Effects of the Application of a Stern Foil on Ship Resistance: A Case Study of an Orela Crew Boat

• Main Authors: Ketut Suastika, Affan Hidayat, Soegeng Riyadi
• Format: Article
• Language: English
• Published: Universitas Indonesia 2017-12-01
• Series: International Journal of Technology
• Subjects: Computational fluid dynamics (CFD); Planing-hull crew boat; Ship resistance; Stern foil; Towing tests
• Online Access: http://ijtech.eng.ui.ac.id/article/view/691
• ISSN: 2086-9614; 2087-2100

The effects of the application of a stern hydrofoil on ship resistance were studied numerically using computational fluid dynamics (CFD) and were verified using data from model tests. A 40 m planing-hull Orela crew boat, with target top speed of 28 knots (Froude number, Fr = 0.73), was considered. The stern foil (NACA 64(1)212) was installed with the leading edge positioned precisely below the transom with angle of attack of 2 degrees at elevation 0.853 T below the water surface (where T is the boat’s draft). At relatively low speed (Fr < ~0.45) the application of a stern foil results in an increase in ship resistance (of up to 13.9%), while at relatively high speed (Fr > ~0.55) it results in a decrease in ship resistance (of up to 10.0%). As the Froude number increases, the resistance coefficient (CT) first increases, reaches a maximum value, and then decreases. Its maximum value occurs at Fr ? 0.5, which is consistent with the prediction of a resistance barrier at approximately this Froude number.