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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Archipelago Engineering
Richard Benny Luhulima
Universitas Pattimura
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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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

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.
STUDI KORELASI HAMBATAN DAN SEAKEEPING KAPAL TRIMARAN UNTUK DAERAH PERAIRAN MALUKU Richard Benny Luhulima; Fella Gaspersz; Ruth P. Soumokil
ALE Proceeding Vol 1 (2018): Archipelago Engineering (ALE)
Publisher : Fakultas Teknik Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ale.1.2018.63-69

Abstract

Perairan Maluku termasuk tipikal perairan yang relatif tenang diantara pulau-pulau yang berdekatan dan sangat bergelombang untuk laut yang terbuka dan jarak antara pula-pulau yang cukup berjauhan. Penelitian difokuskan pada perhitungan hambatan dan dilanjutkan dengan perhitungan seakeeping untuk perairan tenang dan bergelombang. Penelitian tentang hambatan dilakukan dengan teknik CFD menggunakan CFX-code dan penelitian tentang seakeeping dilakukan dengan teknik CFD (ANSYS AQWA).Hasil kajian melalui numerik menunjukkan bahwa interferensi komponen hambatan pada lambung trimaran terhadap perubahan jarak antara lambung secara melintang (S/L). Semakin kecil jarak antara lambung trimaran (S/L) maka semakin besar hambatan dan interferensi/interaksi komponen hambatan yang terjadi. Kemudian korelasi yang terlihat antara hambatan dan seakeeping adalah adanya perbedaan karena adanya interferensi semakin besar interferensi maka gerakan heave dan pitch semakin berkurang. Namun inteferensi tidak mempengaruhi terhadap gerakan roll. Hasil analisa pengujian dan numerik menunjukkan bahwa pada S/L=0,4 menunjukkan hasil yang sangat baik untuk permorma hambatan dan seakeeping. Hasil yang diperolehdibandingkandenganpublished datadanmenunjukkankesesuaianhasil yang cukupbaik. Hasil penelitian ini diharapkan dapat memperkaya dan memperkuat database dalam mempresentasikan korelasi hambatan terhadap olah gerak pada lambung kapal trimaran dan selanjutnya dapat diaplikasikan secara langsung dalam perhitungan hambatan dan seakeeping yang digunakan pada tahap desain (preliminary design).
PERBANDINGAN KAPAL MONOHULL, CATAMARAN, TRIMARAN BERDASARKAN TINJAUAN OPERASIONAL PENGGUNAAN BAHAN BAKAR Jacobus Tupan; Richard Benny Luhulima
ALE Proceeding Vol 4 (2021): Archipelago Engineering (ALE)
Publisher : Fakultas Teknik Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ale.4.2021.30-36

Abstract

In general, fishing fleets operating in Maluku waters and managed by local entrepreneurs consist of monohull and trimaran fishing vessels with outriggers. Monohull fishing vessels have limited deck space and poor transverse stability, while trimaran-type vessels have better deck space and transverse stability than monohull vessels, but because they are still in the form of outriggers, the space is limited. This study aims to examine the development of the trimaran fishing vessel in terms of energy requirements, safety, and comfort of the crew during fishing operations. The initial stage of this research begins with data analysis and the basic size of monohull fishing vessels operating in Maluku waters, from this data the shape of the trimaran hull is designed. Calculation of resistance using CFD, then analyzed the calculation of resistance and stability, safety, and comfort of the ship using Maxsurf. The drag Trimaran is 8.86% smaller than a monohull and 3.25% smaller than a catamaran. Energy Usage (EHP) is proven by trimaran ships more than other ship modes. The average trimaran period is 10.5 seconds which meets IMO standards and is declared operationally good.
Study of Purse Seine Fishing Ship Trimaran Seakeeping with Axe-Bow and Without Axe-Bow Model Using Computational Fluids Dynamics Fella Gaspersz; Agustinus Tupamahu; Richard Benny Luhulima; Simon Tubalawony
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.v20i1.47092

Abstract

Maluku waters are dominated by extreme weather conditions with wave heights of 1-5 meters. Purse seine fishingvessel is one type of fishing vessel that has very poor transverse stability. One way to improve the stability of theship is to change the shape of the monohull ship to a ship with a trimaran hull type. This research was focused onexamining the movement characteristics of purse seine fishing vessels with trimaran hull type with Axe-Bowmodification on the bow and without Axe-bow, through computational fluid dynamics. The use of Axe-bow ontrimaran is able to significantly reduce RMS Pitch, which is an average of 13.35% smaller when compared to Trimaranwithout Axe-bow. On the RMS Heave Trimaran Axe-bow can reduce an average of 5.27% if the Trimaran is withoutAxe-bow. Furthermore, the Trimaran Axe-bow is also able to reduce the RMS Roll by an average of 3.98% comparedto the Trimaran without Axe-bow. The results of this study can provide an initial description of the advantages ofusing the Axe-Bow on the Purse seine fishing trimaran ship.
Co-Authors Agustinus Tupamahu Fella Gaspersz Fella Gaspersz I Ketut Aria Pria Utama Jacobus Tupan Ruth P. Soumokil Simon Tubalawony Sutiyo Sutiyo