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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) Jurnal Teknik Mesin Indonesia 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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The renewable energy research contribution of Tanzania: A review Shame, Buruhan Haji; Ubaidillah; Tjahjana, Dominicus Danardono Dwi Prija; Arifin, Zainal; Aziz, Muhammad; Harwijayanti, Widyanita; Haji, Mohammed M.
Communications in Science and Technology Vol 9 No 1 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.1.2024.1348

Abstract

The central objectives of this study are to locate existing research on renewable energy, examine the energy policy of Tanzania, assess bibliometric factors, determine the direction of the current research, and comprehend unexplored research topics. This exploration focuses on a bibliometric-based study using computer-assisted software tools known as VOS viewer and RStudio in analyzing the Scopus data retrieved package for the key phrase of "Renewable energy" in the article titles published from 2002 to 2022. A total of 661 publications (which is only 0.45% and 6.3% of the global and continental publications from Africa respectively) were analysed after refining using different bibliometric criteria like study site, type of document, publication stage, language used in the document, and publication time interval. The results shows that Energy fuels, engineering, technology, environmental sciences, ecology, and business economics are the most frequently studied fields. Also, from a total of 661 publications, only 32 documents were published from Tanzania for 20 years from 2022 which is less than 2 publication/year. This study concludes that there is a notable lack of research output from Tanzania in this critical field. This gap underscores the need for greater investment in renewable energy research and development within the country, as well as targeted efforts to build research capacity and foster collaboration among academia, government, and industry stakeholders.
Experimental Comparison of Double-Stage Runner Profiles in Gravitational Water Vortex Turbines for Improved Performance Risdiyanto, Gunawan; Septiyanto, Muhamad Dwi; Hadi, Syamsul; Tjahjana, Dominicus Danardono Dwi Prija; Budiana, Eko Prasetya; Andriyanto, Solikin
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.30683

Abstract

Gravity Water Vortex Turbines (GWVTs) are a new category of turbines used in micro-hydro power plants (MHPs). GWVTs can be used to optimize existing water flow potential, aerate water bodies, and maintain ecosystem integrity. The basic idea for this development stems from previous research showing that GWVTs with conical basins exhibit different flow velocity distributions at different locations. To exploit this potential, experimental analysis was conducted using a two-stage configuration with varying runner profiles and different flow rate conditions. A low-speed water tunnel with a conical basin was used to generate the vortex flow. Furthermore, the performance of the double-stage GWVT was compared with that of a single-runner GWVT in terms of power conversion. The study used several turbine configurations profiles, including Savonius and Flat with Curved. The findings measured torque, mechanical power conversion, and rotational speed. The GWVT performance results were evaluated using comparison-staging and inter-staging methods to determine the best performance of each turbine in generating power. The results showed that the Savonius blade profile on a single-runner GWVT installed in the lower stage position was superior in terms of power conversion. The best power generated is 53.7 Watts, and the efficiency is 52.3% at a flow rate of 9.1 L/s. The installation of two similar runners on a double-stage GWVT yields better power conversion than the installation of two different runners. A flat with Curved runners installed for the lower and upper stages on a double-stage GWVT shows the highest results of 56.7 Watts and 1.2 Watts. So, it can be concluded that the power conversion of a double-stage GWVT is superior to that of a single-runner GWVT.
PENERAPAN TEKNOLOGI BIOPORI UNTUK MENINGKATKAN KETERSEDIAN AIR TANAH SERTA MENGURANGI SAMPAH ORGANIK DI DESA PURON SUKOHARJO Arifin, Zainal; Tjahjana, Dominicus Danardono Dwi Prija; Rachmanto, Rendy Adhi; Suyitno, Suyitno; Prasetyo, Singgih Dwi; Hadi, Syamsul
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 9, No 2 (2020): November
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v9i2.43408

Abstract

Ketersediaan air tanah di Desa Puron Kecamatan Bulu Kabupaten Sukoharjo semakin menurun. Hal itu dikarenakan pengambilan air tanah yang tidak diimbangi dengan semangat konservasi dan sedikitnya air hujan yang masuk ke dalam tanah. Berkurangnya jumlah air yang ada mengakibatkan mengeringnya tumbuhan di lingkungan tersebut. Selain itu, masih banyaknya sampah rumah tangga menjadi permasalahan yang harus dihadapi masyarakat permukiman. Penanganan sampah dan irigasi secara konvensional yang telah diterapkan oleh masyarakat belum menjadi solusi terbaik. Sehingga perlu penanganan secara tersistematis, terstruktur dan berkelanjutan. Pengabdian yang dilakukan bertujuan untuk membantu masyarakat Desa Puron dalam menangani masalah air dan sampah. Pengabdian masyarakat dengan mensosialisasikan dan mengajak masyarakat untuk melakukan konservasi sumber daya air dengan penerapan teknologi sederhana dan murah. Penerapan teknologi yang bisa diterapkan yaitu dengan pembuatan lubang resapan biopori untuk meningkatkan jumlah air dalam tanah serta mengurangi sampah organik di Desa Puron. Lubang resapan biopori berfungsi sebagai tempat resapan air ke dalam tanah dan sebagai tempat pembuatan kompos dari sampah organik. Lubang resapan biopori tidak membutuhkan area luas dan proses pembuatannya sangat mudah, hal ini tentu menjadi solusi yang tepat untuk wilayah Desa Puron. Hasil pengabdian menjadikan ketersedian air yang ditandai dengan menghijaunya tumbuhan. Kata kunci: Air, Biopori, Pengabdian, Desa Puron
UJI EKSPERIMENTAL TORSI DAN DAYA MOTOR BLDC 48 V BERBASIS BATTERY PACK LiFePO₄ MENGGUNAKAN METODE PRONY BRAKE Ahmad Ilham Ramadhani; Dominicus Danardono Dwi Prija Tjahjana; Ngafwan Ngafwan
SINERGI POLMED: Jurnal Ilmiah Teknik Mesin Vol. 7 No. 2 (2026): Edisi Juni
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/sinergipolmed.v7i2.3228

Abstract

Nilai torsi dan daya menjadi faktor utama dalam menentukan karakteristik sistem penggerak Brushless Direct Current (BLDC) motor dengan suplai energi listrik dari baterai ion lithium (LiB). Tujuan penelitian ini adalah untuk menentukan torsi dan daya motor BLDC 48 V yang suplai oleh baterai lithium iron phosphate (LiFePO₄/LFP) menggunakan metode prony brake. Metode prony brake dilakukan dengan variasi beban W1 s.d. W5 dan variasi 200, 400, 600, 800, dan 1000 rpm. Pengujian eksperimental dirangkai menggunakan motor BLDC  dan LiB baterai pack LFP. Hasil eksperimen menunjukkan bahwa baterai pack yang digunakan berjenis LFP dengan kode rangkaian “15S12P”. Baterai pack LFP memiliki rentang tegangan 44,19 V - 55 V (charging) dan rentang tegangan 35,12 V - 53,12 V (discharging). Nilai torsi dan daya mengalami peningkatan seiring dengan penambahan rpm pada setiap variasi beban. Pada rentang operasi ini, sistem menunjukkan perubahan torsi dan daya yang lebih stabil. Nilai torsi tertinggi pada 1000 rpm (0,50 Nm; 0,55 Nm; 0,60 Nm; 0,63 Nm; 1,12 Nm) dan daya pada 1000 rpm (43,68 W; 46,77 W; 49,14 W; 50,68 W; dan 87,97 W). Informasi mengenai nilai torsi dan daya motor BLDC yang disuplai oleh baterai LFP, dapat menjadi salah satu acuan utama dalam mendukung pengembangan kendaraan rendah emisi.
Effect of Turbine Blades Transformation on Savonius Turbine Performance Muhammad Iyas Abdul Alim; Syamsul Hadi; Dominicus Danardono Dwi Priha Tjahjana
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 1 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i1.48619

Abstract

This study aimed to determine the effect of the transformation of Savonius turbine blades based on the Coefficient of Performance (Cp)-Tip Speed Ratio (TSR) curve. The transformation referred to here is the change in the blade angle so that the area of the cross-section of the returning blade is changed. Therefore, the opposing torque of the turbine obtained from the airflow is reduced. The specimen has three variations, without transformation or conventional turbine, the transformation of 5°, and transformation of 10°. With the reduction in the cross-sectional area of the returning turbine blade, it is expected that the turbine performance will increase. Experiments were carried out using wind tunnels with load variations at an air speed of 5, 6, and 7 m/s. The experimental result shows that the blade transformation movement causes a shift in the center of mass, increasing the turbine vibration that directly affects turbine performance. The negative effect from the vibration is greater than the positive effect caused by reducing negative torque. The experimental results show that conventional turbines have better performance than turbines with 5° and 10° blade transformations.
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.
CFD Modeling of Narasena Bengawan UV Team Quickster UAV Wings with Addition of Vortex Generator to Aerodynamic Performance Mohammad Fahmi Luthfi; Dominicus Danardono; Eko Prasetya Budiana; Yudi Kurniawan
Mekanika: Majalah Ilmiah Mekanika Vol 20, No 2 (2021): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v20i2.50736

Abstract

This research is based on obtaining the best possible aerodynamic performance for the Quickster Narasena Bengawan UV Team Unmanned Aerial Vehicle (UAV) aircraft wing design. One factor that significantly affects the flying version of a UAV is the wing. The Quickster Narasena UAV aircraft wing uses an MH33 airfoil because MH33 is specifically for high-speed UAV aircraft. This research will compare the performance of a branch without a vortex generator with addition with a vortex generator. This study will also discuss variations in the positioning of the vortex generator on the wing of the Quickster Narasena UAV. The method used in this research is the Computational Fluid Dynamics (CFD) method. The simulation process will use the ANSYS Fluent 19.0 application with the K-Omega Shear Stress Transform (SST) method with the Reynolds-Averaged-Navier-Stokes (RANS) equation as the basis. This study aims to obtain the results of the coefficient of drag, lift, and the contour of the turbulence that will occur. The simulation results that have been done are the geometry of the wing with the addition of a vortex generator can reduce the drag coefficient and can increase the lift coefficient.
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 Arjuna AJi Bambang Kusharjanta Bhre Wangsa Lenggana Budi Kristiawan Budi Santoso Budi Santoso Budiana, Eko Prasetya Chico Hermanu B.A. Eko Prasetya Budiana Endra Dwi Purnomo Faishal Harish Hidayatullah Gesa Sukmawan Haji, Mohammed M. Harwijayanti, Widyanita Hasnul Khuluqi Hermes Carvalho Ihsan Pratama Rushadiawan Ilham Bagus Wiranto Inayati Inayati Iwan Istanto Julian Fikri Arifwardana Mahfud Alfajar Mohammad Fahmi Luthfi Mohd Afzanizam Mohd Rosli Mohd Afzanizam Mohd Rosli Mufti Reza Aulia Putra Muh. Alwan Rosyidi Muhammad Aziz Muhammad Ivan Fadhil Hendrawan Muhammad Iyas Abdul Alim Muhammad Nizam Muhammad Nurfajriansyah Muslich Muhammad Sidik Teja Purnama Naufal Ikhsan Alfajri Ngafwan Ngafwan Rachmanto, Rendy Adhi Rahmad Rizki Nur Arifin Rahman Wijaya Rendy Adhi Rachmanto Risdiyanto, Gunawan Ristiyanto Adiputra Rumi Iqbal Doewes, Rumi Iqbal Satria Auliansyah 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 Syamsul Hadi Syamsul Hadi Trismawati Trismawati Ubaidillah Ubaidillah Wibawa Endra Juwana, Wibawa Endra Yudi Kurniawan Yudin Joko Prasojo Zainal Arifin Zainal Arifin Zainal Arifin Zulfikar Mahmud