Dendy Satrio
@its.ac.id
Department of Ocean Engineering
Institut Teknologi Sepuluh Nopember
RESEARCH INTERESTS
Renewable Energy
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Dendy Satrio, Suntoyo, Hadian Bagas Widyawan, Maulana Akbar Ramadhani, and Maktum Muharja
Elsevier BV
Siti Musabikha, Gadang Priyotomo, Arini Nikitasari, Siska Prifiharni, Rahayu Kusumastuti, Dendy Satrio, and Sony Junianto
AIP Publishing
Daif Rahuna, Erwandi, Dendy Satrio, and I. Ketut Aria Pria Utama
EDP Sciences
Researchers have studied vertical axis turbines (VATs) for their low power efficiency, focusing on the turbine blades, selecting suitable airfoils, modifying the original airfoil shape, and adding other devices to the blades. The proposed method is to add a passive vortex generator device, which generates vortex flow to delay the separation flow at the surface, thereby increasing efficiency. Initially, VGs were used on aircraft wings to improve stability and performance efficiency; later, they were developed for other transport industries, such as cars, trucks, high-speed trains, and ships. In the renewable energy sector, VGs are used to improve turbine performance and efficiency. The research aims to obtain comprehensive information on the effect of using VG on vertical-axis ocean current turbines. To achieve this goal, we collected articles related to VG, reviewed the published articles on VG research on wind turbines and marine current turbines, then analysed the research results and determined the results based on the research methodology. At present, research has been developed to obtain the shape, dimension, and configuration of VG suitable for a vertical-axis ocean current turbine. The research is carried out in stages, which currently prioritize the shape and VG dimensions used in VAT with NACA 0021 blades, followed by the development of VG configuration research on VAT blades.
D Satrio, M A Anjelina, D M Rosyid, H Ikhwani, W N Fadilah, M A R Fauzi, and A Ridlwan
IOP Publishing
Abstract The LPG Refrigerated Green Terminal Project for Sustainable Development Goals seeks to enhance national stock resilience and reduce reliance on leased refrigerated LPG floating storage by a State-Owned Oil and Gas Company. Various challenges were encountered throughout the project, including resident demonstrations causing schedule disruptions, delays in project design due to client approval processes, and disparities in land data during tendering and implementation phases, among others. This research aims to identify the most critical risk by assessing the number of priority risks and risk categories. Effective risk management is pivotal in achieving project objectives. The methodology employed encompasses Fault Mode and Effect Analysis (FMEA), a 3D Risk Matrix, and a Pareto Diagram, supplemented by Analytical Hierarchy Process (AHP) software for risk weight determination. The study reveals a minimum Risk Priority Number (RPN) of 6, signifying low-risk severity, infrequent risk occurrence, and the company’s ability to detect these risks. Conversely, the highest RPN is recorded at 36, indicating significant risk severity, frequent risk occurrence, and challenges in risk detection by the company.
D Satrio, S Musabikha, S Junianto, S Prifiharni, R Kusumastuti, A Nikitasari, and G Priyotomo
IOP Publishing
Abstract A significant step in reducing the effects of greenhouse gases is obtaining electric energy from renewable sources. Electricity from tidal currents using underwater turbines is one of the most promising and well-liked technologies. The turbine systems are the key element in the tidal current energy. They are built using hydrodynamic principles to extract the most power possible from tidal ocean currents and are designed to last for extended periods in a maritime environment. The performance of tidal turbines is also significantly influenced by their materials, i.e., carbon fiber reinforced polymers (CFRP) used in them. This paper also reviews the CFRP materials used in tidal current turbine systems. Besides, an analysis of their advantages and challenges regarding CFRP materials that can impact tidal current turbine efficiency is further explored.
Badril Azhar, Setiyo Gunawan, Maktum Muharja, Cries Avian, Dendy Satrio, and Hakun W. Aparamarta
Elsevier BV
Maktum Muharja, Sofiatul Hasanah, Difka Augustina Diana Sari, M. Khoirunnafiuddin, Siska Nuri Fadilah, Rizki Fitria Darmayanti, Dendy Satrio, and Maya Ismayati
Elsevier BV
Rizki Fitria Darmayanti, Maktum Muharja, Arief Widjaja, Nurul Widiastuti, Rahadian Abdul Rachman, Alvin Rahmad Widyanto, Abdul Halim, Dendy Satrio, and Bambang Piluharto
Elsevier BV
Dendy Satrio, Anna Zulaiha, Lohdy Diana, Abdi Ismail, Fahmy Ardhiansyah, Maktum Muharja, Tuswan Tuswan, Aditya Rio Prabowo, Rendra Panca Anugraha, and Herman Pratikno
Praise Worthy Prize
M. H. Fakhri, D. Satrio, and Suntoyo
Institution of Engineering and Technology
Nur Fadhilah, Maktum Muharja, Doty Dewi Risanti, Ruri Agung Wahyuono, Dendy Satrio, Achri Isnan Khamil, and Siska Nuri Fadilah
Bulletin of Chemical Reaction Engineering and Catalysis
The presence of oxide layers covering the surface of aluminum is known to impede the hydrogen production reaction. These oxide layers can be broken by adding catalysts and increasing the aluminum-water reaction temperature. Common catalysts used are alkaline catalysts that are capable of achieving high hydrogen production rates in a short time at lower temperatures, while intermediate temperatures of above 50 °C can accelerate the hydration reaction of the oxide layer. Herein, the mixture of NaOH and NaAlO2 catalysts was employed to attain a stable NaAlO2 solution and continuous reaction of NaOH and aluminum. This research analyzes the influence of temperature between 32 and 80 °C on the aluminum, 0.3 M NaOH and 0.001 M NaAlO2 catalysts solution at atmospheric pressure. All solutions produces a similar hydrogen yields and rate. Solutions containing NaAlO2 indicate reverse reaction that surpressing the Al(OH)3 precipitation. Residue from the reaction is investigated using X-ray Diffraction (XRD), Fourier Transform Infra Red (FTIR), and Scanning Electron Microscope (SEM). The volume of hydrogen produced is evaluated using a mathematical mass reduction and shrinking core model. The rate of hydrogen production depends largely on the aqueous solution's temperature, with an activation energy of 47.4 kJ/mol. Based on the findings, it is readily apparent that the reaction only produced gibbsite and bayerite, with gibbsite and bayerite being dominant at 32–70 °C and 80 °C, respectively. The mass reduction model fits well with the present results with only an average 5.1 mL deviation, whereas the shrinking core model generally tends to result in underestimated values with an average deviation of 23.9 mL. Copyright © 2023 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Akhmadi Firman Sasmita, Nu Rhahida Arini, and Dendy Satrio
IEEE
Tidal current energy is a natural resource which can replace fossil energy. A vertical-axis tidal turbine is a device that can be used to extract tidal current energy. However, the influence of the vertical axis tidal turbine is not fully understood. Under the actual condition, the vertical axis tidal turbine produces a high torque fluctuation, making the turbine power coefficient low. This study aims to numerically analyze the performance of vertical axis tidal turbine straight blade (Darrieus type) and helical blade (Gorlov type) and the blade inclination angle effect to improve the power coefficient of vertical axis tidal turbines. 3D CFD models of vertical axis tidal turbines developed using OpenFOAM software—the blade profile using NACA 0012 with a given tip speed ratio (TSR) 2.2. The simulation result of a turbine with a straight blade and helical blades 55°, 65° is compared. The results show the advantages of the helical blade over the straight blade, including the significantly reduced torque fluctuations: where the TRF is reduced from 1.288 up to 0.6204. The power coefficient increases from 23% to 25%. Therefore, a vertical-axis tidal turbine with a helical blade has a smoother torque fluctuation and a better power coefficient. The uniqueness of this research is compared to previous studies where the turbine was analyzed at a flow rate corresponding to ocean in Indonesian with a flow velocity of 2 m/s. In this study, a variation of the angle of inclination of the blades was carried out on the Gorlov-type turbine so that it could determine the inclination angle Optimal blade for the Gorlov-type turbine.
Muhammad Asroril Mubarok, Nu Rhahida Arini, and Dendy Satrio
IEEE
Turbines installed in farming have slightly different characteristics. Mainly the problem is when several tidal turbines are placed side by side at the location of the tidal current flow. Therefore, is it necessary to predict energy at specific marine locations or to optimize the arrangement of turbines. The farm layout is precisely arranged to obtain the best position. One of the stages of optimizing turbines is the effective placement of turbine configuration using the Particle Swarm optimization (PSO) algorithm. This method is suitable for solving turbine positioning problems. This study aims to optimize position optimization to obtain the maximum power and minimum cost per power of the turbine using the PSO algorithm. The optimization of 2D position in three different scenarios has a substantial impact on the spacing between turbines and effects of objective function. The results of case 3 have a higher objective function value than cases 1 and 2, with an objective function value of 2.330 for five turbines and 1.415 for ten. The result shows turbine arrangement, the three cases show the influence of the current direction from various directions showing positions that are more spread out and pointing in identical directions but do not significantly affect the power generated. Speed has a significant effect on the power produced by the turbine. Variations in direction cause the position of the turbine to spread, while at an identical speed in one direction, the turbine’s position is directed in that direction. The PSO method can produce optimal solutions at a cost per product in complex environments with varying directions and speeds in actual circumstances.
Aninda Fajrria Puji Pangestu, Nu Rhahida Arini, and Dendy Satrio
IEEE
Savonius wind turbine is a type of vertical axis wind turbine (VAWT) which converts wind energy from all wind directions. Savonius turbines are appropriate to be applied to urban areas with low wind velocity. Other advantages of the Savonius turbine are the ability to operate in turbulence intensity and to self-start at low wind speeds. Wind conditions in urban areas reduce the performance of the Savonius wind turbine. This study aims to determine the effect of blade modification on the performance of the Savonius wind turbine by varying the overlap ratio (OR) applied in urban areas. This study uses Computational Fluid Dynamics (CFD) as a numerical method to model and simulate flow using OpenFOAM. The transient model simulation using pimpleFoam. The overlap ratio variations used are overlap ratio 0.0 and OR 0.15. The wind speed used for the simulation is 2.9 m/s and the simulation is for four turbine revolutions. Performance of Savonius turbines can be evaluated using coefficient of power, contour velocity, and contour pressure. The results show the coefficient of power value has increased by 30% at OR 0.15.
N Y Yahya, Silvianita, and D Satrio
IOP Publishing
Abstract Scope for of research publications on ocean current energy has increased, resulting in high innovation from ocean energy technology and available models for numerical equations in article publications. Reviews for mapping studies on the development of technology and numerical equations are still rarely carried out. This review refers to articles that use equipment used at sea and are based only on ocean currents for research. From a variety of results of the investigation, it can be expected to be used as material for further studies to find research materials that can be discussed collectively or need to be handled further. The objective of present review study is scanning condition of technology used for analysis and find out the types of numerical equations that are often used in papers in recent years. The result is that various areas of innovation have been investigated in current energy conversion technologies that increase performance and durability and reduce the impact on the environment and have summarised alternative numerical analysis commonly used for current energy conversion technologies.
W L Dhanistha, H Pratikno, S D P Maharani, Suntoyo, Silvianita, and D Satrio
IOP Publishing
Abstract A36 and A53 steels are low carbon steel with relatively similar carbon percentage, respectively 0,25-0,30% and 0,25-0,29%. Both steels are often used within the marine industry. The objective of this research is to figure out the effect of the variation of the groove angle and the heat input to the process of welding two different steel plates towards a metallography, tensile, and bending test with E71T electrode, as well as figuring out the groove angle and heat input to weld 18 mm thick steel plates. The variation of the groove angle used are 55°, 60°, and 70° with heat input variation of 140 and 180 A. Results of this experimental study shows that specimen with groove angle 70° and heat input 180 A with the largest sum of HAZ length, which is 8,4 mm, as well as the largest perlite phase, which are respectively, 67% within A36 base metal, 65% on A36 HAZ, 62% on weld metal,63% on A53 HAZ, and 66% on A53 base metal. The largest open defect value in bending tests is 1.87 mm owned by specimens with groove angle of 55° and heat input of 140 A.
H Ikhwani, M H M Putro, M Mustain, D Satrio, Sujantoko, Y S Hadiwidodo, and P H O Nasution
IOP Publishing
Abstract Indonesia has enormous potential in the maritime sector, specifically in the tourism sector. Tourism in Indonesia is developing in several regions. There is one of the tourism destinations in Gresik Regency, that is Dalegan Beach. Dalegan Beach is located in Dalegan Village, Panceng District which has an area of 6.39 km2. Dalegan Beach has an area of about 2.3 ha and a beach length of about 180 meters. Dalegan Beach has a potential eco-tourism because of sloping beach topography, calm waves and white sand. However, to develop the Dalegan Beach as an eco-tourism have several obstacles. There are lack of infrastructure to support tourist attractions, unclear collaboration between the village community and the local government, and poor management so that the development of eco-tourism is not optimal. This study aims to improve the management of Dalegan Beach as eco-tourism, which involved all stakeholders include local governments, communities, regional consultative bodies and universities. The Analythic Hierarchy Process (AHP) method is applied on this study in order obtaining an integrated and sustainable beach management formula based on priority scale. There are five factors used for the criteria in this analysis process, those are environmental, economic, social, infrastructure, and legal. Furthermore, the Expert Choice software are used to process inputs gained from the stake holders. The result of analysis indicates the order of alternative priority management that must be carried out namely human resource empowerment of 0.336 or (33.6%), then the development of tourist destinations with a value of 0.256 or (25.6%), further development of tourism marketing of 0.238 or (23.8%) and finally industrial development of 0.170 or (17.0%).
A Aulia, A G Athallah, M A Albasyir, S P Selvia, H A Darisman, and D Satrio
IOP Publishing
Abstract Recently, harnessing the energy from low wave energy density areas is concerned to deal with renewable energy targets. The previous study proposed a pitch point absorber with a submerged sectional equivalent area as the design parameter. However, that parameter did not suggest the best sectional area and did not directly correlate with the theory of structure hydrodynamic. Thus, this research proposes the diameter-to-draft ratio as a design parameter for the pitch point absorber. The study was conducted numerically using Boundary Element Method software to investigate diffraction characteristics of the device and analyze structure response in irregular waves. The model was modified with five different diameters and ratios. JONSWAP Spectrum was used to generate wave elevation with a 2-m significant wave height and 10-second peak period. The time domain simulation was set at 10.800 seconds. The result of this study showed that the highest responses occurred when the diameter-to-draft ratio was 5 because it has the closest structure natural frequency to assumed wave frequency, which makes it easier to resonate. In all diameters, the higher ratio affects the range of the structure natural frequency getting farther from the assumed wave, so the responses become smaller.
S Lestari, Mukhtasor, D Satrio, and S Rahmawati
IOP Publishing
Abstract The southern sea of Indonesia faces the open ocean i.e., the Indian Ocean. This provides an initial hypothesis that the location has a ti potential for wave energy throughout the year. The current due to the breaking wave is estimated to have a high velocity. This study focuses on analyzing the velocity of current oceanographic survey due to breaking waves with a case study in Pacitan bay, East Java, Indonesia. The oceanographic survey method uses ADCP and a Current Meter to capture wave and current data sampling with the purpose of the research was for the electrical energy generation near the coast. ADCP is used to record the occurrence of waves and ocean currents before the wave break. The Current Meter is used to record current occurrences after the wave breaks. The instantaneous absolute current velocity, ca, and return current velocity, U, reach a value of 2-3 m/s.
Dendy Satrio, Kevin Alief Adityaputra, Suntoyo Suntoyo, Silvianita Silvianita, Wimala Lalitya Dhanistha, Triyanda Gunawan, Maktum Muharja, and Frengki Mohamad Felayati
Praise Worthy Prize
Dendy Satrio, Suntoyo Suntoyo, Erwandi Erwandi, Fisko Albatinusa, Tuswan Tuswan, and Muhammad Luqman Hakim
Praise Worthy Prize
D Satrio, Suntoyo, F Albatinusa, S Junianto, S Musabikha, Madi, and F O Setyawan
IOP Publishing
Abstract Darrieus turbine has a vertical-axis configuration that is suitable for current from any direction. Placing a circular flow disturbance in front of the turbine can influence the performance. This study wants to investigate the positioning of the flow disturbance to find the best configuration. The study method used numerical simulation with Computational Fluid Dynamics (CFD) software. There are three variations of the cylinder position in front of the turbine with the angle of 0°, 60°, and -60°. As a result, the configuration can improve or disrupt the performance depending on the position installation. In position 0°, the performance was a decrease of 18%. The best performance is at the flow disturbance position of -60°. The maximum coefficient of power (Cp) value of the turbine was 0.19, with increasing of 27%. Therefore, it is recommended to use the position of -60° in front of the turbine.
Eko Sasmito Hadi, , Tuswan Tuswan, Ghina Azizah, Baharuddin Ali, Samuel Samuel, Muhammad Luqman Hakim, Muhammad Raaflie Caesar Putra Hadi, Muhammad Iqbal, Dian Purnama Sari,et al.
Faculty of Mechanical Engineering and Naval Architecture, Univ. of Zagreb
Investigation of hydrodynamic interaction between the vessel and the seabed when entering shallow water is considered one of the most critical considerations of inland waterway transport. There are many investigations into the behavior of ships in restricted waters, such as ships traveling in different forms of canal cross-sections. The present study aims to evaluate the hydrodynamic interaction of the 750 DWT Perintis Ship moving through the different canal types to determine the relative effects of limiting the width and depth cross section on the ship's resistance. Two different canals with different cross sections, including canal bank and rectangular canal, were evaluated to investigate the influence of canal width (Wb), depth ratio (hw/T), and blockage ratio function (As/Ac). The Computational Fluid Dynamic (CFD) method with Reynolds-averaged Navier–Stokes (RANS) solver and turbulent model 𝑘−𝜀 were used to predict the total resistance of the ship. The proposed numerical simulation was initially validated with an experimental towing tank test in the error range of 0.11-7.74%. The results indicated similar phenomena were found both in rectangular and canal banks. The case with a shallower (lower hw/T) and a narrower (lower Bc/Bs) canal dimension has a higher resistance value. Backflow and subsidence of free surface became significant around the ship's hull in more restricted water, changing the ship's hydrodynamic characteristics and increasing resistance. It can be found that the higher the blockage ratio (mb), the higher the total resistance value in both canal types, which proved that ships with higher speeds were more sensitive to changes in waterway restrictions.
Dendy Satrio, Firdaus Yusri Muhammad, Mukhtasor, Shade Rahmawati, Sony Junianto, and Siti Musabikha
Springer Science and Business Media LLC
A N Azizah, R Amalia, and D Satrio
IOP Publishing
Abstract One type of boiler is a boiler with tangential combustion. Tangential combustion is combusted with a burner arrangement located at each corner (corner) of the boiler, where each burner forms a certain angle to the boiler wall. Most of the tangential boilers are equipped with a tilting burner facility. An inclined burner is a facility to direct the burner to face up or down a certain angle to a horizontal line. Changes in the direction of the burner tilt angle will move to the fireball position in the furnace so that there can be changes in temperature, velocity, also species. This study was conducted to determine setting the burner tilt angle by varying the angle simulated using CFD. The data to be obtained are qualitative data in the form of contours and vectors from the distribution of temperature and velocity and quantitative data in graphs and tables. In this study, it is hoped that the ideal angle for the boiler will be obtained so that combustion in the boiler occurs efficiently.