Roslynna Rosli
@utb.edu.bn
Assistant Professor, Faculty of Engineering
Universiti Teknologi Brunei
RESEARCH INTERESTS
renewable energy, tidal energy, tidal turbine, generation, hydrodynamics, climate change action
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Nur Amal Fadhilah, Mohammad Nurul Islam, and Roslynna Rosli
Elsevier BV
Ahmad Farid Dato Hj Ali, Roslynna Rosli, and Mohammad Ali Basunia
AIP Publishing
Ahmad Farid Dato Hj Ali, Roslynna Rosli, and Mohammad Ali Basunia
AIP Publishing
Nur Amal Fadhilah, Mohammad Nurul Islam, and Roslynna Rosli
AIP Publishing
Nurul Hasan, Nawaf Saeid, Roslynna Rosli, and Md Mizanur Rahman
AIP Publishing
Abstract. Current Resource Assessment plays a major part in Tidal Energy Resource Assessment. The paper looks at analysing the total current data collected from BSP at Fairley Oilfield from 1st January 2019 up to 31 December 2019. The total current data and its direction was measured using ADCP, and is placed at an area with a depth of about 60m. The data is categorized into 3 depths; current speed and direction for overall depth, current speed and direction for top half of the sea, current speed and direction for bottom half of the sea. According to the current speed for the overall depth, the current speed was recorded to have an average speed of 0.27m/s and a maximum speed of 1.4m/s. For the current speed and direction at the top half of the sea, the current speed was recorded to have an average speed of 0.33m/s and a maximum speed of 2.24m/s. Finally, for current speeds at the bottom part of the sea, the current speed has an average of 0.22m/s and a maximum speed of 1.66m/s. The direction for all three categorizes were consistent in which the flow is recorded to be coming in from the East-North East to East, majority of the time.
Abstract. Tidal energy is the sole renewable energy associated with tidal movements due to the gravitational and centrifugal forces between the Earth, the Moon, and the Sun. Although tidal energy is not yet widely used, it has the potential to generate energy for the future. It is a clean, renewable energy source and more predictable than other renewable sources of energy. Various existing tidal turbines have been developed in Europe, where tidal velocity is much higher than the tidal velocity in Brunei Darussalam, which is around 0.5 m/s. Therefore, this study investigates the design of a tidal turbine that can be effectively implemented in Brunei Darussalam. There are five conceptual designs, and each of them was evaluated with the evaluation matrix with a three-bladed commercial Horizontal Axis Tidal Turbine as the datum, obtaining the final design, which is Design 1, has the highest scoring point.
Steve Ankuo Chien, Minh N. Do, Alan Fern and Wheeler Ruml
IOP Publishing
Proceedings of the Global Sustainability Conference GSC 2022 We are honored and glad to welcome you at the Global Sustainability Conference 2022 organized by Advanced Computing Research Society on 18-19 April, 2022. The Conference was hosted at the Seminar hall of Bonfils Automation Technologies Pvt. Ltd., Chennai. Due to the ongoing pandemic situation, authors were given the opportunity to present both in online and offline mode. This conference and these proceedings are a unique opportunity for sharing ideas and achievements, discoveries and innovation for growing together our knowledge and contribute to expand the knowledge of humanity. The technological areas addressed in this meeting is in response to United Nations call of action to end poverty, protect the planet and ensure that all people enjoy peace and prosperity by 2030. The conference covers topics on the interdisciplinary areas of agriculture and food security, biodiversity conservation, circular economy, cities and urbanisation, climate change in holistic context, development, economy, ecosystem services, ecological protection, education, energy, environmental development, environmental law, finance, gender equality, green infrastructure, health and environment, human population, industrialization, innovation, land cover and land use change, natural capital, natural resources conservation and management, pollution, poverty, social and cultural, supply chain, waste, water–energy–food and water-soil-waste connections and others, all as related to sustainability. We received 36 papers and after peer review 13 papers were accepted and presented in this conference. The papers were evaluated on the basis of completeness, relevance to the conference, originality, sufficiently novel, technical quality, structure and presentation of the paper and adequate references to previous work. Every paper was reviewed by at least 3 reviewers and the review comments were shared with the authors for incorporating the suggestions and comments. List of Editors of the Proceedings, Committees are available in this pdf.
Syazana Abdullah Lim, Afiqah Nabihah Ahmad, Roslynna Rosli, and Siti Noorfatimah Safar
Elsevier
R. Rosli, W. Shi, B. Aktas, R. Norman, and M. Atlar
Ocean Engineering Elsevier BV
Abstract The development of marine current turbines has progressed rapidly with prototypes and full scale devices being deployed in sea. With research focusing on the hydrodynamic and design aspects of the technologies used, little is known of the impact of marine current turbine operation on marine life and environment. This paper looks at the underwater radiated noise (URN) produced from the operation of a novel tidal turbine, the Hydro-Spinna. URN measurements were taken from a 280 mm diameter model tested in Newcastle University. The model results were extrapolated to predict the full scale URN level for three turbine diameters of 5 m, 10 m and 15 m and compared to the fish reaction level acoustic level provided by the International Council for the Exploration of the Sea (ICES) as a reference. Analysis showed an increase in noise level with turbine diameters and that for all diameters, the highest noise levels were observed at Tip Speed Ratio = 1 where the thrust on the turbine is at its maximum. The noise levels predicted for the Hydro-Spinna at this off-design condition is above the ICES threshold, it was found that at optimal operating conditions the noise level would be below the threshold.
Nur A. Fadhilah, Muhammad N. Islam, and Roslynna Rosli
International Journal of Mechanical Engineering and Robotics Research EJournal Publishing
Roslynna Rosli, Rosemary Norman, and Mehmet Atlar
IOP Conference Series: Materials Science and Engineering IOP Publishing
Nawaf H. Saeid and Roslynna Rosli
IOP Publishing
Roslynna Rosli, Weichao Shi, Batuhan Aktas, Rose Norman, and Mehmet Atlar
Engineering and Technology Publishing
Over the past decade, the development of marine current turbines has progressed rapidly with prototypes and fullscale devices being deployed in the actual environment. With research focusing on the hydrodynamic and design aspects of the technologies used, little is known of the impact of marine current turbine operation on marine life and the environment. This paper looks at the Underwater Radiated Noise (URN) produced from the operation of the Hydro-Spinna turbine which is a horizontal-axis type concept design under development at Newcastle University. URN measurements were taken from a 280 mm diameter Hydro-Spinna model. The URN measurement was part of a comprehensive investigation conducted on the turbine model, where the local pressure in the tunnel was reduced to induce cavitation to study its characteristics. The noise data was found to correspond to the cavitation observation where the noise increases as more cavitation developed. In addition, only tip vortex cavitation was observed during the investigation indicating that this is the only cavitation characteristic of the Hydro-Spinna turbine. As more tip vortex cavitation was observed, the URN results exhibit an apparent trend, whereby the sound pressure level (SPL) increased and the frequency shifted towards the lower frequency region.
Roslynna Rosli and Eric Dimla
IEEE
Renewable energy resources is one of the alternative energy source identified to address the issue of climate change, energy security and economic growth. Tidal energy is a predictable and reliable source of energy where the exploitable capacity is potentially huge, dispersed in different locations globally. The focus of extracting energy from tides has shifted from the traditional tidal barrages to tidal current energy converters. This paper looks into the different aspects that could be considered for tidal current turbines deployment focusing on site specific matters. Identifying the tidal velocity and mean kinetic energy flux is one of the first aspects of resource assessment when identifying a potential site. This ensures that any device deployed would be able to operate optimally. Different installation schemes are considered where currently, seabed installation is the preferred method. Another factor that needs to be considered is the distance of the tidal power plant from shore where the more remote the location the more power transmission cables needed. This reflects on the costs incurred where therefore a balance between the technical and site optimization has to be the most economical as well.
R. Rosli, R. Norman, and M. Atlar
Elsevier BV
A unique tidal turbine, “Hydro-Spinna”, is introduced. The Hydro-Spinna consists of three cardioidal blades spiralling around a common horizontal shaft. A 500 mm diameter model was manufactured and its performance investigated in the towing tank facility of Newcastle University. The main objective of these experiments was to investigate the hydrodynamic efficiency of Hydro-Spinna with a view to improve the design by collecting data for use in numerical optimization. Considering its flexible operating characteristics the model turbine was tested at different immersion depths and in the half-submerged condition. The power coefficient of the turbine reached a value of almost 0.3 at a tip speed ratio of 2.2 in the fully submerged condition. The turbine had a higher power coefficient in shallow immersion and half submerged condition. The drag coefficient on the whole system decreased with increasing TSR contrary to conventional turbines. The turbine was observed to start rotating at low flow velocities, down to 0.15 m/s. In the study, although the turbine presents a relatively low power coefficient compared to that of competitive turbines, its unique adaptability of immersion depth, including the partially submerged condition, low starting flow velocity and rotational speed offer an interesting prospect for a range of applications.
Weichao Shi, Mehmet Atlar, Roslynna Rosli, Batuhan Aktas, and Rosemary Norman
Elsevier BV
Abstract This paper focuses on the study of cavitation and underwater noise performance of a biomimetically improved horizontal axis tidal turbine (HATT) with a leading edge design inspired by the tubercles on the pectoral fins of humpback whales. Systematic model tests were recently conducted and details of this test campaign together with the findings are summarised in the paper. Several full-scale tidal turbine application cases were studied to understand the full-scale operating conditions considering the characteristics of varied kinds of tidal energy devices, the varying wave height and the flood/ebb tide. A systematic test regime was then designed and conducted. A set of tidal turbines with different leading-edge profiles was manufactured and tested under different loading and hence cavitation conditions. During the tests, cavitation was observed and underwater noise level was measured in comparison with the cavitation and noise performance of a counterpart HATT without tubercles. The tested turbines displayed two main types of cavitation patterns independent of the tubercles. These were steady tip vortex cavitation and relatively intermittent cloud cavitation with a misty appearance. The leading-edge tubercles triggered the cavitation onset earlier for the tidal turbine but constrained the cavitation region to the trough between tubercles with a lesser extent on the blades. The noise performance was strongly related to the blade cavitation hence it was influenced by the leading-edge tubercles. While the turbine was working under the non-cavitating conditions the total noise level was similar to the background noise level. With the increase of the tip speed ratio the noise level was increased, while increasing blade pitch angle reduced the noise level due to lower blade loading. Cavitation inception and noise diagrams are provided as a database for future studies.
Weichao Shi, Roslynna Rosli, Mehmet Atlar, Rosemary Norman, Dazheng Wang, and Wenxian Yang
Elsevier BV
Abstract This paper contributes to the investigations into the feasibility of improving the performance of a marine current turbine using a biomimetic concept inspired from the leading-edge tubercles on the flippers of humpback whales. An experimental test campaign was recently conducted in the Emerson Cavitation Tunnel at Newcastle University and details of this test campaign together with the findings are summarised in the paper. A set of tidal turbines with different leading-edge profiles was manufactured and tested to evaluate the hydrodynamic performance. Various tests were conducted at different flow speed and different pitch angle settings of the turbine blades. The results showed that the models with the leading-edge tubercles had higher power coefficients at lower tip speed ratios (TSRs) and at lower pitch angle settings where the turbine blades were working under stall conditions. Therefore, the tubercles can reduce the turbines' cut-in speed to improve the starting performance. The biomimetic concept did not compromise the maximum power coefficient value of the turbine, being comparable to the device without the tubercles, but shifted the distribution of the coefficient over the range of the tip speed ratios tested.
Weichao Shi, Mehmet Atlar, Kwangcheol Seo, Rosemary Norman, and Roslynna Rosli
American Society of Mechanical Engineers
The tubercles along the leading edges of the humpback whale flippers can provide these large mammals with an exceptional maneuverability. This is due to the fact that the leading-edge tubercles have largely a 3D benefit for the finite hydrofoils, which can maintain the lift, reduce the drag and delay the stall angle. Newcastle University launched a series study to improve a tidal turbine’s performance with the aid of this concept. This paper presents a numerical simulation of the tested hydrofoil, which is representative of a tidal turbine blade, to investigate the flow around the foil and also to numerically model the experiment. This hydrofoil was designed based on an existing tidal turbine blade with the same chord length distribution but a constant pitch angle. The model tests have been conducted in the Emerson Cavitation Tunnel measuring the lift and drag. The results showed that the leading-edge tubercles can significantly improve the performance of the hydrofoil by improving the lift-to-drag ratio and delaying the stall. By applying Shear Stress Transport (SST), Detached Eddy Simulation (DES) and Large Eddy Simulation (LES) via using the commercial CFD solver, Star-CCM+, the tested hydrofoil models were simulated and more detailed flow information has been achieved to complement the experiment. The numerical results show that the DES model is in close agreement with the experimental results. The flow separation pattern indicates the leading-edge tubercles can energize the flow around the hydrofoil to keep the flow more attached and also separate the flow into different channels through the tubercles.