[논문]CFD Application for Prediction of Ship Added Resistance in Waves

Kim, Byung-Soo; Kim, Yonghwan

doi:10.5574/jaroe.2018.4.3.135

[국내논문] CFD Application for Prediction of Ship Added Resistance in Waves 원문보기

Journal of advanced research in ocean engineering, v.4 no.3, 2018년, pp.135 - 145

Kim, Byung-Soo (Department of Naval Architecture & Ocean Engineering, Seoul National University Seoul) , Kim, Yonghwan (Department of Naval Architecture & Ocean Engineering, Seoul National University Seoul)

Abstract ▼ AI-Helper

This paper deals with the added resistance of a ship in waves using computational fluid dynamics (CFD). The ship added resistance is one of the key considerations in the design of energy-efficient ship. In this study, the added resistance of a LNG carrier in head waves is computed using a CFD code to consider the nonlinearity and the viscous effects. The unsteady Reynolds Averaged Navier-Stokes equation (RANS) is numerically solved and the volume of fluid (VOF) approach is used to simulate the free surface flows. The length of incident wave varies from half the ship length to twice the ship length. To investigate the nonlinearity effect, both the linear wave condition and the nonlinear wave condition are considered. The heave and pitch motions are calculated along with the added resistance, and the wave contours are obtained. Grid convergence test is conducted thoroughly to achieve the converged motion and resistance values. The calculated results are compared and validated with experimental data.

Keyword

표/그림 (15)

그림 Fig. 1. LNG carrier model
표 Table 1. LNG carrier properties
그림 Fig. 2. Computation domain for the unsteady ship resistance calculation
그림 Fig. 3. Grid for the computation generated using Star-CCM+
그림 Fig. 4. Bow shape depending on the base mesh size
표 Table 2. Dependency test on base mesh size
그림 Fig. 5. Calculated half body mass depending on base mesh size
그림 Fig. 7. Dependency test on overset region breadth
그림 Fig. 6. Grid convergence test
그림 Fig. 8. Heave RAOs for the LNG carrier (H/λ = 1/40, and Fn = 0.188)
그림 Fig. 9. Pitch RAOs for the LNG carrier (H/λ = 1/40, and Fn = 0.188)
표 Table 3. Dependency test on overset region breadth
그림 Fig. 10. Added resistance RAOs for the LNG carrier (H/λ = 1/40, and Fn = 0.188)
그림 Fig. 11. Wave contours for the LNG carrier (H/λ = 1/40, and Fn = 0.188)
그림 Fig. 12. Time series for the LNG carrier in waves (H/λ = 1/40, and Fn = 0.188)

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제안 방법

5 of the real ship. The calculation was performed in deep-sea conditions with regular head waves. The Froude number (Fn) is defined in equation (1), and U is the ship velocity, g is gravity, and L is the ship length.

대상 데이터

In this study, a liquefied natural gas (LNG) carrier provided by Samsung Heavy Industries was used for the calculation. The hull properties are described in Fig.
For the simulation, the model ship was scaled to 1/72.5 of the real ship. The calculation was performed in deep-sea conditions with regular head waves.

이론/모형

In this study, a CFD method was used to analyze the motion and added resistance of a given ship with head sea conditions. As CFD results are highly dependent on generated grids, several mesh generations tests are conducted to demonstrate the convergence of the results.
The integrated governing equations are discretized and solved using the finite volume method. The semi-implicit method for pressure linked equations algorithm is adopted to solve the pressure–velocity coupling problem.
An adaptive mesh model was applied using the Star-CCM+ mesh generator with a trimmer, surface remesher, and prism layer meshing model. The trimmer mesh model was used to generate meshes having a hexahedron shape, and the surface remesher was used to copy the hull shape more precisely.

참고문헌 (9)

Kim, J, O'Sullivan, J, Read, A (2012), "Ringing Analysis of a Vertical Cylinder by Euler Overlay Method", Proc 31st International Conference on Ocean, Offshore and Arctic Engineering, OMAE2012
Kim, T, Yoo, S, Oh, S, Kim, HJ, Lee, D, and Kim, B (2017), "Numerical and Experimental Study on the Estimation of Added Resistance of an LNG Carrier in Waves", Proc 27th International Ocean and Polar Engineering Conference, 746-752
Lee, J, Park, DM, Kim, Y (2016), "Experimental investigation on the added resistance of modified KVLCC2 hull forms with different bow shapes", Journal of Engineering for the Maritime Environment, 231(2), 395-410
Peric, M (2012). "Wave Impact, Body Motion and Overset Grids in STAR-CCM+", STAR South East Asian Conference 2012
Sadat-Hosseini, H, Wu, PC, Carrica, PM, Kim, H, Toda, Y, Stern, F (2013). "CFD verification and validation of added resistance and motions of KVLCC2 with fixed and free surge in short and long head waves", Ocean Engineering, 59, 240-273

상세보기
Seo, MG, Yang, KK, Park, DM, Kim, Y (2014). "Numerical analysis of added resistance on ships in short waves", Ocean Engineering, 87, 97-110

상세보기
Tezdogan, T, Demirel, YK, Kellett, P, Khorasanchi, M, Incecik, A, Turan, O (2015). "Full-scale unsteady RANS CFD simulations of ship behavior and performance in head seas due to slow steaming", Ocean Engineering, 97, 186-206
Yang, KK, Kim, Y, Nam, BW (2015). "Cartesian-grid-based computational analysis for added resistance in waves", Journal of Marine Science and Technology, 20, 155-170
Yang, KK, and Kim, Y (2017). "Numerical Analysis of Added Resistance on Blunt Ships with Different Bow Shapes in Short Waves", Journal of Marine Science and Technology, 22(2), 245-258

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