• 대한조선학회논문집
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• 제42권1호
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• pp.34-42
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• 2005

An overview of 30 feet sailing yacht design is presented, with an emphasis on the factors contributing to start-up popularization. After prescribing the configurations of the purposed yacht, the design of the hull form with a rudder and a keel, are schematically described. Also the determinations of the dimensions of the sail and rig are performed. Finally this paper is associated with the state-of-the-art of calculating sailing yacht performance as this is performed in velocity prediction program (VPP). The VPP results shows a typical shape of a sailing yacht and the designed yacht has the best performance at 120 degree angle of true wind with 20 knots.

• 대한조선학회논문집
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• 제42권1호
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• pp.50-56
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• 2005

The performance of Traditional Korean Fishing Boat is surveyed based on Report on Investigation of Korean Fishing Boat. The characteristics of Traditional Korean fishing Boat of hull form, rudder, sail are studied from the view point of modern sailing boat design. As a result we find her hull form is an excellent candidate of mother ship for modern boat design and the great sized rudder of Traditional Korean Fishing Boat makes a role of the centerboard of modern sailing host. And also we find the sail of Traditional Korean fishing Boat is more useful for sailing against the wind direction than an ordinary Lug sail.

• International Journal of Naval Architecture and Ocean Engineering
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• 제8권5호
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• pp.466-474
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• 2016

The model tests results for the original lines of an 10000TEU container vessel show that the delivered power is higher and could not satisfy the requirement of energy saving effects and design targets. In this paper, the lines optimization of the 10,000 twin-skeg container vessel was carried out by parametric modeling and CFD simulations. At first, the CFD methods for twin-skeg hull form were validated by the comparison with the experimental results. Then more than one hundred parameters were adopted for the establishment of the fully parametric model. Based on the parametric model of the twin-skeg container vessel, the preliminary optimization was carried out by tight coupling of FRIENDSHIP-FRAMEWORK with potential flow of SHIPFLOW. Then several important parameters related to the after part of twin-skeg vessel were investigated by viscous flow computation. The final optimized variant PM11, which the total resistance was reduced by about 8.3% in model scale, is obtained within the constraints of general arrangement. And the model tests for variant PM11 was carried out in CSSRC, which shows that the resistance of optimized variant PM11 is decreased by about 8.6%.

• 해양환경안전학회지
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• 제6권2호
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• pp.33-46
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• 2000

As far as fishing vessels are concerned, there are two aspects to be noted: One is the stability which is the greatest concern for the safety of fishing vessels, as the corresponding number of casualty is overwhelming compared with those of other types of vessels. To flake it worse, the feature of casualty is rather catastrophic, accompanying major fatalities. The other aspect is related to the needs of improvement of resistance performance along with the hull form development. In particular, small fishing vessels, such as under 24m in length, which is dominant size in the type, need further scrutiny to enhance the qualities mentioned above, as relevant standards/criteria on the issues are not shown clearly and, therefore, implemented for the design or assessment.

• 대한조선학회논문집
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• 제41권1호
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• pp.64-69
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• 2004

In recent years, Medium size high speed Ro-Pax vessel has appeared at European sea and especially Agean sea is a center of operating in this type of Ro-Pax. This vessel operates its high Froude number range and requires higher engine power due to considerably increased resistance in comparing to large Ro-Pax in high speed range. SHI has investigated this kind of high speed Ro-Pax in accordance with market requirements and developed more advanced vessel to meet the future market needs. Process of hull form development, model test results and design of general arrangement results are introduced in this paper.

• 대한조선학회논문집
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• 제41권1호
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• pp.15-22
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• 2004

Twin-skeg type stern shapes are recently adopted for very large commercial ships. However it is difficult to apply a CFD system to a hull form having twin-skeg, since grid topology around a twin-skeg type stern is more complicated than that of a conventional single-screw ship, or of an open-shaft type twin-screw ship with center-skeg. In the present study a surface mesh generator and a multi-block field grid generation program have been developed for twin-skeg type stern. Furthermore, multi-block flow solvers are utilized for potential and viscous flow analysis around a twin-skeg type stern The present computational system is applied to a 15,000TEU container ship with twin-skeg to prove the applicability. Wave profiles and wake distribution are calculated using the developed flow analysis tools and the results are compared with towing tank measurements.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2017년도 추계학술발표회
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• pp.257-257
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• 2017

• 한국해양공학회지
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• 제20권3호
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• pp.88-95
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• 2006

The resistance characteristics of a trimaran are studied, varying the bottom profile and transom stern of the main hull. The bottom profile is varied in three cases (convex, flat, concave). Using the experimental and numerical methods, the resistance performance of each hull form is compared. The experiments are carried out in ship model basin, and the numerical simulations are performed by a finite-difference method, based on the Marker and Cell scheme. Euler and continuity equationsare used for the governing equations of the flaw field around a trimaran with transom stern. The agreement of both results is good. The optimal bottom profiles for transom stern are presented for law-speed and high-speed regions, respectively.

• 대한조선학회논문집
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• 제31권2호
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• pp.7-14
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• 1994

본 연구에서는 사용자가 편리하게 사용할 수 있는 대화식 선형변환 기법을 이용한 선형설계 프로그램을 개발하였다. 선형변환 기능은 기존의 선형 Variation 기능을 가진 선박 계산 Package의 CB, LCB변환 이외에 Deadrise 생성 및 제거, 중앙 횡단면 형상 변환, 선수미부 형상변환, 단면형상 특성 변환 등 다양한 기능을 가지고 있다. 프로그램 수행시 사용자의 편의와 대화식 입출력작업을 위해 X-Window를 근간으로 하는 OSF/Motif를 이용한 그래픽 사용자 인터페이스(Graphical User Interface: GUI)를 구현하였고, 2,3차원 그래픽 라이브러리인 X-PLOT과 GLBAX를 이용하여 변환결과를 가시화하였다. 또한 선박 기본계산 프로그램과 내항 및 조종 프로그램과의 접속을 위한 interface 모듈도 개발하였다.

• 대한조선학회논문집
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• 제36권1호
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• pp.61-69
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• 1999

수치 계산을 이용하여 선형의 유체동력학적인 특성을 신속히 파악하기 위해서는 선체표면 격자계를 생성하는 과정이 쉽고 자동화되어 있어야 한다. 이를 위하여 기본 스테이션 오프셋과 선수미 윤곽선만을 이용하여 선형을 정의하고, 이를 이용하여 퍼텐셜 유동이나 점성유동의 계산에 필요한 선체 표면 격자계를 손쉽게 생성할 수 있는 방법을 개발하였다. 선수와 선미 벌브를 가진 일반 상선의 선형을 표현하기 위해 수선의 양 끝단을 타일, 포물선, 쌍곡선, 3차 곡선 등의 조합으로 표시할 수 있게 하였다. 그리고 선수와 선미의 윤곽선을 격자계의 경계선으로 하였기 때문에 비선형 자유수면 조건을 이용한 조파저항 계산에서의 격자 변형이나 점성유동 해석을 위한 난류 경계층에서의 벽좌표의 정의가 종단면을 기준으로 한 종래의 격자에 비해 매우 편리하다고 할 수 있다.