Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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A Study on the Scale Effect and Improvement of Resistance Performance Based on Running Attitude Control of Small High-Speed Vessel

소형 고속선박의 항주자세 제어에 따른 저항성능 개선 및 축척 효과에 관한 연구

  • Lee, Jonghyeon (Shipbuilding & Marine Simulation Center, Tongmyong University) ;
  • Park, Dong-Woo (School of Naval Architecture & Ocean Engineering, Tongmyong University)
  • 이종현 (동명대학교 조선해양시뮬레이션센터) ;
  • 박동우 (동명대학교 조선해양공학부)
  • Received : 2021.05.10
  • Accepted : 2021.06.28
  • Published : 2021.06.30
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Abstract

In this study, a trim tab on the stern hull of a small high-speed vessel of approximately 10 m length sailing at a Froude number of 1.0 was designed for energy efficiency. The running attitude and resistance performance of the bare hull and trim tab hull at several angles to the base line were analyzed for model and full scale ships using computational fluid dynamics, and compared to investigate the scale effect. The analysis results for the bare hull were quite similar, but a difference in the attitude control under same conditions of the trim tab was observed, resulting in the total resistance error. However, there was no significant difference in tendency of the variation in the resistance with the attitude. Thus, the optimum running attitude could be determined from the tendency despite the scale effect, but a full scale analysis is required to analyze the control of the attitude by the trim tab and flow characteristics near the full scale ship.

본 연구에서는 Froude 수 1.0으로 운항하는 길이 약 10m 급 소형 고속선박의 에너지 효율 설계를 위해 선미부에 트림 탭을 부착하였고, 선저 면과의 각도에 따른 항주자세와 저항성능의 변화를 살펴보았다. 성능 해석은 CFD 해석을 통해 수행되었으며, 축척에 의한 영향을 보기 위해 모형선과 실선에 대해 각각 해석을 수행 후 두 결과로부터 예측된 실선의 성능을 비교하였다. 나선에 대한 해석 결과는 두 결과가 전반적으로 유사하였고, 트림 탭이 부착된 경우 선저 면과의 각도가 동일할 때 자세 변화량이 달라 전 저항의 차이로 이어졌지만 자세에 따른 저항 변화 경향은 유사하였다. 이로부터 축척 효과가 있더라도 저항 저감 경향으로부터 최적 항주자세를 찾을 수 있으나, 트림 탭에 의한 자세 변화와 실선 주위 유동의 특성을 알기 위해서는 실선에 대한 직접적인 해석이 필요함을 알 수 있다.

Keywords

Acknowledgement

이 연구는 2019학년도 동명대학교 교내학술연구비 지원을 받아 수행되었습니다(2019A021-1).

References

  1. Arolla, S. K. and P. A. Durbin(2013), Modeling Rotation and Curvature Effects within Scalar Eddy Viscosity Model Framework, International Journal of Heat and Fluid Flow, Vol. 39, pp. 78-89. https://doi.org/10.1016/j.ijheatfluidflow.2012.11.006
  2. CD-adapco(2018), STAR-CCM+ User Guide, Ver. 13.02.
  3. Courant, R., K. Friedrichs, and H. Lewy(1967), On the Partial Difference Equations of Mathematical Physics, International Business Machines Corporation (IBM) Journal of Research and Development, Vol. 11, No. 2, pp. 215-234.
  4. Deng, G. B., R. Duvigneau, P. Queutey, and M. Visonneau (2004), Assessment of Turbulence Model for Ship Flow at Full Scale, 6th World Congress on Computational Mechanics (WCCM), Beijing, September 2004.
  5. Farkas, A., N. Degiuli, and I. Martic(2018), Assessment of Hydrodynamic Characteristics of a Full-scale Ship at Different Draughts, Ocean Engineering, Vol. 156, pp. 135-152. https://doi.org/10.1016/j.oceaneng.2018.03.002
  6. Ferziger, J. H. and M. Peric(2002), Computational Methods for Fluid Dynamics, 3rd Edition, Springer, Germany, pp. 292-294.
  7. Forgach, K. M.(2001), Comparison of ITTC78 and DTMB Standard Ship Performance Prediction Methods, Maryland: David Taylor Model Basin (DTMB).
  8. Harvald, S. A.(1983), Resistance and Propulsion of Ships, John Wiley & Sons, USA, pp. 98-100.
  9. Hochkirch, K. and Mallol, B.(2013), On the Importance of Full-Scale CFD Simulations for Ships, Proceedings of the 12th International Conference on Computer Applications and Information Technology in the Maritime Industries (COMPIT), Cortona, April 2013, pp. 85-95.
  10. ITTC(1999), International Towing Tank Conference, Performance, Propulsion, 1978 ITTC Performance Prediction Method, Recommended Procedures and Guidelines, 7.5-02-03-01.4, pp. 3-4.
  11. ITTC(2011), International Towing Tank Conference, Fresh Water and Seawater Properties, Recommended Procedures, 7.5-02-01-03, pp. 3-9.
  12. ITTC(2014), International Towing Tank Conference, Practical Guidelines for Ship CFD Applications, Practical Guidelines for Ship CFD Applications, 7.5-03-02-03, pp. 16.
  13. ITTC(2017), International Towing Tank Conference, Uncertainty Analysis in CFD, Verification and Validation Methodology and Procedures, Recommended Procedures and Guidelines, 7.5-03-01-01, pp. 4-8.
  14. Niklas, K. and H. Pruszko(2019), Full Scale CFD Seakeeping simulations for Case Study Ship Redesigned from V-shaped Bulbous Bow to X-bow Hull Form, Applied Ocean Research, Vol. 89, pp. 188-201. https://doi.org/10.1016/j.apor.2019.05.011
  15. Sarkar, S. and L. Balakrishnan(1991), Application of a Reynolds-stress Turbulence Model to the Compressible Shear Layer, American Institute of Aeronautics and Astronautics (AIAA) Journal, Vol. 29, No. 5, pp. 743-749. https://doi.org/10.2514/3.10649
  16. Spalart, P. R. and C. L. Rumsey(2007), Effective Inflow Conditions for Turbulence Models in Aerodynamic Calculations, American Institute of Aeronautics and Astronautics (AIAA) Journal, Vol. 45, No. 10, pp. 2544-2553. https://doi.org/10.2514/1.29373
  17. Todd, F. H.(1957), Skin Friction and Turbulence Stimulation, Proceedings of the 8th ITTC Conference, Madrid, September 1957, pp. 71-227.