NUMERICAL ANALYSIS OF MODIFIED ANGLE OF ENTRANCE AND DUCKTAIL ADDITION OF THE 1,500 GT RO-RO FERRY HULL VALIDATED WITH SHIP MODEL RESISTANCE TEST

Cahyadi Sugeng Jati  Mintarso; Semin Semin; Erwandi Erwandi; Dian  Purnamasari

doi:10.11113/jurnalteknologi.v85.19576

Authors

Cahyadi Sugeng Jati Mintarso ᵃDepartment of Marine Engineering, Faculty of Marine Technology, Institut Teknologi Sepuluh Nopember (ITS), Keputih, Sukolilo, Surabaya, 60111, Indonesia ᵇThe National Research and Innovation Agency, Jl. Hidrodinamika, Keputih, Kec. Sukolilo, Surabaya, Indonesia, 60112, Indonesia https://orcid.org/0009-0001-0632-8619
Semin Semin Department of Marine Engineering, Faculty of Marine Technology, Institut Teknologi Sepuluh Nopember (ITS), Keputih, Sukolilo, Surabaya, 60111, Indonesia
Erwandi Erwandi The National Research and Innovation Agency, Jl. Hidrodinamika, Keputih, Kec. Sukolilo, Surabaya, Indonesia, 60112, Indonesia https://orcid.org/0000-0003-3200-0550
Dian Purnamasari The National Research and Innovation Agency, Jl. Hidrodinamika, Keputih, Kec. Sukolilo, Surabaya, Indonesia, 60112, Indonesia

DOI:

https://doi.org/10.11113/jurnalteknologi.v85.19576

Keywords:

Angle of entrance, computational fluid dynamics (CFD), ducktail, towing tank, resistance test

Abstract

The main problem of ferry ships is maintaining the speed due to ship resistance. There are many efforts to reduce the resistance by modifications of them. This study aims to reduce resistance due to modification of the hull form on the bow Angle of Entrance (AoE) and ducktail addition at the transom stern. The object of the research is a 1,500 GT ro-ro ferry. The AoE minimizes wave resistance and improves flow patterns, while the ducktail reduces the negative effects of the circulation zone on the wetted transom so that waves and wake are reduced. Computational Fluid Dynamics (CFD) was used to analyze these modifications. The final results of the numerical simulation are then verified by the ship model resistance test in the towing tank. Tests were conducted in calm water conditions at a draft of 3.30 meters with a speed variation of 10 - 18 knots. The results show that with the combination of AoE and Ducktail, at ship speeds of 13 to 18 knots, the reduction in resistance from CFD ranges from 13.13% - 16.69% while the experimental results range from 16.00% - 16.54%. While separately the AoE modification is between 8.89% – 12.19% and ducktail is 3.12% -3,62%.

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