[논문]A Numerical Study on the Flow around a Rudder behind Low Speed Full Ship

Lee, Young-Gill; Yu, Jin-Won; Kang, Bong-Han; Pak, Kyung-Ryeung

A Numerical Study on the Flow around a Rudder behind Low Speed Full Ship 원문보기

Journal of ship and ocean technology, v.12 no.2, 2008년, pp.41 - 52

Lee, Young-Gill (Department of Naval Architecture and Ocean Engineering, Inha University) , Yu, Jin-Won (Department of Naval Architecture, Graduate School of Inha University) , Kang, Bong-Han (Department of Naval Architecture and Ocean Engineering, Inha University) , Pak, Kyung-Ryeung (Department of Naval Architecture, Graduate School of Inha University)

Abstract ▼ AI-Helper

The development of a high-lift rudder is needed because low speed full ships such as the VLCC(Very Large Crude oil Carrier) have difficulty for obtaining enough lifting force from a common rudder. The rudder of a ship is generally positioned behind the hull and propeller. Therefore, rudder design should consider the interactions between hull, propeller, and rudder. In the present study, the FLUENT code and body fitted mesh systems generated by the GRIDGEN program are adopted for the numerical simulations of flow characteristics around a rudder that is interacting with hull and propeller. Sliding mesh model(SMM) is adopted to analyze the interaction between propeller rotation and wake flow behind hull. Several numerical simulations are performed to compare the interactions such as hull-rudder, propeller-rudder, and hull-propeller-rudder. Also, we consider relationships between the interactions. The results of present numerical simulations show the variation of flow characteristics by the interaction between hull, propeller, and rudder, and these results are compared with an existing experimental result. The present study demonstrates that numerical simulations can be used effectively in the design of high-lift rudder behind low speed full ship.

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문제 정의

This study is performed in order to numerically determine the flow characteristics and pressure distributions around the rudder device in case that it is placed at the wake of propeller and hull about a low speed full ship. Several computations are carried out to find out how the stem or propeller affects the rudder for the cases of hull-rudder, propellerrudder, and hull-propeller-rudder interactions.

가설 설정

3) The changed ratio of the coefficient of lifting force along the interaction with the hullpropeller-rudder is almost the same between the experimental results and computational results. Therefore, numerical computations could confirm that changes in pressure characteristics and flow around the rudder with the effects of hull and propeller wake.

제안 방법

In this study, we consider the effect of the hull on the rudder, the effect of the propeller on the rudder, and the influence of the interaction generated from the hull and the propeller on the rudder simultaneously, because we wish to determine the effect of the hull and propeller on the rudder based on computational results from CASE 1 to CASE 4.
(After Perpendicular). The length of velocity use dimensionless value using the length of inflow velocity in this study. The rudder is turned to the right in the picture, so the slope of the rudder made the velocity distribution at the right part of the hull widen.
The purpose of present study is to visualize the changes of flow characteristics around a rudder caused by ship hull and propeller taking the advantage of numerical methods. We then examine the value of using CFD analysis to design high-lift rudders

대상 데이터

The grid is formed from the center of the hull to the stem due to limited computational capacity. The propeller is a fixed four-blade model provided by the part library of AUTOSHIP, and the rudder utilize NACA0015 as the section shape. The rudder stock is left out because of the difficulty of 으euerating grid.

이론/모형

This method used the results from steady flow analysis using the MRF scheme as the initial condition. In this research, the SMM scheme is used for the consideration of the interaction between the revolution of propeller and ship hull. Firstly, it is then computed using the MRF scheme, and the results are used as the initial conditions.
In this research, the body fitted grids are formed using the widely-used GRIDGEN 15.09 program, and numerical values are estimated using the FLUENT 6.3 code. Present research uses several schemes and models as shown in Table 1, which is effective for the computation of NACA0015 as the section of rudder in a turbulent flow model(Standard k-£ model, Sarraf et aL 2005)

성능/효과

2) It is known that the direct access to interaction with hull-propeller-rudder needs, because it is difficult to predict interaction with hull-propeller-rudder through interaction with hull-rudder, propeller-rudder.

참고문헌 (13)

Boo, K.T., Y.H. Ji, Y.S. Kim and S.C. Shin. 2004. A Numerical Study of Hydrodynamic Forces Acting on Rudders. Journal of the Society of Naval Architects of Korea, 41, 2, 61-69

원문보기 상세보기
Boo, K.T., C.B. Hong and K.J. Lee. 2004. Simulation of viscous flow around the ship appended with the propeller and the rudder. Proceedings of the Annual Autumn Meeting The Society of Naval Architects of Korea, Sancheong, 527-531
Choi, J.E. and J.H. Kim. 2008. FLOW CHARACTERISTICS AROUND A RUDDER IN OPEN LATER CONDITION, Journal of computational fluids engineering, 13, 1, 14-20
Kim, D.S. and H.T. Kim. 2002. Analysis of Open-Water Characteristics of Marine Propeller by Computational Method for Viscous Flow. Journal of the Society of Naval Architects of Korea, 39, 3, 8-17
Kong, D.-S., J.-M. Han and J.-M. Lew. 2002. A Study on the Pressure Distributions of Horn Rudder Operating in Ship's Wake. Journal of the Society of Naval Architects of Korea, 39, 2, 1-10
Lee, H.S., S.A. Kinnas, H. Gu and S. Natarajan. 2003. Numerical modeling of rudder sheet cavitation including propeller/rudder interaction and the effects of a tunnel. Fifth International Symposium on Cavitation(CAV2003)
Lee, S.H. 2007. Marine High Lifting Rudder Device and a Development of Application Technology. Report No. ROA-2007-000-10028-0, Ministry of Science and Technology, South Korea
Molland, A.F. and S.R. Turnock. 2002. FLOW STRAIGHTENING EFFECTS ON A SHIP RUDDER DUE TO UPSTREAM PROPELLER AND HULL. Int. Shipbuild. Progr., 49, 3, 195-214
Park, J.-J, Y.-B. Choi and Y.-S. Hwang. 2004. A Study on the characteristics of viscous flows around a Hull by Propeller effect. Proceedings of the Annual Autumn Meeting The Society of Naval Architects of Korea, Sancheong, 583-588
Park, J.-J., Y.-H. Jang and Y.-B. Choi. 2007. A CFD analysis on the rudder design considering the hull and propeller rotation. Proceedings of the Annual Autumn Meeting The Society of Naval Architects of Korea, Jeju, 1183-1188
Sarraf, C., R. Jaouen, H. Djeridi and J.Y. Billard. 2005. Investugation of thickness effects on 2D NACA symmetric foils. IEEE, 1298-1303
Simonsen, C.D. 2000. Rudder, Propeller and Hull interaction by RANS. Department of Naval Architecture & Offshore Engineering Technical University of Denmark
Turnock, S.R. and A.F. Molland. 2000. Directly coupled fluid structural model of a ship rudder behind a propeller, Marine Structures 13 (2000). 53-72

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A Numerical Study on the Flow around a Rudder behind Low Speed Full Ship 원문보기

Abstract ▼ AI-Helper

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A Numerical Study on the Flow around a Rudder behind Low Speed Full Ship 원문보기

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