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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Teknik ITS IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science Jurnal Kelautan Nasional Wave: Jurnal Ilmiah Teknologi Maritim Archipelago Engineering Makara Journal of Technology
I Ketut Aria Pria Utama
Jurusan Teknik Perkapalan Institut Teknologi Sepuluh Nopember
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Journal : KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan

 1 
Kajian Interferensi Koefisien Hambatan pada Lambung Katamaran melalui Komputasi ’Slender Body Method Jamaluddin, Andi; Utama, I Ketut Aria Pria; Hamdani, M.Arief
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 7, No 2 (2010): Juni
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (604.668 KB) | DOI: 10.14710/kpl.v7i2.3772

Abstract

The past decade has witnessed a rapid growth of interest in the development of fast catamaran for various applications. The paper describes the study of interference resistance components on demihull separation. Catamarans or twin-hull vessels may be formed either by connecting two symmetrical demihulls or by splitting a mono hull into two halves to form two asymmetric demihulls. The slender body method in HullSpeed- Maxsurf Program was used for predicting the resistance components. The method assumes that the ship’s beam is small compared to its length. Effect of resistance interference components on catamaran hull separations are explained and discussed with some work from other published data, which shows good agreement.
Wind Tunnel Investigation into the Resistance Analysis of Slender Body Catamaran Utama, I Ketut Aria Pria; Sutiyo, S; Suwasono, Bagiyo
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 17, No 2 (2020): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2544.9 KB) | DOI: 10.14710/kapal.v17i2.29867

Abstract

The Wind tunnel investigation of a slender body catamaran was conducted in order to determine its resistance characteristics, namely the effect of pressure and flow velocity changes for varied hull separation. The catamaran was tested in a wind tunnel belongs to Department of Mechanical Engineering, ITS, with hull separations of  S/L = 0.2 to 0.4 and variation in Reynolds numbers up to 4.46 x 105. Pressure around the hull was measured using pressure tappings and the flow velocity behind the hull was also measured using a Pitôt-static tube. The experimental study shows that the pressure coefficient decreases when the hull separation declines and conversely, the flow velocity increases. The tests demonstrated a viscous interaction between the hulls, and form factors for the monohull and catamaran are derived. The demihull exhibited a form factor (1+k) of 1.265 and in the catamaran mode, the measured form factor (1+βk) was between 1.416 and 1.403. The results are in agreement with other published data.
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

Abstract

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.
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

Abstract

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.
Co-Authors Adi Wirawan Husodo Ahmad Charizzaka Andi Jamaluddin Andrew Gibson Aryo Tri Septya Nugraha Bagiyo Suwasono Baital, Muh. Sawal Dian Purnamasari Dian Purnamasari Dita Adhelia Putri Endah Suwarni Endah Suwarni Fajar Adi Pratama Garry Raditya Putra Giles Anthony Thomas Hery Indria Dwi Puspita I Ketut Suastika I Made Ariana Kurniawati, Fiqih Dwi M. Zain Fajar Ramadhani M.Arief Hamdani Muhammad Hafiz Nurwahyu Aliffrananda Murdijanto Murdijanto Noor Muhammad Ridha Nurhadi Nurhadi Pradipta Rahman Hakim Rahmat Diko Edfi Richard Benny Luhulima Robi Wahyudi Sugeng Riyadi Sutiyo Sutiyo Sutiyo, S Teguh Putranto Zhafir Tri Setiabudi Putra