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All Journal Jurnal Teknologi Maritim International Conference on Maritime Technology and Its Application Proceedings Conference on Marine Engineering and its Application PROCEEDINGS CONFERENCE ON DESIGN AND MANUFACTURE AND ITS APPLICATION
Agung Purwana
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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STUDI HAMBATAN KAPAL SELAM MODEL DENGAN COMPUTATIONAL FLUID DYNAMICS (CFD) Agung Purwana
Jurnal Teknologi Maritim Vol 5 No 2 (2022): Jurnal Teknologi Maritim
Publisher : Pusat Penelitian dan Pengabdian Masyarakat (P3M) - PPNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33863/jtm.v5i2.1511

Abstract

Dalam makalah ini teknik komputasi fluid dynamic (CFD) diterapkan untuk memprediksi karakteristik hambatan total(Rt) kapal selam model Darpa Suboff dengan pendekatan Computational Fluid Dynamics (CFD) untuk berbagai kondisi kecepatan. Pertama, CFD analisis Benchmark DARPA Suboff Submarine dilakukan untuk kondisi kecepatan yang berbeda. Dalam analisis komputasi, aliran turbulen di sekitar kapal selam dimodelkan dengan Reynolds Averaged Model Navier-Stokes (RANS) dengan model turbulensi k-? SST untuk menyelesaikan persamaan-persamaan yang mengatur. Komparasi dari pendekatan CFD yang diterapkan dengan membandingkan hasil numerik dengan eksperimen hasil yang diperoleh dari literatur, dan berdasarkan grid kepadatan dalam domain komputasi. Pendekatan CFD Kapal Selam dan hasilnya dibandingkan dengan hasil Kapal Selam DARPA untuk kondisi hidrodinamika yang sama. Selanjutnya kajian ini diharapkan menjadi contoh untuk studi kapal selam baru yang akan dikembangkan dengan memperhitungkan hambatan kapal
Analisis Pengaruh Tipe Nozzle dan Tip Clerance terhadap Kinerja Propeller K-Series menggunakan Metode Computational Fluid Dynamics (CFD) Mohamad Eko Kurniawan; Agung Purwana; Abdul Gafur
Proceedings Conference on Marine Engineering and its Application Vol 6 No 1 (2023): Conference on Marine Engineering and its Aplication
Publisher : Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33863/cmea.v6i1.2669

Abstract

Many innovations have been developed in the shipbuilding industry, such as the use of waterjetand azipod propulsion systems. However, these options are considered less effective. FInally the shippingindustry has innovated by adopting ducted propeller technology. This Final Year Project aims to conductfluid flow simulation tests on the propeller with variations in nozzle sizes, namely 19A and 37 and tipclearance values of 20 mm, 30 mm, 40 mm, 50 mm, and 60 mm. The analysis is performed usingComputational Fluid Dynamics (CFD) to obtain values for thrust, torque, and efficiency. The simulationresults, the smaller tip clearance, the greater resulting thrust and torque values, namely 61874 N and 13128Nm on models with a 20 mm tip clearance. Then, the greater value of thrust or torque, the better performanceof the propeller. The largest thrust value was obtained, namely 61874 N and the largest torque, namely 13128Nm. Thus, the propeller has good performance when paired with nozzle 37. For efficiency, the better theperformance of the propeller with the recommended nozzle type and tip clearance is 37 nozzle and 20 mm tipclearance with the greatest efficiency value is at J 0.6 of 0.686.
Studi Numerik Pengaruh Sudut Kemiringan Push Nozzle pada Air Curtain Terhadap Pola Aliran Push-Pull Ventilation Muhammad Rafli Syahrizal R; Burniadi Moballa; Agung Purwana
Proceedings Conference on Marine Engineering and its Application Vol 6 No 1 (2023): Conference on Marine Engineering and its Aplication
Publisher : Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33863/cmea.v6i1.2675

Abstract

COVID-19 cases will continue to spread throughout the world until 2023, including inIndonesia, and have many negative impacts, especially for the industrial world because it is difficultto enforce a minimum distance of 1-2 meters between employees. One technology that has highpotential to be applied is the air curtain. This journal analyzes push-pull ventilation to protectworkers from microdroplet inhalation. In this study, two variations of the push-pull ventilation speedratio (Vs/Vb) were used, namely 4 and 6. As well as using a variation of the push nozzle slope, namely10°. In this study, running was carried out with two models, namely modeling without a mannequinand with a mannequin. To complete this research, simulations were carried out using theComputational Fluid Dynamics (CFD) method using Salome, OpenFOAM, and ParaView software.So, the results obtained in modeling without a mannequin, the speed ratio of 6 is the most optimalratio with the least amount of average discharge that goes out of bounds, namely 0.582 m3/s. Whilethe results of the push-pull modeling with the mannequin show that no droplets penetrate the aircurtain at all variations of the velocity ratio, the velocity ratio of 6 is the velocity ratio that has aover-blow flow pattern that is very effective in holding down spray from droplets.
DESIGN ANALYSIS OF CYLINDRICAL FLOAT TYPE WAVE EVERGY CONVERTER Dhipta Rama Samodra; Mohammad Hakam; Agung Purwana
Proceedings Conference On Design Manufacture Engineering And Its Application Vol 7 No 1 (2023): Conference On Design And Manufacture Its Application
Publisher : Proceedings Conference On Design Manufacture Engineering And Its Application

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

Abstract

The potential of the sea in Indonesia is commonly used for the utilization of renewable energy from sea waves. One of the efforts to utilize energy, among others, is using a power plant by utilizing seawater wave power energy. So there is a need for ideas and design concepts about mechanical transmission of power plants powered by more effective seawater waves. This study aims to analyze the design of a cylindrical float type Marine Wave Power Plant (PLTG). This discussion focuses on variations in the height of a device, arm length, and buoy diameter. Where when the amplitude and frequency of water waves provide up and down movements of the cylindrical buoy. Then the torque will be generated from the main shaft which has a one way bearing which aims to rotate in the same direction, then forwarded to rotate the generator which will produce electrical energy. The largest power value is obtained in the variation of tool height (Y = 0.5 m), arm length (Pl = 3 meters), and diameter (ø = 0.4 m) which is 599.596 watts. Then the smallest power value in the variation of tool height (Y = 1.5 m), arm length (Pl = 2 m) and buoy diameter (ø = 0.6 m) which is 291.334 watts.
Investigating The Engine Propeller Matching Of Triple Screw Ro-Ro Passenger Ship Bagas Rahkmad Ramadhan; Syafiuddin; Agung Purwana
International Conference on Maritime Technology and Its Application Vol. 3 No. 1 (2025): ICOMTA : International Conference on Maritime Technology and Its Application
Publisher : Surabaya State Polytechnic of Shipbuilding

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35991/icomta.v1i1.4

Abstract

The conversion of a Ro-Ro Vehicle Carrier into a Ro-Ro Passenger Ship. in compliance with PERMEN RI Number PM 62 of 2019. necessitates the use of at least two main engines. This study evaluates the performance of the C5-75 and MAU4-65 propellers to assess their efficiency. At a speed of 21 knots. the C5-75 propeller achieves an efficiency (ŋ) of 0.66 in clean hull conditions and 0.655 in rough hull conditions. The MAU4-65 propeller shows an efficiency of 0.646 in clean hull conditions and 0.653 in rough hull conditions. The Engine Propeller Matching (EPM) only a 12640 kW main engine indicates optimal operation at 109 rpm (clean hull) and 112 rpm (rough hull). Added 2 auxiliary main engine 1040 kW engines operate at 1577 rpm (clean hull) and 1597 rpm (rough hull). These findings highlight the propeller's performance and the required engine settings to achieve the desired speed after conversion.
Co-Authors Abdul Gafur Bagas Rahkmad Ramadhan Burniadi Moballa Dhipta Rama Samodra Mohamad Eko Kurniawan Mohammad Hakam Muhammad Rafli Syahrizal R Syafiuddin