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CFD Analysis into the Resistance of Trimaran with Longitudinal Sidehull Adjustments Luhulima, Richard Benny; Sutiyo, Sutiyo; Utama, I Ketut Aria Pria
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 18, No 3 (2021): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v18i3.41010

There has recently been a surge in demand for multi-hull vessels for military and commercial purposes. The need for multi-hull ships increase from the necessity to balance speed and cargo requirements. Among others, the trimaran is one such hull type. The current study performs a CFD resistance analysis for trimaran as a parameter range of feasible hull forms based on the NPL systematic series. The resistance of trimaran hull shapes are calculated using CFXTM, a commercial CFD code that belongs to ANSYS. The trimaran model was tested at one fixed transverse separation (S/L=0.2) together with 3 longitudinal separations, R/L=0, 0.25, and 0.5, at different Froude numbers (based on length) from 0.2 to 0.6. Testing on the individual hull is also carried out to quantify the effect of resistance interference on the trimaran configuration. The CFD simulation results indicate that the trimaran model with side hulls parallel to the stern (R/L=0) has the least resistance. The interference effect of resistance on Trimaran with R/L=0, 0.25, 0.5 are 2.8%, 4.6%, 6.8% as opposed to non-interference trimaran model, respectively. These findings provide an approach for appropriately selecting the trimaran model with longitudinal side hull configurations.

PENGEMBANGAN TYPE PROPELLER B-SERIES PADA KAPAL SELAM MINI 22 M Luhut Tumpal Parulian Sinaga; Sutiyo Sutiyo; Setyo Lekosono
Prosiding Semnastek PROSIDING SEMNASTEK 2017
Publisher : Universitas Muhammadiyah Jakarta

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Kapal selam mini 21 meter dengan diameter hull 3 meter dan displacement 113,9 T sangat cocok untuk perairan Indonesia barat yang dangkal karena memiliki beberapa kelebihan. Perhitungan powering terutama tahanan kapal dilakukan dengan menggunakan metode MIT dan metode kapal pembanding untuk mendapatkan koefisien Admiral. Berdasar dari hasil perhitungan kedua metode tersebut dilakukan perancangan propeller dengan menggunakan Propeller B series. Penggunaan propeller B-series lebih disebabkan karena kelengkapan data dan informasi performa propeller seri tersebut bila dibandingkan dengan seri propeller lainnya. Dari analisa kebutuhan thrust dan ketersediaan daya mesin, maka propeller B5-60 ternyata layak dipakai sebagai propulsor kapal selam mini 22 mKata kunci: propeller, B-series, kapal selam mini, daya, trust

PENGEMBANGAN TYPE PROPELLER B-SERIES PADA KAPAL SELAM MINI 22 M Luhut Tumpal Parulian Sinaga; Sutiyo Sutiyo; Setyo Lekosono
Prosiding Semnastek PROSIDING SEMNASTEK 2017
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Kapal selam mini 21 meter dengan diameter hull 3 meter dan displacement 113,9 T sangat cocok untuk perairan Indonesia barat yang dangkal karena memiliki beberapa kelebihan. Perhitungan powering terutama tahanan kapal dilakukan dengan menggunakan metode MIT dan metode kapal pembanding untuk mendapatkan koefisien Admiral. Berdasar dari hasil perhitungan kedua metode tersebut dilakukan perancangan propeller dengan menggunakan Propeller B series. Penggunaan propeller B-series lebih disebabkan karena kelengkapan data dan informasi performa propeller seri tersebut bila dibandingkan dengan seri propeller lainnya. Dari analisa kebutuhan thrust dan ketersediaan daya mesin, maka propeller B5-60 ternyata layak dipakai sebagai propulsor kapal selam mini 22 mKata kunci: propeller, B-series, kapal selam mini, daya, trust

Numerical Analysis on Added Resistance of a Crew Boat with Variation of Wave Period Dita Adhelia Putri; Muhammad Hafiz Nurwahyu Aliffrananda; Sugeng Riyadi; Sutiyo Sutiyo; I Ketut Aria Pria Utama
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.48615

Crew boat is a type of vessels used for the mobility of offshore workers and logistical supply needed for the offshore platform. Crew boat KCT-1901 is categorized as a planning boat with hard chine body. KCT-1901 requires an added power when it is sailing through a seaway. The reason behind this is because when a ship sails through a seaway, the ships experienced a heave and pitch motion resulted in added resistance and hence added power. The goal of the investigation is to estimate added resistance and added power of the crew boat using computational fluid dynamic (CFD) method and tested in calm water and in waves with several Froude numbers (Fr) and wave periods. A method developed by Savitsky is used for verification at high-speed mode. The largest total resistance using CFD in calm water is 38.98 kN and using Savitsky method is 39.00 kN obtained at Fr 0.72. Both are in good agreement and the discrepancy is less than 0.1%. Comparative study was carried out against experimental test in a towing tank. The drag forces tested at Fr 0.12 and 0.24, between the two approaches, showed a discrepancy of about 4%. Further CFD test was conducted on wave pattern analysis, which demonstrated that as the Fr increases the becomes clearer and stronger and tests in waves condition at lower wave period showed that the transverse wave becomes more apparent. Therefore, overall can be said that the CFD simulation showed such a good agreement with empirical Savitsky method and experimental tank test.

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