In this study, a high speed planing boat with 7.2 meters in length is developed as the beam larger about 10% by comparing with the general planing boat. The design speed of a boat is 30 knots (about 15.4 m/s) by using 150 hp outboard engine and the main material is FRP. The resistance performance related to the free running attitude as trim and sinkage is discussed and the wave patterns are observed to clear the relationship between the performance and wave characteristics by model test. The turning circle is estimated by Lewandowski´s equation. The results show that not only the wave pattern but also the free running attitude of the boat have the strong influence on a resistance performance. The boat needs smaller engine power and has more stable running attitude because of large sinkage and small variation of trim due to the large area for the lift force and light weight.

In this study, a high speed Rigid Inflatable Boat(RIB) with about 10 meters length is developed. Design speed of the boat is 30 knots (15.43 m/s) using 250 hp twin engines and main material is aluminum. Resistance performance related to the free running attitude as trim and sinkage are discussed and wave patterns are observed to make clear the relationship between the performance and wave characteristics using model test and CFD analysis. The results show that not only wave patterns but also free running attitude of the boat have a strong influence on resistance performance. CFD results including free surface give good relative tendency for effective power and the attitude comparing model test results. CFD analysis used in this study can be used at initial ship design stage of high speed boat.

In this study, a 30ft class high speed catamaran cruise boat is designed and resistance performances are investigated by model test at a circulating water tank. Design speed of the boat is 17knots(8.7m/s) and maximum speed is 20knots(10.3m/s) using 330ps twin engine. Each single bodies are designed unsymmetric planing hull considering high speed-length-ratio(Froude number) and wave interaction at inner part of the hull. Small size fins like chine are attached near free surface at each outside of the hull to separate wave along the hull side. The results show that the small chine plays a big role in separating the wave flowing along the hull. However, in the case of relatively heavy boat such as the developed hull, such a small power due to chine can not cause additional lift and cause resistance increase.

This study investigates the analysis algorithm for developing an optimum hull form with minimum wave resistance by using the practical application of one minus prismatic. In this algorithm the potential-based panel method was adopted to get the wave resistance coefficient as the objective function and SQP method was applied as an optimizer to get the optimum hull form. As an target ship, the series 60(CB=0.6) was taken into account and LBP(length between perpendiculars) of the ship was changed in the direction including a central parallel portion. To verity the validity of this study, the results of the numerical analyses were compared with experimental data.

In this study, electric propulsion leisure boat with 9 meters length is designed and the performances are investigated by CFD analysis and model test. Maximum speed of the developed boat is 15knots(7.7 m/s) using 80Kw electric motor. Catamanan type hull form with slender body is adopted considering high Froude number and large deck area. Two kinds of hull forms are designed and the performances are compared in resistance point of view. Wave patterns are observed to make clear the relationship between resistance performance and wave characteristics. The results show that not only wave interaction due to shoulder waves but also stern waves have a strong influence on resistance performance and CFD analysis including free surface can give useful informations at initial ship design stage for high Froude number catamaran boat.

본 연구에서는 연안의 해저면에 누적된 퇴적오염물을 효율적으로 수거할 수 있는 저속 쌍동형 정화선에 대한 선수선형의 개념설계에 대해 수행하였다. 선형설계는 선체건조가 용이하도록 단순화하였으며, 쌍동선 선형의 선수 Water line, 선수각 등의 변화에 따른 저항성능의 영향을 검토하였다. Ansys CFX를 이용한 수치시뮬레이션과 회류수조에서의 모형시험결과와의 비교/분석 등을 통하여 선수부 선형변화에 따른 저항성능과 자유표면 유동특성 사이의 관계를 고찰하였으며, 그 결과 선수재 위치와 어깨부 체적의 선수부 이동에 따른 파형개선으로 조파저항이 감소하는 등 저항성능의 향상을 확인하였다.

In the present study, numerical analysis algorithm for the hull form optimization was taken into account using optimization algorithm. In this algorithm the sequential quadratic programming method was applied as an optimizer and the potential-based panel method was adopted to get the wave resistance coefficient as the objective function. The hull form was modified using the B-spline surface modeling technique during the whole optimization process. The developed numerical analysis algorithm was applied to a passenger ship and the optimized ship were compared with the original ship.

In the present study, numerical analysis algorithm for the hull form optimization was taken into account using optimization algorithm. In this algorithm the sequential quadratic programming method was applied as an optimizer and the potential-based panel method was adopted to get the wave resistance coefficient as the objective function. The hull form was modified using the B-spline surface modeling technique during the whole optimization process. The developed numerical analysis algorithm was applied to the 300K VLCC and the optimized ship were compared with the original ship.

Hull forms for catamaran type small fishing boat powered by electric motor are newly developed by experimental approaches. Model tests for two hull forms having different length are made at circulating water channel. Resistance performance and wave patterns are compared to carry out an analysis of the effect of extension of main body. The results show that the extension of main body can give better resistance performance above a certain velocity.

To fulfill the design requirement from the Algeria owner, Hull form development of a trawl fishing boat was performed. Model test at CWC in INHA Technical collage was carried out to investigate the resistance characteristics and CFD analysis using FLUENT was performed to examine flow patterns and pressure distribution around hull etc. The designed hull form satisfies speed-power requirement of 10.5 knots at installed power. This paper describes the design feature of trawl fishing boat and evaluates the model test results and CFD results. The design constraints for Algeria trawl fishing boat were explained and the speed of the ship was compared with sea trial results.

This study is concerned with the development of the basic planing hull form of small fishing boat in 25 knots high speed. A series of model test to determine the optimum performance hull form of actual fishing boat with 10 gross tonnage was carried out for 5 models made available planing hull form in the circulation water channel. Model test was performed with the resistance test to study the hydrodynamic characteristics of model ships and the sinkage and trim measurement to investigate the stability of model ships and also the wave pattern observation to analyze the effectiveness of model ships. As the result, the planing hull form of P-4 with deep V type bow can be derived as the best hull form with good performance especially in ship's resistance efficiency showing less residual resistance and sinkage and trim and the spray effect, etc..

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.

본 연구에서는 최적화기법과 전산유체역학의 기술을 이용하여 저항의 관점에서 최적의 형상을 가지는 선형을 개발하는 알고리즘을 개발하였다. 최적화기법으로는 SQP(sequential quadratic programming)을 사용하였으며, 목적함수인 저항을 구하기 위하여 먼저 조파저항은 비선형 자유수면 경계조건을 고려한 선체주위 포텐셜유동을 계산할 수 있는 수치해석기법인 상 방향 패널이동법을 사용하였고, 선체에 미치는 전 저항을 구하기 위하여 ITTC 1957년 모형선-실선상관곡선을 이용하였다. 선형최적화 과정 중의 선체의 변경이나 계산 격자의 생성은 NURBS(Non-Uniform Rational B-Spline)기법을 사용하여 구현하였다. 이와 같은 방법을 사용하여 개발된 선형최적화 기법의 타당성을 검증하기 위하여 선형이 비교적 잘 알려진 건형인 Wigley선형과 Series 60(CB=0.6)선형에 대하여 설계속도 Fn=0.316에서 선형최적화를 위한 수치해석을 수행하고 그 결과를 초기선형과 서로 비교하였다.

This paper presents the method for developing an optimum hull form with minimum wave resistance using SQP( sequential quadratic programming) as an optimization technique. The wave resistance is evaluated by a Rankine source panel method with non-linear free surface conditions and the ITTC 1957 friction line is used to predict the frictional resistance coefficient. The geometry of the hull surface is represented and modified using NURBS(Non-Uniform Rational B-Spline) surface patches. To verify the validity of the developed program the numerical calculations for Wigley hull and Series 60 Cb=0.6 hull are performed and the results obtained after the numerical calculations are compared with the initial hulls.