CFD based form factor determination method

OCEAN ENGINEERING

卷:220

Article

Korkmaz, Kadir Burak^1,2  Werner, Sofia¹  Sakamoto, Nobuaki³  Queutey, Patrick⁴  Deng, Ganbo⁴  Gao Yuling⁵  Dong Guoxiang⁵  Maki, Kevin⁶  Ye, Haixuan⁶  Akinturk, Ayhan⁷  Sayeed, Tanvir⁷  Hino, Takanori⁸  Feng Zhao⁹  Tezdogan, Tahsin¹⁰  Demirel, Yigit Kemal¹⁰  Bensow, Rickard² 

[1] SSPA Sweden AB, Chalmers Tvargata 10,Box 24001, SE-40022 Gothenburg, Sweden

[2] Chalmers Univ Technol, Gothenburg, Sweden

[3] Natl Maritime Res Inst NMRI, Mitaka, Tokyo, Japan

[4] Ecole Cent Nantes, LHEEA, CNRS, Nantes, France

[5] Shanghai Ship & Shipping Res Inst SSSRI, Shanghai, Peoples R China

[6] Univ Michigan, CSHL, Ann Arbor, MI 48109 USA

[7] NRC, Ocean Coastal & River Engn OCRE, Corner Brook, AB, Canada

[8] Yokohama Natl Univ, Yokohama, Kanagawa, Japan

[9] China Ship Sci Res Ctr CSSRC, Wuxi, Jiangsu, Peoples R China

[10] Univ Strathclyde, Glasgow, Lanark, Scotland

关键词: Ship resistance;    Form factor;    CFD;    Scale effects;    Combined CFD/EFD Methods;    Experimental uncertainty analysis;   

DOI  :  10.1016/j.oceaneng.2020.108451

来源: Elsevier

【 摘 要 】

The 1978 ITTC Power Prediction method is used to predict the propulsive power of ships through towing tank testing. The form factor approach and its determination in this method have been questioned. This paper investigates the possibility to improve the power predictions by introducing Combined CFD/EFD Method where the experimental determination of form factor is replaced by double body BANS computations applied for open cases KVLCC2 and KCS, including first-time published towing tank tests of KVLCC2 at ballast condition including an experimental uncertainty analysis specifically derived for the form factor. Computations from nine organisations and seven CFD codes are compared to the experiments. The form factor predictions for both hulls in design loading condition compared well with the experimental results in general. For the KVLCC2 ballast condition, majority of the form factors were under-predicted while staying within the experimental uncertainty. Speed dependency is observed with the application of ITTC57 line but it is reduced with the Katsui line and nearly eliminated by numerical friction lines. Comparison of the full-scale viscous resistance predictions obtained by the extrapolations from model scale and direct full-scale computations show that the Combined CFD/EFD Method show significantly less scatter and may thus be a preferred approach.

【 授权许可】

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