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All Journal Jurnal Ilmiah Teknologi dan Rekayasa ELKHA : Jurnal Teknik Elektro Jurnal Simetris Jurnal Teknologi Media Mesin: Majalah Teknik Mesin R.E.M (Rekyasa Energi Manufaktur) Jurnal Turbo : Jurnal Program Studi Teknik Mesin JTERA (Jurnal Teknologi Rekayasa) Angkasa: Jurnal Ilmiah Bidang Teknologi Bina Teknika JAIM (Jurnal Abdi Masyarakat) Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi International Journal of Marine Engineering Innovation and Research Indonesian Journal of Society Engagement (IJSE) Cakrawala: Jurnal Pengabdian Masyarakat Global ABDIKOM Jurnal Polimesin TEKNOSAINS: Jurnal Sains, Teknologi dan Informatika
Fitri Wahyuni
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Pembangunan Nasional Veteran Jakarta
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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Pengaruh slot kumparan pada kinerja permanent magnet synchronous motor dengan metode komputasi Ferdyanto; Idris Marbawi; James Julian; Fitri Wahyuni
TEKNOSAINS : Jurnal Sains, Teknologi dan Informatika Vol 10 No 1 (2023): TEKNOSAINS: Jurnal Sains, Teknologi dan Informatika
Publisher : LPPMPK- Universitas Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/tekno.v10i1.323

Abstract

Kesadaran mengenai isu-isu energi dan lingkungan, industri otomotif mulai mengembangkan kendaraan listrik. Banyak negara dan produsen mobil besar telah banyak berinvestasi dalam penelitian kendaraan listrik. Di industri ada persyaratan dinamika torsi maksimum dan respon torsi kondisi tunak yang lebih baik. Ada gelombang yang lebih rendah pada fluks magnet motor dan torsi yang dihasilkan. Permanent magnet synchornous motor (PMSM) menjadi salah satu pilihan yang tepat. PMSM menggunakan rare-earth magnets yang telah diterapkan sebagai traction motor untuk kendaraan listrik karena memiliki efisiensi yang tinggi dan kepadatan daya. Penelitian ini dilakukan untuk mengetahui tingkat efisiensi yang disajikan dari berbagai jenis motor sinkron dengan spesifikasi motor yang berbeda dari slot type of coil untuk mengetahui motor sinkron mana yang lebih efisien. Sehingga penelitian ini dapat membantu para pengguna motor sinkron dalam menentukan rancangan motor sinkron yang sesuai dengan kebutuhan. Penelitian berjalan dengan menggunakan proses komputasi pada software Ansys Electronic 2018. Seluruh proses komputasi yang dilakukan menggunakan metode Finite Element Analysis (FEA) untuk menyelesaikan permasalahan medan magnet dan medan listrik secara sederhana. Tipe motor dengan kode C1 memiliki nilai efisiensi tertinggi sebesar 95,251% berdasarkan rasio dari input power dan output power dengan spesifikasi besarnya nilai kuat medan magnet sebesar 0,93409 Tesla dan laju kuat arus persatuan panjang sebesar 5,3208 Ampere per meter, serta motor ini mendapatkan nilai efisiensi yang optimal pada kecepatan konstan motor sebesar 13300 rpm dan pada 75 derajat sudut putar rotor saat bekerja.
The effect of flap thickness on the hydrodynamic performance of an oscillating wave surge converter James Julian; Rasya Aulia Nathania Nisa; Fitri Wahyuni; Riki Hendra Purba; Fathin Muhammad Madhudhu; Elvi Armadani
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.7682

Abstract

With the growing demand for energy and the need to transition to renewable sources, ocean wave energy presents great potential. The Oscillating Wave Surge Converter (OWSC) is a promising technology due to its nearshore applicability, structural simplicity, and robust design. This study systematically investigates the effect of flap thickness on the dynamic performance of a hinge-mounted OWSC using the Boundary Element Method (BEM).   The research models the hydrodynamic interactions and analyzes the effects of three different flap thicknesses on key metrics, including maximum angle deviation, angular velocity, torque, and power capture. The results indicate that all flap variations demonstrate stable oscillatory movement, but greater flap thickness reduces the maximum angle deviation due to increased inertia and hydrostatic pressure. A resonant peak was observed for all thicknesses at a wave period of 1.3 seconds, where energy transfer was maximized. At this frequency, the thickest flap achieved the highest efficiency (78.94%), followed by the intermediate (77.50%) and thinnest (70.77%) variations. The findings suggest that while flap thickness influences efficiency, the primary factor for maximizing energy capture is the alignment of the wave period with the device's natural frequency.
Numerical investigation of heat reduction system in 42110 Lithium-Ion battery packs using cooling plate spacing variations Bima Rakha Adhitama; James Julian; Fitri Wahyuni; Fathin Muhammad Madhudhu; Elvi Armadani
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.7692

Abstract

An efficient thermal reduction system is crucial for ensuring the optimal performance and safety of Electric Vehicle (EV) batteries, notably by maintaining uniform temperature distribution and minimizing the risk of thermal runaway. This study presents a numerical investigation of the thermal behaviour of a liquid-cooled system for a cylindrical Li-ion 42110 battery pack, focusing on the influence of varying cold-plate spacing. Three cold plate configurations with spacing ratios r = 0.78, r = 0.33, and r = 0 were examined, with r = 0.78 corresponding to the most significant separation. The simulation employed a Reynolds-Averaged Navier–Stokes (RANS) model to resolve fluid flow and energy transport, and the heat-generation profile was derived from experimental data. The results show that all cooling configurations substantially reduced the maximum temperature relative to the uncooled case, with the widest spacing (r = 0.78) achieving the most significant average reduction of 19.736%. However, designs with smaller spacing exhibited slightly higher temperatures and reduced uniformity, particularly near the positive pole, where heat concentration is more pronounced. The temperature deviation remained within the acceptable 2% threshold. These findings highlight not only the thermal effectiveness of each spacing ratio but also its design implications, demonstrating that spacing plays a critical role in controlling peak temperature and maintaining uniformity. Overall, the study emphasizes that strategic cold-plate spacing is essential for reliable, efficient, and thermally stable battery operation in EV applications.
Investigation of the Influence of Plate Thickness on Orifice Flow Using the Computational Fluid Dynamics Method Mokhammad Bahtiar Rivai; James Julian; Fitri Wahyuni; Riki Hendra Purba
TURBO [Tulisan Riset Berbasis Online] Vol 14 No 2 (2025): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i2.4286

Abstract

Piping systems provide effective fluid distribution and are crucial to industrial operations. Despite their effectiveness, flow control devices like orifice plates can result in significant pressure drop that can lower system efficiency and wear out the system’s mechanical components. This study aims to optimize orifice plate design by examining the effect of plate thickness on flow characteristics using Computational Fluid Dynamics (CFD). Simulations were conducted on orifice plates with thicknesses ranging from 1.5T to 3.0T under Reynolds numbers from 10⁴ to 10⁶. Results show that increasing the thickness reduces pressure loss, with the 3T configuration achieving a 1.35% reduction compared to the baseline. Improvements are linked to a higher discharge coefficient (Cd), shorter flow reattachment distance (Xr), smaller recirculation zones, and reduced velocity through the orifice throat. These findings suggest that geometric modifications can enhance flow performance and reduce the risk of mechanical damage in piping systems.
THE EFFECT OF OFFSET RATIO ON OFFSET JET FLOW STRUCTURE Rifqi Ramadhani; James Julian; Fitri Wahyuni; Riki Hendra Purba; Fathin Muhammad Madhudhu; Elvi Armadani
TURBO [Tulisan Riset Berbasis Online] Vol 14 No 2 (2025): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i2.4538

Abstract

Jet flow is a crucial fluid dynamic phenomenon that has been extensively studied. It is essential for various industrial applications, including surface cleaning, flow control, and cooling electronic components.  Offset jet is an innovation in jet flow configuration that offers advantages in flow pattern control by expanding the impingement area and regulating surface pressure distribution. This study employed a Computational Fluid Dynamics (CFD) approach to investigate the influence of variations in the offset jet ratio on the aerodynamic characteristics of the flow, specifically the impingement zone area, pressure coefficient distribution, and skin friction coefficient. The standard k-ε turbulence model, utilizing a structured mesh and a Reynolds number of 10,000, was employed in this research. The number of mesh elements used was a fine mesh of 200,000 with an error percentage of 0.09436%. The results of the study show that an offset ratio of 3 produces the highest cf value of 0.0047 and a stable Cp distribution of 0.218, while also providing the best impingement zone area. These findings indicate that OR 3 is the most optimal configuration in terms of aerodynamics for precision system applications, with a focus on flow pattern control and wide impingement zone coverage.
Study of Aerodynamics Characteristics of Popular Sports Utility Vehicle in Indonesia James James Julian; Fitri Wahyuni; Rizki Aldi Anggara; Ridwan Daris Naufal
Simetris: Jurnal Teknik Mesin, Elektro dan Ilmu Komputer Vol. 16 No. 2 (2025): JURNAL SIMETRIS VOLUME 16 NO 2 TAHUN 2025
Publisher : Fakultas Teknik Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/simet.v16i2.10890

Abstract

The concept of aerodynamics is an essential aspect of designing a vehicle. In this study, the aerodynamic characteristics of the Sports Utility Vehicle (SUV) model are investigated using a numerical approach. This study uses three popular SUV models in Indonesia, including the Toyota Fortuner, Mitsubishi Pajero, and Hyundai Santa Fe. The three SUV models were tested at three different speed variations, including 20 km/h, 50 km/h, and 100 km/h. Based on the computational results, it was found that each SUV model produced a CD value that varied between 0.32 and 0.38. The highest CD value was obtained by the Toyota Fortuner, followed by two other vehicle models, including the Mitsubishi Pajero and Hyundai Santa Fe. The CD value obtained by each vehicle is dominated by drag pressure. This condition is indicated by the flow separation phenomenon, which causes a recirculation zone. In addition, the large frontal area causes an increase in stagnation pressure so that the pressure difference between the front and rear sides of the vehicle body causes significant drag. Based on the drag reduction percentage, the Hyundai Santa Fe Vehicle is the most aerodynamic vehicle model, with its ability to reduce drag by up to 6,604%. In addition, the Mitsubishi Pajero can reduce drag by up to 2,187%. On the other hand, the Toyota Fortuner cannot reduce drag because it has a CD value that is higher than the average CD value for SUV models.
Investigation of Bluff Body Shape Variation on Enhancing Heat Transfer Performance of Backward-Facing Step Flow Fitri Wahyuni; Rizki Aldi Anggara; James Julian; Riki Hendra Purba; Fathin Muhammad Mahdhudhu; Elvi Armadani; Nely Toding Bunga
Jurnal ASIIMETRIK Jurnal Ilmiah Rekayasa & Inovasi Volume 8 Number 2 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i2.10260

Abstract

The control of flow separation phenomenon is a challenge that has attracted much attention from researchers in the context of heat and mass transfer. This phenomenon negatively affects heat transfer performance in thermal management applications. Flow control devices play a crucial role in minimizing the effects of flow separation. One of the fundamental geometries that supports understanding in flow separation control is the backward-facing step. Therefore, this study aims to investigate the utilization of bluff body shape variations, including cube, cylinder, and diamond shapes, as passive flow control devices on heat transfer performance in backward-facing step flow. The present study used a Computational Fluid Dynamics solver, followed by a variation of the Reynolds number, 50 ≤ Re ≤ 400. Computational results show that the bluff body significantly reduces the primary recirculation zone and compresses the thermal boundary layer, strengthening the temperature gradient and improving the heat transfer rate. The cube variation demonstrates the optimal thermal performance, exhibiting an augmentation in the average Nusselt number of up to 28.15% at Re = 400, resulting the highest overall Performance Evaluation Criterion.
Co-Authors Adi Winarta, Adi Akhmad Nidhomuz Zaman Aldi Raditya Adriansyah Anggie Wijaya Topan Anton Dwi Prabowo Armansyah Armansyah Armansyah Armansyah, Armansyah Bima Rakha Adhitama Budhi Martana Bunga, Nely Toding Chandra Teguh Trimulya Christian Jovie Yudhananta Desta Sandya Prasvita Deva Ihsan Khoirunas Elvi Armadani Elvi Wijaya Armadani Fahrudin Ulwani Fahrudin, Fahrudin Faiz Daffa Ulhaq Fathin Muhammad Madhudhu Ferdyanto Hamzah, Muhammad Fakhri I Wayan Marlon Managi Idris Marbawi James James Julian James Julian James Julian Lomo Mula Tua Mahdhudhu, Fathin Muhammad Martana, Budhi Mirza Fauzan Lukiano Mokhammad Bahtiar Rivai Muhammad Fakhri Hamzah Muhammad Hanif Ulwani Noverdo Saputra Nur Cholis Raffi Indrajati Rainer Samuel Fourlando Rasya Aulia Nathania Nisa Reza Najmi Akmal Ridwan Daris Naufal Rifqi Ramadhani Riki Hendra Purba Rizki Aldi Anggara Saphira Anggraita Siswanto Tulus Hidayat Yusanto Ulwani, Muhammad Hanif Waridho Iskandar Waridho Iskandar Zackharia Rialmi