• Vol 8, No 1 (2017)
  • Mechanical Engineering

Parallel-middle-body and Stern-form Relative Significance in the Wake Formation of Single-screw Large Ships

Ketut Suastika, Fajar Nugraha, I Ketut Aria Pria Utama


Publish at : 30 Jan 2017 - 00:00
IJtech : IJtech Vol 8, No 1 (2017)
DOI : https://doi.org/10.14716/ijtech.v8i1.3542

Cite this article as:
Suastika, K.., & Nugraha, F..& Utama, I.K.A.P.. 2017. Parallel-middle-body and Stern-form Relative Significance in the Wake Formation of Single-screw Large Ships. International Journal of Technology. Volume 8(1), pp.94-103
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Ketut Suastika Department of Naval Architecture and Shipbuilding Engineering, Faculty of Marine Technology, Institut Teknologi Sepuluh Nopember (ITS), Kampus ITS Sukolilo, Surabaya 60111, Indonesia
Fajar Nugraha PT. Biro Klasifikasi Indonesia (BKI), Jl. Yos Sudarso 38-40, Tanjung Priok, Jakarta 14320, Indonesia
I Ketut Aria Pria Utama Department of Naval Architecture and Shipbuilding Engineering, Faculty of Marine Technology, Institut Teknologi Sepuluh Nopember (ITS), Kampus ITS Sukolilo, Surabaya 60111, Indonesia
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Abstract

The relative significance of the parallel middle body and stern form in the wake formation of single-screw large ships and their contribution to the ship’s viscous resistance are studied by using computational fluid dynamics (CFD). A 10450-DWT tanker is considered by varying the ratio of the parallel-middle-body’s length to the ship’s length (Lmb/L) and by varying the shape of the stern form from a V-like to a U-like underwater stern transom section. In all the calculations, the principal dimension and the displacement of the ships are kept constant. A larger value for the parallel-middle-body relative length (Lmb/L) of ships with the same stern form results in a larger drag coefficient but does not affect the nominal wake fraction significantly. A change in the shape of the underwater stern form, from a V-like to a U-like section, results in a much larger drag coefficient ascribed to the much larger wake fraction. The stern form dominantly affects the nominal wake fraction and the ship’s viscous resistance compared to the parallel-middle-body relative length.

CFD; Parallel middle body; Ship resistance; Stern form; Wake fraction