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허남건,김욱,김사량,차철현,Hur, Nahm-Keon,Kim, Wook,Kim, Sa-Ryang,Cha, Chul-Hyun 대한설비공학회 2001 설비공학 논문집 Vol.13 No.6
In the present study, the transient axi-symmetric numerical simulation of traffic ventilation induced by a train running through a 15.6km-long tunnel is performed by using over 100,000 computational cells. With train running, three cases of ventilation schemes are simulated, which are the case of ventilation fans turned on, the case of no fan but ventilation shafts open, and the case of no fan and no shaft. Results of the ventilation flow rate are pressure transients are compared for the cases considered.
해인사 장경판전 주변 건축물 이건에 따른 장경판전 환기 기류 변화 해석
허남건,이명성,양성진 대한설비공학회 2007 설비공학 논문집 Vol.19 No.5
In the present study, ventilation flow in the Janggyeongpan-Jeon at Haein temple in case of building rearrangement has been investigated numerically. To achieve more accurate results, detailed shapes such as buildings and the window grills are modeled and tree canopy model is adopted to account for the effect of trees in the computation. Wind velocities as boundary condition are taken from meteorological statistical data. The numerical results show that ventilation flow distributions at Janggyeongpan-Jeon in case of building rearrangement are nearly similar to those before rearrangement.
허남건,조원국,윤성영,윤성영,김광호 대한기계학회 1993 대한기계학회논문집 Vol.17 No.6
A numerical simulation is carried out on flows in a rotating serpentine flow passage, which models a cooling passage in a gas turbine blade, by using a 3-D FVM based TURBO-D program. When it is rotating, the flow field exhibits quite different aspects due to the effect of the Coriolis force. Especially the secondary flow field appearing in the cross-sectional area is very complex because of the combined effect of the Coriolis force and the centrifugal force in the curved area. Local Nusselt numbers are also obtained based on the Reynolds analogy and compared with the published experimental data showing a good agreement. The results of the present study can be applied to the design of cooling passages of a gas turbine blade. 본 연구에서는 모델 냉각통로 내에 대한 유동장 및 열전달 계수분포를 구하기 위하여 수치적 방법에 의한 접근을 시도하였고 이를 위하여 본 연구실에서 개발한 유한체적법 유동해석 프로그램인 TURBO-3D를 사용하였다. 계산 영역은 터빈날개 내의 냉각유로를 단순화한 ㄹ자 형태의 유로를 설정하였으며 등온상태의 유동에 대하여 해를 구하였다.실제 고온의 터빈날개내에서는 큰 온도구배에 의한 강한 부력효과가 예상되어 이를 무시할 수는 없으나 등온 가정하의 유동장으로부터 Reynolds analogy 에 의한 열전달특성의 유추가 가능하다. 그러므로, 본 연구에서는 특히 회전수의 변화에 따른 Coriolis효과의 변화 및 2차 유동의 구조를 파악하였고 또한 이들에 의한 주 유동장과 압력분포 및 국부 열전달 특성을 파악하였다.
허남건,이명성,양성진 대한설비공학회 2011 International Journal Of Air-Conditioning and Refr Vol.19 No.4
Haeinsa temple is famous for over 80 000 wooden printing blocks of Buddhist scriptures called Tripitaka Koreana and its storage halls, both of which have been registered as the world cultural heritages by UNESCO. The objective of the present paper is to investigate the ventilation flow in the storage halls of Tripitaka Koreana in the case of building rearrangement in Haeinsa temple. Three-dimensional flow simulations were performed with the detailed geometry of all buildings in the temple. The slatted windows on walls of the storage halls and Tripitaka Koreana stored in the shelves inside the storage halls were modeled in detail to predict reliable ventilation performance. A tree canopy model was also adopted to take into account of the effect of the forest surrounding the temple. Wind velocities as inlet boundary condition were imposed from meteorological statistical data. The numerical results were obtained for the effects of the wind direction, wind speed and tree canopy model on the ventilation performance of the storage halls. It was shown from the numerical results that the ventilation flow distribution at the storage halls in the case of building rearrangement would not be significantly altered compared to that before rearrangement.