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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) FLYWHEEL : Jurnal Teknik Mesin Untirta REKAYASA Communications in Science and Technology JMM (Jurnal Masyarakat Mandiri) Mekanika: Majalah Ilmiah Mekanika Indonesian Journal of Electrical Engineering and Computer Science SEMAR Journal of Electrical, Electronic, Information, and Communication Technology (JEEICT) Automotive Experiences Sinergi Polmed : Jurnal Ilmiah Teknik Mesin Research in Education, Technology, and Multiculture
Danardono Dwi Prija Tjahjana, Dominicus
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Sebelas Maret, 57126, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation Other

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Effect of Hole Geometry Shape in Vortex Generators on Fluid Output Temperature: Computational Fluids Dynamics Validation Mohd Afzanizam Mohd Rosli; Singgih Dwi Prasetyo; Dominicus Danardono Dwi Prija Tjahjana; Alfian Fahrul Yuliansyah; Zainal Arifin
Mekanika: Majalah Ilmiah Mekanika Vol 22, No 2 (2023): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v22i2.71340

Abstract

Several methods to enhance heat transfer can be classified into three categories: active, passive, or hybrid. Among these methods, Vortex Generators (VGs) are one passive heat transfer enhancement device widely used in heat exchangers. This study aims to explore the geometric shapes of VGs equipped with longitudinal holes and examine their influence on the outlet temperature of the fluid. For the analysis in this research, a three-dimensional Computational Fluid Dynamics (CFD) simulation using ANSYS Fluent software was employed. The increased heat transfer and flow resistance in the VG geometry were evaluated based on previous research for validation. The study results demonstrate that the simulation produces fluid outlet temperature values and velocity contours that closely resemble the results obtained from the reference study. The validation error of this research was found to be only 0.02%, indicating high quality and accurate simulation results. Furthermore, the study compared various geometries of the VG holes in the system. Among these geometries, hexagonal-shaped VG holes exhibited high-velocity contours on the VG side while achieving the lowest fluid outlet temperature at approximately 303.53 K. The findings of this study serve as a basis for further developments in enhancing the efficiency and performance of heat exchangers using VGs.
Performance Analysis and Characterization Hybrid Two Wheeller Vehicle with Using a Chassis Dynamometer Julian Fikri Arifwardana; Dominicus Danardono Dwi Prija Tjahjana; Muhammad Nizam; Ihsan Pratama Rushadiawan; Mufti Reza Aulia Putra
Journal of Electrical, Electronic, Information, and Communication Technology Vol 6, No 2 (2024): JOURNAL OF ELECTRICAL, ELECTRONIC, INFORMATION, AND COMMUNICATION TECHNOLOGY
Publisher : Universitas Sebelas Maret (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jeeict.6.2.92487

Abstract

The extraordinary growth in means of transportation, especially vehicles with internal combustion engines, has made state laws and regulations increasingly stringent. Regulations regarding energy consumption used for passenger and personal mobility and the emissions produced in order to reduce pollution. A hybrid vehicle combines two energies produced from various sources such as an ICE and an electric motor to become a hybrid electric vehicle (HEV). This research discusses hybrid electric vehicles on 2-wheeled vehicles which can be used as a solution that can be developed further before pure electric vehicles (EV) replace motorized vehicles (ICE). This research was done experimentally, by carrying out tests on a dynamometer and on the road testing. The main material used in this research was a Honda PCX 150 vehicle. The results of the test on the dynamometer showed that the performance of the internal combustion engine (ICE) had a torque of 11.12 Nm and a power of 8.20 kW at 7000 rpm. Testing the electric motor (EV), obtained torque results of 11.7 Nm and 2.33 kW power. The road test results for internal combustion engine consumption to consume 1 liter of fuel, capable of covering a distance of 54.55 km. Electricity consumption from 100% to 0% SOC can cover a distance of 46.31 km. Hybrid consumption 1 liter of fuel and battery full 100% capable of covering a distance 57.79 km, with battery condition reduced 16%.
Experimental Study of Lithium-ion Battery Performance Based on Mini-channel Cooling Plate Ihsan Pratama Rushadiawan; Dominicus Danardono Dwi Prija Tjahjana; Muhammad Nizam; Julian Fikri Arifwardana; Mufti Reza Aulia Putra
Journal of Electrical, Electronic, Information, and Communication Technology Vol 6, No 2 (2024): JOURNAL OF ELECTRICAL, ELECTRONIC, INFORMATION, AND COMMUNICATION TECHNOLOGY
Publisher : Universitas Sebelas Maret (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jeeict.6.2.92488

Abstract

Making efficient batteries is important nowadays. One potential problem that can hinder this is the thermal runaway that occurs in battery cells. There are various causes of thermal runaway, one of the most common is an increase in temperature that exceeds the optimal allowable limit. Additional cooling will be required in vehicles that use batteries. Battery Thermal Management System (BTMS) with mini-channel cooling plate is one of the methods often used to maintain battery performance. In this study, the performance of Lithium-ion batteries is affected by fluid flow velocity. The experimental process was carried out by charging and discharging with a C-rate of 1C. Cooling is done with ethylene glycol fluid with fluid velocity variations of 0.21 L/min; 0.42 L/min and 0.63 L/min. The results show that fluid flow velocity affects the final battery temperature and battery performance. The optimal fluid velocity is shown at 4.2 L/min. At this speed it can reduce the battery temperature by 6.7°C.
Steady RANS Assessment of Stall Fence Effects on Wells Turbine Performance for Oscillating Water Column Systems Muhammad Nurfajriansyah Muslich; Aditya Rio Prabowo; Ristiyanto Adiputra; Seung Jun Baek; Svitlana Onyshchenko; Mahfud Alfajar; Dominicus Danardono Dwi Prija Tjahjana; Iwan Istanto; Rahman Wijaya; Hermes Carvalho
Research in Education, Technology, and Multiculture Vol 5, No 3 (2026): Research in Education, Technology, and Multiculture
Publisher : Institute of Multidisciplinary Research and Community Service

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61436/rietm/v5i3.pp222-238

Abstract

The Wells turbine is a key component in an Oscillating Water Column (OWC)-based ocean wave energy conversion system, yet its limited operating range due to leading-edge stall constrains overall system efficiency. This study presents an independent CFD benchmark of the performance of the Wells turbine with and without a passive flow control device, a stall fence, as investigated by Das and Samad (2020). Steady Reynolds-Averaged Navier-Stokes (RANS) simulations using the SST k-ω turbulence model were performed in ANSYS CFX v22.1 by replicating the original geometry, boundary conditions, and mesh density for direct comparison. The reference turbine (eight NACA 0015 blades, solidity 0.64) and the configuration with a stall fence (fences at 40% and 80% span) were evaluated over a flow coefficient range of φ = 0.075-0.275. Grid independence study using quantitative (non-dimensional torque T*) and qualitative (tip-vortex topology) criteria resulted in the selection of a 3.5-million-element mesh. For the reference turbine, a mean absolute percentage error (MAPE) of 2.0% for T* and 3.1% for efficiency was obtained in the pre-stall range (φ ≤ 0.225), confirming strong numerical reproducibility. However, steady RANS failed to predict the stall onset for the reference configurations and overpredicted torque by up to 508% in the post-stall region. The stall point at φ = 0.250 was successfully reproduced with a deviation approaching zero, proving that the vorticity induced by the fence geometry enhances the reliability of RANS stall predictions. The pre-stall MAPE for the fence configuration was 4.4% for T*, slightly higher due to local vortex interactions around the fence. These findings establish steady RANS as a reliable design tool in the pre-stall range and demonstrate that passive fence stalls not only extend the turbine’s operating range but also improve the accuracy of CFD predictions. Keywords: Wells turbine, Stall fence, CFD benchmark, Steady RANS, Ocean wave energy conversion.
Co-Authors Achmad Gustiantono Aditya Rio Prabowo Ahmad Ilham Ramadhani Andriyanto, Solikin Arinal Falah Muhammad Bhre Wangsa Lenggana Budiana, Eko Prasetya Chico Hermanu B.A. Endra Dwi Purnomo Faishal Harish Hidayatullah Haji, Mohammed M. Harwijayanti, Widyanita Hermes Carvalho Ihsan Pratama Rushadiawan Ilham Bagus Wiranto Inayati Inayati Iwan Istanto Julian Fikri Arifwardana Mahfud Alfajar Mohd Afzanizam Mohd Rosli Mohd Afzanizam Mohd Rosli Mufti Reza Aulia Putra Muhammad Aziz Muhammad Nizam Muhammad Nurfajriansyah Muslich Muhammad Sidik Teja Purnama Ngafwan Ngafwan Rachmanto, Rendy Adhi Rahman Wijaya Rendy Adhi Rachmanto Risdiyanto, Gunawan Ristiyanto Adiputra Septiyanto, Muhamad Dwi Seung Jun Baek Shame, Buruhan Haji Singgih Dwi Prasetyo Suyitno - Suyitno Suyitno Suyitno Suyitno Suyitno Suyitno Suyitno Suyitno Svitlana Onyshchenko Syamsul Hadi Syamsul Hadi Syamsul Hadi Trismawati Trismawati Ubaidillah Ubaidillah Ubaidillah Ubaidillah Ubaidillah Wibawa Endra Juwana, Wibawa Endra Yudin Joko Prasojo Zainal Arifin Zainal Arifin Zainal Arifin Zainal Arifin