kim) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.1
Spiral tube heat exchangers can find numerous applications in many engineering fields. Flow in spiral tubes is interest to engineers due to occurrence of secondary flow which enhances the cross-sectional mixing and the heat transfer rate. In the present study, an incompressible viscous 3-D flow in spiral tubes with rectangular cross-section of various torsion rate and Reynolds number is studied by using a finite volume method. It is shown that the axial velocity profile is affected by the secondary flow motion. Because there is some difference from correlation proposed by Hur et al, a lot of analysis and arrangement of experimental results are needed. This study showed the results of variation of hydrodynamic entry length for torsion and Re numbers.
허남건(Nahmkeon Hur),원찬식(Chan-Shik Won),유홍선(Hong-Sun Ryou),손기헌(Gihun Son),김사량(Sa Ryang Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
A general purpose CFD program NUFLEX has been developed, which is capable of analyzing laminar/turbulent flows in complex geometries with various physics models. The flow physics implemented in the program include internal tracking, cavitation, melting/solidification, spray, etc. In the present paper, a brief introduction of the program will go given and some application of the program will be demonstrated.
허남건(Nahmkeon Hur),김욱(Wook Kim) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.1
Drag reduction on vehicles are the main concern for the body shape designers in order to lower the fuel consumption rate and to aid the driving stability. The drag of bluff bodies like transportation vehicles is mostly pressure drag due to the flow separation, which can be minimized by controlling the location and size of the separation bubble. In the present study, the TURBO-3D code is incorporated with optimal algorithm based on analytical approximation method to obtain an optimal after body shape of the MIRA Model corresponding to the lowest drag coefficient. For this purpose three mutually independent afterbody angles are chosen as design variables, while the drag coefficient is chosen as an objective function. It is demonstrated in the present study that an optimal body shape having the lowest drag coefficient which is about 6% lower than that of the original shape has been successfully obtained within number of iterations of the optima] design loop.
허남건(Nahmkeon Hur),김욱(Wook Kim) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.1
Drag reduction on vehicles are the main concern for the body shape designers in order to lower the fuel consumption rate and to aid the driving stability. The drag of bluff bodies like transportation vehicles is mostly pressure drag due to the flow separation, which can be minimized by controlling the location and size of the separation bubble. In the present study, the TURBO-3D code is incorporated with optimal algorithm based on analytical approximation method to obtain an optimal after body shape of the MIRA Model corresponding to the lowest drag coefficient. For this purpose three mutually independent afterbody angles are chosen as design variables, while the drag coefficient is chosen as an objective function. It is demonstrated in the present study that an optimal body shape having the lowest drag coefficient which is about 6% lower than that of the original shape has been successfully obtained within number of iterations of the optima] design loop.
허남건(Nahmkeon Hur),김성원(Seongwon Kim) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.1
Spiral tube heat exchangers can find numerous applications in many engineering fields. Flow in spiral tubes is interest to engineers due to occurrence of secondary flow which enhances the cross-sectional mixing and the heat transfer rate. In the present study, an incompressible viscous 3-D flow in spiral tubes with rectangular cross-section of various torsion rate and Reynolds number is studied by using a finite volume method. It is shown that the axial velocity profile is affected by the secondary flow motion. Because there is some difference from correlation proposed by Hur et al, a lot of analysis and arrangement of experimental results are needed. This study showed the results of variation of hydrodynamic entry length for torsion and Re numbers.
허남건(Nahmkeon Hur),원찬식(Chan-Shik Won),유홍선(Hong-Sun Ryou),손기헌(Gihun Son),김사량(Sa Ryang Kim) 한국전산유체공학회 2007 한국전산유체공학회지 Vol.12 No.2
A general purpose program NUFLEX for the analysis 3-D thermo/fluid flow and pre/post processor in complex geometry has been developed, which consists of a flow solver based on FVM and GUI based pre/post processor. The solver employs a general non-orthogonal grid system with structured grid and solves laminar and turbulent flows with standard/RNG k-ε turbulence model. In addition, NUFLEX is incorporated with various physical models, such as interfacial tracking, cavitation, MHD, melting/solidification and spray models. For the purpose of evaluation of the program and testing the applicability, many actual problems are solved and compared with the available data. Comparison of the results with that by STAR-CD or FLUENT program has been also made for the same flow configuration and grid structure to test the validity of NUFLEX.
허남건(Nahmkeon Hur),원찬식(Chan-Shik Won),유홍선(Hong-Sun Ryou),손기헌(Gihun Son),김사량(Sa Ryang Kim) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
A general purpose program NUFLEX for the analysis 3-D thermo/fluid flow and pre/post processor in complex geometry has been developed, which consists of a flow solver based on FVM and GUI based pre/post processor. The solver employs a general non-orthogonal grid system with structured grid and solves laminar and turbulent flows with standard/RNG k-ε turbulence model. In addition, NUFLEX is incorporated with various physical models, such as interfacial tracking, cavitation, MHD, melting/solidification and spray model. For the purpose of verification of the program and testing the applicability, many actual problems are solved and compared with the available data. Comparison of the results with that by STAR-CD or FLUENT program has been also made for the same flow configuration and grid structure to test the validity of NUFLEX.