• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2011.06a
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• pp.399-401
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• 2011

반잠수식 시추선의 주선체(lower hull)를 세 가지 타입으로 설계하여 주선체에 대한 유체정역학적 계산, 조종성능 및 내항성능 계산 그리고 이론계산을 수행하여 wave distribution과 height도 각각 비교 분석하였다. 주선체의 Convention type, Bulbous bow type, 그리고 Ice breaking type 중 Ice breaking type 선형의 성능이 가장 우수하였다. 다음으로는 반잠수식 시추선의 모든 조건(작업, 이동, 생존)에서 주기둥(column) 또는 주선체(Lower)가 손상되어 부력을 상실했을 시 전복 되지 않도록 고안된 예비부력 기능과 기름 유출 사고시 기름을 회수 할 수 있는 기능을 갖춘 유회수 겸용 예비부력 탱크를 개발하였다.

• Journal of Energy Engineering
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• v.23 no.4
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• pp.95-105
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• 2014

The CUPID code has been developed for a transient, three-dimensional, two-phase flow analysis at a component scale. It has been validated against a wide range of two-phase flow experiments. Especially, to assess its applicability to single- and two-phase flow analyses in the Calandria vessel of a CANDU nuclear reactor, it was validated using the experimental data of the 1/4-scaled facility of a Calandria vessel at the STERN laboratory. In this study, a preliminary thermal-hydraulic analysis of the CANDU reactor moderator tank using the CUPID code is carried out, which is based on the results of the previous studies. The complicated internal structure of the Calandria vessel and the inlet nozzle was modeled in a simplified manner by using a porous media approach. One of the most important factors in the analysis was found to be the modeling of the tank inlet nozzle. A calculation with a simple inlet nozzle modeling resulted in thermal stratification by buoyance, leading to a boiling from the top of the Calandria tank. This is not realistic at all and may occur due to the lack of inlet flow momentum. To improve this, a new nozzle modeling was used, which can preserve both mass flow and momentum flow at the inlet nozzle. This resulted in a realistic temperature distribution in the tank. In conclusion, it was shown that the CUPID code is applicable to thermal-hydraulic analysis of the CANDU reactor moderator tank using the cost-effective porous media approach and that the inlet nozzle modeling is very important for the flow analysis in the tank.