Experimental Data for KCS Added Resistance and ONRT Free Running Course Keeping/Speed Loss in Head and Oblique Waves

2020 ◽  
pp. 61-137
Author(s):  
Yugo Sanada ◽  
Claus Simonsen ◽  
Janne Otzen ◽  
Hamid Sadat-Hosseini ◽  
Yasuyuki Toda ◽  
...  
Keyword(s):  
Experimental Data ◽  
Added Resistance ◽  
Oblique Waves ◽  
Free Running

Added Powering Measurements of KCS Maneuvering in Regular Variable Heading Waves

2017 ◽  
Author(s):  
Yugo Sanada ◽  
Shogo Ito ◽  
Yasuyuki Toda ◽  
Frederick Stern
Keyword(s):  
Scale Effects ◽  
Open Water ◽  
Container Ship ◽  
Added Resistance ◽  
Oblique Waves ◽  
Wave Basin ◽  
Head Waves ◽  
Regular Variable ◽  
Free Running ◽  
Thrust And Torque

To know more detail of added powering and propeller load fluctuations in regular waves during free-maneuvering, free-running tests of KRISO Container Ship model (KCS) are conducted. KCS 2.7 m model that was used in the previous surge-free added resistance experiments is modified and new free-running system with compact dynamometer is installed. Free-running tests in calm water and in regular variable heading waves are performed at IIHR 40 m × 20 m × 3 m wave basin to obtain 6DOF motions with thrust/torque data. Propeller open water tests were performed at Osaka University towing tank (OU). To evaluate facility bias and scale effects, trajectories, motions and maneuvering characteristic parameters are compared with those of different size model taken at other facilities. Free-running course keeping tests in regular variable heading waves are performed as same conditions with Tokyo 2015 A Workshop on CFD in Ship Hydrodynamics (T2015) case 2.10 and case 2.11. Those results are compared with the data taken at FORCE with 6 m free-running model and OU with 3.2 m model by surge-free mount. In head waves, trends of RAO for heave and pitch are the same under surge-free and free-running. Added thrust/torque and propeller open water efficiency reduction of IIHR and OU become maximum at λ/ L=1.15 where the added resistance was maximum under surge-free condition. In oblique waves, added thrust and torque become larger where the wave encounter angle is from 0° to 45° and both trends agree with other type of container ship. Thrust and torque fluctuations of KCS become larger in beam and following waves. Variation of self-propulsion factors due to wave encounter angles are small in oblique waves.

Assessment of CFD for KCS Added Resistance and for ONRT Course Keeping/Speed Loss in Regular Head and Oblique Waves

2020 ◽  
pp. 333-439
Author(s):  
Frederick Stern ◽  
Hamid Sadat-Hosseini ◽  
Timur Dogan ◽  
Matteo Diez ◽  
Dong Hwan Kim ◽  
...  
Keyword(s):  
Added Resistance ◽  
Oblique Waves

Numerical Analysis on Added Resistance of Ship by 3-D Green Function Method

2006 ◽  
Author(s):  
Yoshiyuki Inoue ◽  
N. M. Golam Zakaria
Keyword(s):  
Experimental Data ◽  
Numerical Analysis ◽  
Green Function ◽  
Function Method ◽  
Numerical Results ◽  
Numerical Code ◽  
Added Resistance ◽  
Green Function Method ◽  
Total Potential ◽  
Motion Responses

This paper deals with the numerical analysis on added resistance of a ship by 3-D Green Function Method. Linear potential theory has been used to describe the fluid motion and 3-D sink-source technique with forward speed has been applied to determine hydrodynamic forces for surface ship advancing in waves at constant speed. After solving the motion equation in frequency domain, radiation potential due to motion responses have been calculated to obtain the total potential of the flow field. Then, total potential and its derivatives have been obtained to assess the added resistance in waves by near field approach. To show the validity of the numerical code, the present numerical results for motion responses and wave loads on ships have been compared with experimental data as well as some numerical results by different approaches. Then the added resistances given by present numerical calculation by 3-D Green Function have been compared with some classical 2-D methods as well as experimental data for Series 60 ships. Finally the present numerical calculations have been applied for fuller form slow speed vessel where the classical 2-D methods usually fails to give good results due to their inherent limitations. The numerical results suggest that better agreement have been achieved in many cases using present full 3-D Green Function method.

scholarly journals Added resistance and seakeeping performance of trimarans in oblique waves

2020 ◽  
Vol 216 ◽  
pp. 107721
Author(s):  
Jiaye Gong ◽  
Shiqiang Yan ◽  
Qingwei Ma ◽  
Yunbo Li
Keyword(s):  
Added Resistance ◽  
Oblique Waves ◽  
Seakeeping Performance

scholarly journals Comparative study on analysis methods for added resistance of four ships in head and oblique waves

2021 ◽  
Vol 236 ◽  
pp. 109552
Author(s):  
Jae-Hoon Lee ◽  
Yonghwan Kim ◽  
Beom-Soo Kim ◽  
Frederik Gerhardt
Keyword(s):  
Comparative Study ◽  
Added Resistance ◽  
Oblique Waves ◽  
Analysis Methods

Numerical Study on Added Resistance Computations in Short Waves

2016 ◽  
Author(s):  
Xinshu Zhang ◽  
Kang Tian ◽  
Yunxiang You
Keyword(s):  
Experimental Data ◽  
Numerical Solutions ◽  
Numerical Study ◽  
Three Dimensional ◽  
Added Resistance ◽  
Rankine Panel Method ◽  
Short Waves ◽  
Global Performance ◽  
Different Types ◽  
Wigley Hull

Evaluation of added resistance in short waves is critical to the assessment of the global performance of a ship traveling in a seaway. In this paper, three methods of added resistance evaluation in short waves are briefly reviewed, including those proposed by Fujii & Takahashi [1], Faltinsen et al. [2], and Kuroda et al. [3]. Based on the experimental data collected by Kuroda et al., a new method is developed for the estimation of added resistance in short waves. The proposed method is validated by comparing the obtained numerical results with experimental data and other numerical solutions for different types of hulls, including the Wigley hull I, KVLCC2 hull, Series 60 hull with CB = 0.7, and the S-175 hull. The present study confirms that the developed method can well predict the added resistance in short waves and complement the three-dimensional Rankine panel method developed in a previous study focusing on intermediate and long waves.

scholarly journals Establishment of a Validation and Benchmark Database for the Assessment of Ship Operation in Adverse Conditions

2016 ◽  
Author(s):  
Florian Sprenger ◽  
Vahid Hassani ◽  
Adolfo Maron ◽  
Guillaume Delefortrie ◽  
Thibaut Van Zwijnsvoorde ◽  
...  
Keyword(s):  
Experimental Data ◽  
Shallow Water ◽  
Deep Water ◽  
Public Domain ◽  
Added Resistance ◽  
Test Program ◽  
Adverse Conditions ◽  
Research Institutes ◽  
Drift Force ◽  
Ship Operation

The Energy Efficiency Design Index (EEDI), introduced by the IMO [1] is applicable for various types of new-built ships since January 2013. Despite the release of an interim guideline [2], concerns regarding the sufficiency of propulsion power and steering devices to maintain manoeuvrability of ships in adverse conditions were raised. This was the motivation for the EU research project SHOPERA (Energy Efficient Safe SHip OPERAtion, 2013–2016 [3–6]). The aim of the project is the development of suitable methods, tools and guidelines to effectively address these concerns and to enable safe and green shipping. Within the framework of SHOPERA, a comprehensive test program consisting of more than 1,300 different model tests for three ship hulls of different geometry and hydrodynamic characteristics has been conducted by four of the leading European maritime experimental research institutes: MARINTEK, CEHIPAR, Flanders Hydraulics Research and Technische Universität Berlin. The hull types encompass two public domain designs, namely the KVLCC2 tanker (KRISO VLCC, developed by KRISO) and the DTC container ship (Duisburg Test Case, developed by Universität Duisburg-Essen) as well as a RoPax ferry design, which is a proprietary hull design of a member of the SHOPERA consortium. The tests have been distributed among the four research institutes to benefit from the unique possibilities of each facility and to gain added value by establishing data sets for the same hull model and test type at different under keel clearances (ukc). This publication presents the scope of the SHOPERA model test program for the two public domain hull models — the KVLCC2 and the DTC. The main particulars and loading conditions for the two vessels as well as the experimental setup is provided to support the interpretation of the examples of experimental data that are discussed. The focus lies on added resistance at moderate speed and drift force tests in high and steep regular head, following and oblique waves. These climates have been selected to check the applicability of numerical models in adverse wave conditions and to cover possible non-linear effects. The obtained test results with the KVLCC2 model in deep water at CEHIPAR are discussed and compared against the results obtained in shallow water at Flanders Hydraulics Research. The DTC model has been tested at MARINTEK in deep water and at Technische Universität Berlin and Flanders Hydraulics Research in intermediate/shallow water in different set-ups. Added resistance and drift force measurements from these facilities are discussed and compared. Examples of experimental data is also presented for manoeuvring in waves. At MARINTEK, turning circle and zig-zag tests have been performed with the DTC in regular waves. Parameters of variation are the initial heading, the wave period and height.

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