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All Journal Jurnal Ilmiah Teknologi dan Rekayasa ELKHA : Jurnal Teknik Elektro Jurnal Teknologi Media Mesin: Majalah Teknik Mesin Turbo : Jurnal Program Studi Teknik Mesin Bina Teknika JAIM (Jurnal Abdi Masyarakat) Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi International Journal of Marine Engineering Innovation and Research Teknosains : Jurnal Sains, Teknologi dan Informatika Indonesian Journal of Society Engagement (IJSE) Cakrawala: Jurnal Pengabdian Masyarakat Global ABDIKOM Jurnal Polimesin
Fitri Wahyuni
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Pembangunan Nasional Veteran Jakarta
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Journal : Jurnal Polimesin

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Study of hydrodynamic characteristics in oscillating wave surge converter james julian; Rizki Aldi Anggara; Ridwan Daris Naufal; Rifqi Ramadhani; Eko Andi Prasetyo; Fitri Wahyuni; Nabilah Dwi Gunasti
Jurnal POLIMESIN Vol 22, No 2 (2024): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i2.4715

Abstract

In the realm of renewable energy, researchers worldwide have been paying close attention to developing the Oscillating Wave Surge Converter (OWSC) device. This device has the potential to harness the power of ocean waves and convert it into a reliable source of clean energy. Hydrodynamic characteristics are essential parameters in developing OWSC devices. Therefore, this research conducted a hydrodynamic study on the OWSC device with variations in ocean wave periods, including T= 1.5, 1.7, 1.9, 2.1, and 2.3. The Boundary Element Method (BEM) describes the interaction between sea waves and floating body structures. This method assumes incompressible, inviscid, and irrotational flow. A numerical approach is used as a calculation method followed by verification and validation to support the level of actualization. The research results showed that the incident wave caused the OWSC device to experience a deviation from its equilibrium position in the form of an oscillating flap inclination angle as a form of hydrodynamic characteristics. The sea wave period correlatedwith the rate of change in flap position over time, including the maximum deviation in the flap angle. As a power plant, the performance of the OWSC device can work at reasonably short-wave period intervals based on the device's ability to produce mechanical power. The highest average mechanical power was achieved in the T= 1.5 period of 34.49 Watts with an efficiency of up to 52.43%. The OWSC device requires a high intensity of wave energy in a short duration to generate optimal mechanical power. It is important to note that optimal mechanical power generation is crucial for the OWSC device to function effectively. Therefore, the device should be placed in a location where the wave energy intensity is consistently high.
Numerical Study On Characteristics Of The Backward-Facing Step Flow With Variations Of The Slope Angle Of The Step james julian; Rizki Aldi Anggara; Fitri Wahyuni
Jurnal POLIMESIN Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4052

Abstract

The phenomenon of flow separation plays a vital role in the industrial world. The backward-facing step (BFS) is a general form representing flow separation. This study investigates the influence of the slope angle of the step on BFS flow characteristics at various low Reynolds numbers. According to the CFD results, the flow separation phenomenon forms a circulation zone for each increase in Reynolds numbers. This phenomenon is a result of the sudden expansion of the channel geometry. The BFS with the slope angle of the step demonstrates that the increase in the recirculation zone can be minimized, thus appropriately delaying flow separation. The recirculation zone causes fluid flow to reverse direction, affecting fluid flow efficiency due to resulting pressure differences. Therefore, a BFS with the slope angle of the step exhibits a more efficient flow phenomenon by minimizing the recirculation zone.
Co-Authors Adi Winarta, Adi Akhmad Nidhomuz Zaman Armansyah Armansyah Armansyah Armansyah Budhi Martana Bunga, Nely Toding Chandra Teguh Trimulya Desta Sandya Prasvita Eko Andi Prasetyo Fahrudin Fahrudin Faiz Daffa Ulhaq Ferdyanto I Wayan M. Managi Marlon Managi Idris Marbawi James Julian Lomo Mula Tua Mirza Fauzan Lukiano Muhammad Fakhri Hamzah Nabilah Dwi Gunasti Noverdo Saputra Nur Cholis Ridwan Daris Naufal Rifqi Ramadhani Rizki Aldi Anggara Saphira Anggraita Siswanto Tulus Hidayat Yusanto Waridho Iskandar Zackharia Rialmi