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Journal articles on the topic 'Global aerodynamic coefficients'

Author: Grafiati

Published: 15 June 2024

Last updated: 31 July 2025

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1

Albisser, Marie, and Simona Dobre. "Sensitivity Analysis for Global Parameter Identification. Application to Aerodynamic Coefficients." IFAC-PapersOnLine 51, no. 15 (2018): 963–68. http://dx.doi.org/10.1016/j.ifacol.2018.09.069.

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2

Laupré, Gabriel, and Jan Skaloud. "On the Self-Calibration of Aerodynamic Coefficients in Vehicle Dynamic Model-Based Navigation." Drones 4, no. 3 (2020): 32. http://dx.doi.org/10.3390/drones4030032.

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The performance of vehicle dynamic model (VDM)-based navigation largely depends on the accurate determination of aerodynamic coefficients that are unknown a priori. Among different techniques, such as model simulations or experimental analysis in a wind tunnel, the method of self-calibration via state-space augmentation benefiting Global Navigation Satellite System (GNSS) positioning represents an interesting and economical alternative. We study this technique under simulation with the goal of determining the impact of aircraft maneuvers on the precision and (de)-correlation of the aerodynamic

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Svorcan, Jelena, Ognjen Pekovic, and Toni Ivanov. "Estimation of wind turbine blade aerodynamic performances computed using different numerical approaches." Theoretical and Applied Mechanics 45, no. 1 (2018): 53–65. http://dx.doi.org/10.2298/tam171130004s.

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Although much employed, wind energy systems still present an open, contemporary topic of many research studies. Special attention is given to precise aerodynamic modeling performed in the beginning since overall wind turbine performances directly depend on blade aerodynamic performances. Several models different in complexity and computational requirements are still widely used. Most common numerical approaches include: i) momentum balance models, ii) potential flow methods and iii) full computational fluid dynamics solutions. Short explanations, reviews and comparison of the existing computat

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Michálek, Petr, and Stanislav Hračov. "Experimental investigation of aerodynamic coefficients of the Holy Trinity Column in wind tunnel." MATEC Web of Conferences 313 (2020): 00049. http://dx.doi.org/10.1051/matecconf/202031300049.

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The analysis of the aerodynamic force coefficients of the Holy Trinity Column in Olomouc based on the experimental wind tunnel testing is presented. Two aerodynamic models corresponding to geometrical scales 1:75 and 1:150 were built using 3D-printer and tested in the smooth flow in order to define the global static wind effects. The larger model served as a reference case for the tests of the isolated column, while the model build with smaller scale enabled also the experimental examination of the influence of the closest surroundings. The comparison of the aerodynamic coefficients obtained f

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Buzica, Andrei, Lisa Debschütz, Florian Knoth, and Christian Breitsamter. "Leading-Edge Roughness Affecting Diamond-Wing Aerodynamic Characteristics." Aerospace 5, no. 3 (2018): 98. http://dx.doi.org/10.3390/aerospace5030098.

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Diamond wing configurations for low signature vehicles have been studied in recent years. Yet, despite numerous research on highly swept, sharp edged wings, little research on aerodynamics of semi-slender wings with blunt leading-edges exists. This paper reports on the stall characteristics of the AVT-183 diamond wing configuration with variation of leading-edge roughness size and Reynolds number. Wind tunnel testing applying force and surface pressure measurements are conducted and the results presented and analysed. For the investigated Reynolds number range of 2.1 × 10 6 ≤ R e ≤ 2.7 × 10 6

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Jiao, Shenghai, Ling Tao, Hao Wang, Xiao Wang, and Wenjun Ruan. "Aerodynamic Characteristics and Its Sensitivity Analysis of a Cylindrical Projectile at Different Incidences." Applied Sciences 14, no. 15 (2024): 6683. http://dx.doi.org/10.3390/app14156683.

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The accurate evaluation of aerodynamic characteristics is a prerequisite and foundation for the design of high-performance aerodynamic shapes, navigation guidance, and strength of projectiles. The nonlinearity of aerodynamic calculations for a projectile is high, and the modeling and simulation are difficult, especially under the high-angle of attack flight conditions. Small variations in flight conditions, and structural parameters, etc., may cause large deviations in aerodynamic responses. Taking a small cylindrical projectile as an example, and to realize its attitude control, it is necessa

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Zhu, Hongyu, Gang Wang, Yi Liu, and Boping Ma. "Uncertainty Analysis of Supersonic Biplane's Aerodynamic Characteristics." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 37, no. 5 (2019): 909–17. http://dx.doi.org/10.1051/jnwpu/20193750909.

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Utilizing the interference of shock and expansion waves, supersonic biplane can reduce the wave drag remarkably. However, the supersonic biplane is only designed at special conditions, so that it has poor performance at off-design conditions. To analyze supersonic biplane's aerodynamic characteristics at off-design conditions, the non-instructive probabilistic collocation method has been employed to achieve uncertainty quantification. Besides, Sobol global sensitivity is adopted to accurately evaluate the influence of the input uncertainty parameters. The uncertainty parameters are Mach number

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Wiński, Krzysztof, and Adam Piechna. "Comprehensive CFD Aerodynamic Simulation of a Sport Motorcycle." Energies 15, no. 16 (2022): 5920. http://dx.doi.org/10.3390/en15165920.

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Nowadays, aerodynamics is a key focal point in the vehicle design process. Beyond its direct impact on the performance of a vehicle, it also has significant effects on economics and safety. In the last decade numerical methods, mainly Computational Fluid Dynamics (CFD), have established themselves as a reliable tool that assists in the design process and complements classical tunnel tests. However, questions remain about the possible obtained accuracy, best practices and applied turbulence models. In this paper, we present a comprehensive study of motorcycle aerodynamics using CFD methods whic

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Zalewski, Wiesław. "The Impact of Propeller on Aerodynamics of Aircraft / Wpływ Śmigła Na Aerodynamikę Samolotu." Journal of KONBiN 33, no. 1 (2015): 209–22. http://dx.doi.org/10.1515/jok-2015-0018.

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Abstract The paper presents a numerical analysis of the impact of working propellers on the aerodynamics of the aircraft. Analysis was made on the example of a twin-engined, unmanned aircraft with electric drive during the low altitude flight. Three configurations were studied and compared: the plane without propellers, the plane with pusher propellers and the plane with tractor propellers. For each configuration distributions of aerodynamic coefficients along the span of the wing and their global values for the entire aircraft were estimated. Calculations were performed using the Fluent solve

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10

Le-Duc, Thang, and Quoc-Hung Nguyen. "Aerodynamic Optimal Design for Horizontal Axis Wind Turbine Airfoil Using Integrated Optimization Method." International Journal of Computational Methods 16, no. 08 (2019): 1841004. http://dx.doi.org/10.1142/s0219876218410049.

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In this work, a new approach for aerodynamic optimization of horizontal axis wind turbine (HAWT) airfoil is presented. This technique combines commercial computational fluid dynamics (CFD) codes with differential evolution (DE), a reliable gradient-free global optimization method. During the optimization process, commercial CFD codes are used to evaluate aerodynamic characteristics of HAWT airfoil and an improved DE algorithm is utilized to find the optimal airfoil design. The objective of this research is to maximize the aerodynamic coefficients of HAWT airfoil at the design angle of attack (

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Fontanella, Alessandro, Ilmas Bayati, Robert Mikkelsen, Marco Belloli, and Alberto Zasso. "UNAFLOW: a holistic wind tunnel experiment about the aerodynamic response of floating wind turbines under imposed surge motion." Wind Energy Science 6, no. 5 (2021): 1169–90. http://dx.doi.org/10.5194/wes-6-1169-2021.

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Abstract. Floating offshore wind turbines are subjected to large motions due to the additional degrees of freedom of the floating foundation. The turbine rotor often operates in highly dynamic inflow conditions, and this has a significant effect on the overall aerodynamic response and turbine wake. Experiments are needed to get a deeper understanding of unsteady aerodynamics and hence leverage this knowledge to develop better models and to produce data for the validation and calibration of existing numerical tools. In this context, this paper presents a wind tunnel experiment about the unstead

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Othman, Norazila, and Masahiro Kanazaki. "Development of Digital Flight Motion Methodology Based on Aerodynamic Derivatives Approximation." Journal of Robotics and Mechatronics 28, no. 2 (2016): 215–25. http://dx.doi.org/10.20965/jrm.2016.p0215.

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[abstFig src='/00280002/12.jpg' width=""300"" text='3D contour views of Cz [-0.4—1.05],Mach:0.6-1.4, Alpha:0°-30°' ]The accuracy of efficient flight simulation depends on the quality of the aerodynamic data used to simulate aircraft dynamic motion. The accuracy of such data prediction depends strongly on motion variables, aerodynamic derivatives, and the coefficients used when the complete global aerodynamic database is being building. A surrogate model applied as a prediction method based on several measured points (exact function) used to predict unknown points of interest helps reduce time

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13

Zhang, Ao, Yan Liu, Jinguang Yang, Zhi Li, Chuang Zhang, and Yiwen Li. "Machine learning based design optimization of centrifugal impellers." Journal of the Global Power and Propulsion Society 6 (July 25, 2022): 124–34. http://dx.doi.org/10.33737/jgpps/150663.

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Big data and machine learning are developing rapidly, and their applications in the aerodynamic design of centrifugal impellers and other turbomachinery have attracted wide attention. In this paper, centrifugal impellers with large flow coefficient (0.18–0.22) are taken as research objects. Firstly, through one-dimensional design and optimization, main one-dimensional geometric parameters of those centrifugal impellers are obtained. Subsequently, hundreds of samples of centrifugal impellers are obtained by using an in-house parameterization program and Latin hypercube sampling method. The NUME

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Flora, Andrea, Pasquale Capasso, Simona Brancaccio, Paolo Ambrico, Alessio D’Onofrio, and Francesco De Stasio. "Effect of control surfaces on the aerodynamic database of the Stratofly hypersonic vehicle." MATEC Web of Conferences 304 (2019): 02021. http://dx.doi.org/10.1051/matecconf/201930402021.

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This paper aims at studying the control surfaces of the STRATOFLY project reference aircraft, funded by the European Commission, under the framework of Horizon 2020 plan. The values of aerodynamic coefficients in a wide range of flow free-stream conditions are stored in the aircraft aerodynamic database. The research goal is to update a pre-existent database that was developed with fixed control surfaces using the six control surfaces deflection as input. Different Mach numbers determine different flow regimes: subsonic, transonic, supersonic, and hypersonic. In subsonic, transonic and low sup

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15

Liu, Albert. "The future of flying: Explore more energy-efficient airplane wings." Applied and Computational Engineering 91, no. 1 (2024): 159–74. http://dx.doi.org/10.54254/2755-2721/91/20240953.

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In recent years, there has been a substantial rise in the popularity of air travel, bringing with it a surge in the consumption of jet fuel, a nonrenewable resource responsible for 2.4% of global carbon emissions. As air travel continues to gain prevalence, the anticipation of a significant increase in carbon emissions and a subsequent surge in jet fuel costs looms large. Maintaining affordability in air travel while mitigating carbon emissions necessitates a focus on maximizing airfoil efficiency. This study investigates how airplane wing design affects the aerodynamic performance of aircraft

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Liu, Albert. "The future of flying: Explore more energy-efficient airplane wings." Applied and Computational Engineering 72, no. 1 (2024): 16–31. http://dx.doi.org/10.54254/2755-2721/72/20240953.

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In recent years, there has been a substantial rise in the popularity of air travel, bringing with it a surge in the consumption of jet fuel, a nonrenewable resource responsible for 2.4% of global carbon emissions. As air travel continues to gain prevalence, the anticipation of a significant increase in carbon emissions and a subsequent surge in jet fuel costs looms large. Maintaining affordability in air travel while mitigating carbon emissions necessitates a focus on maximizing airfoil efficiency. This study investigates how airplane wing design affects the aerodynamic performance of aircraft

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17

DINA, Adrian, Sterian DANAILA, Mihai-Victor PRICOP, and Ionut BUNESCU. "Using genetic algorithms to optimize airfoils in incompressible regime." INCAS BULLETIN 11, no. 1 (2019): 79–90. http://dx.doi.org/10.13111/2066-8201.2019.11.1.6.

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Aerodynamic optimization is a very actual problem in aircraft design and airfoils are basic two-dimensional shape forming cross sections of wings. Traditionally, the airfoil geometry if defined by a very large number of coordinates. Nowadays, in order to simplify the optimization, the airfoil geometry is approximated by a parametrization, which enables to reduce the number of needed parameters to as few as possible, while effectively controlling the major aerodynamic features. The present work has been done on the Class-Shape function Transformation method (CST) [1, 2]. Also, the paper introdu

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18

Erdogdu, Ahmed Oguzhan, Steffen Hüttig, Juan Camilo Londono Alfaro, Timo Gericke, and Andreas Schröder. "Large-Scale Side By Side Stereo-PIV Measurements In An Automotive Wind Tunnel: Aerodynamic Influence Of Ride Height Variations." Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 21 (July 8, 2024): 1–14. http://dx.doi.org/10.55037/lxlaser.21st.46.

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In this investigation, we conducted large-scale Stereo PIV experiments in the flow around a Volkswagen ID.4. within the Aerodynamic and Aeroacoustic Wind Tunnel (AAK) at Volkswagen AG, Wolfsburg. The primary objective of these experiments was to investigate the effects of ride height variation on the near wake of the passenger vehicle using Stereo PIV, while minimizing wind tunnel occupancy. The measurements aimed to create datasets for CFD validation to improve virtual aerodynamic development capabilities of passenger vehicles. The experiment was performed on a 1:1 scale vehicle and multiple

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Pereira, Diogo, Frederico Afonso, and Fernando Lau. "End-to-End Deep-Learning-Based Surrogate Modeling for Supersonic Airfoil Shape Optimization." Aerospace 12, no. 5 (2025): 389. https://doi.org/10.3390/aerospace12050389.

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Aerodynamic shape design optimization faces challenges due to the computational demands and the vast design space, limiting its practicality and scalability. While progress has been made in subsonic and transonic regimes, the real-time optimization for supersonic conditions remains unexplored. To bridge this gap, this work exploits knowledge learned from subsonic and transonic real-world data and introduces a rapid optimization framework tailored for the supersonic regime. A novel end-to-end multitask Convolutional Neural Network is proposed to predict the aerodynamic coefficients of an airfoi

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Kumkhuntod, Peerapong, Thanathanya Kongkam, Paroon Krerkbenjathum, Songkitti Runsungnoen, Pawat Chunhachatrachai, and Kamthon Septham. "Active Flow Control of the Unsteady Wake behind a Square-Back Road Vehicle using Synthetic Jets." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 130, no. 2 (2025): 166–79. https://doi.org/10.37934/arfmts.130.2.166179.

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Road transportation is particularly one of the significant contributors to greenhouse gas emissions, a dominant cause of global warming. To lessen fuel consumption and greenhouse gas emission, aerodynamic drag reduction of road vehicles is one of the viable techniques. The aim of the present study is to investigate the effectiveness of active flow control by means of synthetic jet actuators to reduce aerodynamic drag of a simplified truck model (a square-back Ahmed body). Numerical simulations of a three-dimensional unsteady airflow over a square-back Ahmed body were performed at the Reynolds

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Christopher, Sundar, and Pawan Gupta. "Global Distribution of Column Satellite Aerosol Optical Depth to Surface PM2.5 Relationships." Remote Sensing 12, no. 12 (2020): 1985. http://dx.doi.org/10.3390/rs12121985.

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Using a combined Terra and Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) mid-visible aerosol optical depth (AOD) product at 0.1 × 0.1-degree spatial resolution and collocated surface PM2.5 (particulate matter with aerodynamic diameter smaller than 2.5 μm) monitors, we provide a global five-year (2015–2019) assessment of the spatial and seasonal AOD–PM2.5 relationships of slope, intercepts, and correlation coefficients. Only data from ground monitors accessible through an open air-quality portal that are available to the worldwide community for air quality research and decision mak

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Patil, A., and J. Navrátil. "CFD analysis of wing-propeller interaction on the NASA X-57 Maxwell aircraft wing." Journal of Physics: Conference Series 2716, no. 1 (2024): 012002. http://dx.doi.org/10.1088/1742-6596/2716/1/012002.

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Abstract Due to global warming concerns, the Aviation industry is trying to reduce its carbon footprint. Electric propulsion (EP) is one way of doing this, where the power is obtained from electrical sources. The concept of distributed electric propulsion (DEP) is in the focus now. NASA’s X-57 Maxwell, a high winged, all-electric experimental aircraft, uses this concept. The present work aims at developing a CFD model (ANSYS Fluent) to evaluate aerodynamic performance of two configurations of NASA’s X-57 aircraft wing; (i) wing and nacelle (clean wing) and (ii) wing, nacelle and one electric p

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Li, Peng, Bo Li, Xiaoyu Han, Yuji Tian, and Ruoqi Li. "Experimental Study on Wind Loading Characteristics of Trains under Stationary Tornado-like Vortices." Buildings 12, no. 9 (2022): 1377. http://dx.doi.org/10.3390/buildings12091377.

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The risk of trains being hit by tornadoes in China continues to increase due to the increasing density of railway lines and the shortening of the train departure intervals and the increasing probability of extreme weather phenomena caused by global climate change. If a train is hit by a tornado, it will cause huge casualties and economic losses, so it is necessary to investigate the tornado-induced effects on trains. A series of rigid-model wind pressure measurement tests on a train car under tornado wind loading were conducted using a tornado-vortex simulator, in order to determine the effect

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Lu, Yi. "Optimizing vehicle aerodynamics through the synergistic application of Design of Experiments (DoE) and Computational Fluid Dynamics (CFD)." Highlights in Science, Engineering and Technology 76 (December 31, 2023): 544–63. http://dx.doi.org/10.54097/ns22b830.

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The aerodynamic design of cars not only creates aesthetic and diverse car shapes, but also ensures their safety and fuel economy. According to Mustafa Cakir's research[1], approximately of the fuel consumption of a car traveling at high speeds is used to counteract air resistance. However, with the increasing severity of global warming, emissions standards for automobile exhaust are becoming increasingly stringent. Considering that gasoline vehicles still dominate the household car market, optimizing the aerodynamic design of automobiles is imperative. This work analyzes and optimizes the aero

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Bosak, Grzegorz. "Wind tunnel tests of wind action on a high-rise building." Budownictwo i Architektura 13, no. 2 (2014): 163–71. http://dx.doi.org/10.35784/bud-arch.1891.

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The paper summarizes the results of wind tunnel tests of a wind action on a high-rise building design in Warsaw. Measurements were accomplished in Wind Engineering Laboratory of Cracow University of Technology. Wind pressures on external surfaces of the building model were acquired. A study of the character of the wind action on a tower of the building was the main aim of the paper. A triangle shape with rounded corners of the cross section of the tower and a complex group of neighbor buildings support aerodynamic analysis in a wind tunnel. Wind pressure coefficients on the external building s

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Abu-Abdou, K., and M. F. Zedan. "Performance of improved thin aerofoil theory for modern aerofoil sections." Aeronautical Journal 95, no. 942 (1991): 64–70. http://dx.doi.org/10.1017/s0001924000023526.

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AbstractThe improved thin aerofoil method, which features extended expressions for lift and moment coefficients, is considered for further investigation and validation. The procedure to calculate the singularity coefficients is improved by using all aerofoil coordinates as control points in a least squares scheme. The classical NACA 0012 and NACA 65012 sections, the modern aviation aerofoil LS(1)—0417 and the extremely thick Kennedy-Marsden aerofoil are validated in place of the previously cited Karman-Trefftz aerofoil. This selection covers thickness ratios of up to 27·9%, camber ratios up to

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Ang, Edward B., and Jaime P. Honra. "Theoretical Aerodynamic Performance and FEA Analysis of a Novel Three-Blade Savonius Wind Turbine Blade with Pointed Deflectors." Dynamics 5, no. 1 (2025): 8. https://doi.org/10.3390/dynamics5010008.

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Global climate change has renewed interest in wind energy adoption and integration for on-grid and off-grid applications. Savonius wind turbines offer substantial advantages for small-scale energy generation in low-wind speed conditions, like urban environments, but suffer from low efficiency. This study focused on the numerical characterization of a novel compact three-blade Savonius rotor design with modified pointed deflectors to promote better flow attachment and enhance airflow guidance directionality. Computational Fluid Dynamics (CFD) was employed to identify the flow characteristics an

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Zhao, Jian, Haiyang Li, Xiangyue He, Yuechen Huang, and Jianghui Liu. "Uncertainty Analysis for Return Trajectory of Vertical Takeoff and Vertical Landing Reusable Launch Vehicle." Mathematical Problems in Engineering 2020 (July 11, 2020): 1–18. http://dx.doi.org/10.1155/2020/4313758.

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The uncertainties during the return trajectory of vertical takeoff and vertical landing reusable launch vehicle weaken the ability of precision landing and make the return process more challenging. This paper is devoted to quantifying the probability uncertainty of return trajectory with uncertain parameters. The uncertainty model of return multi-flight-phase under the uncertainties of initial flight path angle, axial aerodynamic coefficient, and atmospheric density is established using the generalized polynomial chaos expansion method. By parameterizing random uncertainties and introducing ra

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Eiximeno, Benet, Carlos Tur-Mongé, Oriol Lehmkuhl, and Ivette Rodríguez. "Hybrid Computation of the Aerodynamic Noise Radiated by the Wake of a Subsonic Cylinder." Fluids 8, no. 8 (2023): 236. http://dx.doi.org/10.3390/fluids8080236.

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The noise radiated by the flow around a cylinder in the subcritical regime at ReD=1×104 and at a subsonic Mach number of M=0.5 is here studied. The aerodynamic sound radiated by a cylinder has been studied with a wide range of Reynolds numbers, but there are no studies about how the Mach number affects the acoustic field in the subsonic regime. The flow field is resolved by means of large-eddy simulations of the compressible Navier–Stokes equations. For the study of the noise propagation, formulation 1C of the Ffowcs Williams–Hawkings analogy is used. The fluid flow results show good agreement

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Kepekci, Haydar. "Comparative Numerical Aerodynamics Performance Analysis of NACA0015 and NACA4415 Airfoils." International Journal of Engineering, Science and Information Technology 2, no. 1 (2022): 144–51. http://dx.doi.org/10.52088/ijesty.v2i1.236.

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The climate crisis caused by global greenhouse gas emissions has led to many disasters around the world in recent years. Some of these disasters are floods in various parts of Europe, melting of Arctic glaciers, and rising water levels in the oceans. People living on islands in Southeast Asian countries are forced to migrate due to rising water levels. With the increase in the frequency of such situations, life on earth is at risk. Greenhouse gas emissions harm not only humans but also animals and plants. The most effective measure that can be taken against this is to stay away from fossil fue

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Pytel, Krzysztof, Stanislaw Gumula, Piotr Dudek, et al. "Testing the performance characteristics of specific profiles for applications in wind turbines." E3S Web of Conferences 108 (2019): 01015. http://dx.doi.org/10.1051/e3sconf/201910801015.

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The publication presents the results of aerodynamic characteristics of selected profile blades for applications in wind turbines. Considering the potential of energy resources and investors’ preferences, the amount of energy produced in wind farms in the total amount of electricity generated will be systematically growing and probably, in the next few years, wind energy will be the first in the field of electricity production from all types of power plants. Harnessing the power of moving air masses is now a global phenomenon. Rotor wheel converts wind energy into mechanical energy when using b

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Svorcan, Jelena. "WMLES of flows around small-scale propellers - estimating aerodynamic performance and wake visualization." Theoretical and Applied Mechanics, no. 00 (2023): 10. http://dx.doi.org/10.2298/tam231012010s.

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Wall-modeled large-eddy simulation (WMLES) is an advanced mathematical model for turbulent flows which solves for the low-pass filtered numerical solution. A subgrid-scale (SGS) model is used to account for the effects of unresolved small-scale turbulent structures on the resolved scales (i.e. for the dissipation of the smaller scales), while the flow behavior near the walls is modeled by wall functions (thus reducing the requirements for mesh fineness/ quality). This paper investigates the possibilities of applying WMLES in the estimation of aerodynamic performance of small-scale propellers,

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Quesada-Bedoya, Luis Felipe, David Lebrun-Llano, Gabriel Espitia-Mesa, Jorge Mario Tamayo-Avendaño, and Gilberto Osorio-Gómez. "Aerodynamic Comparison of Conventional and Bioinspired Turbines for Enhanced Wind Energy Applications in Low Wind Conditions." E3S Web of Conferences 612 (2025): 01001. https://doi.org/10.1051/e3sconf/202561201001.

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Wind energy is projected to account for 35% of global production by 2050, with a significant contribution from large wind farms located in high-wind-speed areas. However, in low-wind regions, it is necessary to adapt turbines to maximize efficiency. This has led to the development of blades based on biomimetic principles, which improve performance in such conditions. To validate this approach, a comparative aerodynamic analysis is proposed between a conventional and a bio-inspired turbine. The proposed methodology involves using Computational Fluid Dynamics (CFD) simulations and Blade Element

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Bekemeyer, P., R. Thormann, and S. Timme. "Rapid gust response simulation of large civil aircraft using computational fluid dynamics." Aeronautical Journal 121, no. 1246 (2017): 1795–807. http://dx.doi.org/10.1017/aer.2017.104.

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ABSTRACTSeveral critical load cases during the aircraft design process result from atmospheric turbulence. Thus, rapidly performable and highly accurate dynamic response simulations are required to analyse a wide range of parameters. A method is proposed to predict dynamic loads on an elastically trimmed, large civil aircraft using computational fluid dynamics in conjunction with model reduction. A small-sized modal basis is computed by sampling the aerodynamic response at discrete frequencies and applying proper orthogonal decomposition. The linear operator of the Reynolds-averaged Navier-Sto

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Bantscheff, Konstantin, and Christian Breitsamter. "Dynamic Structural Scaling Concept for a Delta Wing Wind Tunnel Configuration Using Additive Manufacturing." Aerospace 10, no. 7 (2023): 581. http://dx.doi.org/10.3390/aerospace10070581.

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Considering aeroelastic effects plays a vital role in the aircraft design process. The construction of elastic wind tunnel models is a critical element in the investigation of occurring aeroelastic phenomena. However, the structural scaling between full-scale and reduced-scale configurations is a complex design and manufacturing task and is usually avoided in wind tunnel testing. This work proposes a numerical approach for a dynamic aeroelastic scaling technique, which is applied to a fictive delta wing configuration. This scaling methodology is designed to optimise the structural layout of wi

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Allet, A., S. Halle´, and I. Paraschivoiu. "Numerical Simulation of Dynamic Stall Around an Airfoil in Darrieus Motion." Journal of Solar Energy Engineering 121, no. 1 (1999): 69–76. http://dx.doi.org/10.1115/1.2888145.

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The objective of this study is to investigate the two-dimensional unsteady flow around an airfoil undergoing a Darrieus motion in dynamic stall conditions. For this purpose, a numerical solver based on the solution of the Reynolds-averaged Navier-Stokes equations expressed in a streamfunction-vorticity formulation in a non-inertial frame of reference was developed. The governing equations are solved by the streamline upwind Petrov-Galerkin finite element method (FEM). Temporal discretization is achieved by second-order-accurate finite differences. The resulting global matrix system is lineariz

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Fadlan, Ahmad, I. Dewa Gede Agung Junnaedhi, Nurjanna Joko Trilaksono, Ahmad Furqon, and Atsushi Inagaki. "Preliminary Results from Micrometeorological Observation in Sub-Urban Area of Tangerang, Indonesia." IOP Conference Series: Earth and Environmental Science 1472, no. 1 (2025): 012010. https://doi.org/10.1088/1755-1315/1472/1/012010.

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Abstract This study reports preliminary micrometeorological observations in suburban Tangerang, Banten, Indonesia, a rapidly urbanizing area influenced by Jakarta’s expansion. Monitoring micrometeorological conditions is essential to understand the impacts of rapid landscape changes in such transitional zones. Observations were conducted on the rooftop of the STMKG building, 43 m above ground, using an ultrasonic anemometer, global radiation sensor, downward longwave radiation sensor, and an ambient temperature-humidity sensor. Data were logged at a high frequency of 10 Hz over an 8-day period

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Jin, Yanchen, and Yiqi Yao. "Research on the Relationship between the Glide and Aspect Ratio." Highlights in Science, Engineering and Technology 128 (February 25, 2025): 124–32. https://doi.org/10.54097/handtp75.

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Global warming along with other environmental issues like El Niño has radically reconfigured the biosphere mainly because of the increasing carbon footprint human beings have made up. The whole aviation industry shares the responsibility as manufacturers compete on the innovation of better aerodynamic shape of airplanes, application of a new type of sustainable fuel for decarbonization, and development of highly fuel-efficient turbofan engines. The objective of this study is to analyse glider airfoils with the now worldwide application, identify parameters affecting the glide ratio as well as

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Eftekhari, Hesam, Abdulkareem Sh Mahdi Al-Obaidi, and Sucharita Srirangam. "Numerical Investigation of Hybrid Savonius-Darrieus Vertical Axis Wind Turbine at Low Wind Speeds." Journal of Physics: Conference Series 2523, no. 1 (2023): 012032. http://dx.doi.org/10.1088/1742-6596/2523/1/012032.

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Abstract The need for electricity on the Earth is increasing day by day, and this requires building more electric power plants where most of the power plants cause CO2 emission which would increase the global warming. Using wind energy as one type of renewable energies, would contribute to reduce the global warming. In countries such as Malaysia where the average annual wind speed is 2-2.5 m/s using wind energy is a challenge because of the low wind speed. However, using a hybrid Savonius-Darrieus vertical axis wind turbine in low wind speed areas, the performance of the wind turbine may incre

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Dudley, R., and P. Chai. "Animal flight mechanics in physically variable gas mixtures." Journal of Experimental Biology 199, no. 9 (1996): 1881–85. http://dx.doi.org/10.1242/jeb.199.9.1881.

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Empirical studies of animal flight performance have generally been implemented within the contemporary atmosphere. Experimental alteration of the physical composition of gas mixtures, however, permits construction of novel flight media and the non-invasive manipulation of flight biomechanics. For example, replacement of atmospheric nitrogen with various noble gases results in a tenfold variation in air density at a constant oxygen concentration. Such variation in air density correspondingly elicits extraordinary biomechanical effort from flying animals; hummingbirds and euglossine orchid bees

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Wang, Lin, Xinzi Tang, and Xiongwei Liu. "Blade Design Optimisation for Fixed-Pitch Fixed-Speed Wind Turbines." ISRN Renewable Energy 2012 (August 16, 2012): 1–8. http://dx.doi.org/10.5402/2012/682859.

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Fixed-pitch fixed-speed (FPFS) wind turbines have some distinct advantages over other topologies for small wind turbines, particularly for low wind speed sites. The blade design of FPFS wind turbines is fundamentally different to fixed-pitch variable-speed wind turbine blade design. Theoretically, it is difficult to obtain a global mathematical solution for the blade design optimisation. Through case studies of a given baseline wind turbine and its blade airfoil, this paper aims to demonstrate a practical method for optimum blade design of FPFS small wind turbines. The optimum blade design is

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BALABAN, Anton, Sorin BERBENTE, Andrei NEAMTU, et al. "Case study of TCAS implementation in modern FMS." INCAS BULLETIN 15, no. 2 (2023): 11–19. http://dx.doi.org/10.13111/2066-8201.2023.15.2.2.

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In this paper, uncertainty is included in the extended framework of global air traffic both through the action of the wind and through the incomplete determination of the aerodynamic coefficients and the inevitable imprecision involved in the execution of ATC instructions. In order to study the air conflict detection process in detail, the possibility of potential conflicts must be evaluated, considering the current state of the international airspace, and taking into account the uncertainty in calculating the future position of the aircraft. A mathematical model for predicting potential aeria

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Benavent-Oltra, Jose Antonio, Juan Andrés Casquero-Vera, Roberto Román, et al. "Overview of the SLOPE I and II campaigns: aerosol properties retrieved with lidar and sun–sky photometer measurements." Atmospheric Chemistry and Physics 21, no. 12 (2021): 9269–87. http://dx.doi.org/10.5194/acp-21-9269-2021.

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Abstract. The Sierra Nevada Lidar aerOsol Profiling Experiment I and II (SLOPE I and II) campaigns were intended to determine the vertical structure of aerosols by remote sensing instruments and test the various retrieval schemes for obtaining aerosol microphysical and optical properties with in situ measurements. The SLOPE I and II campaigns were developed during the summers of 2016 and 2017, respectively, combining active and passive remote sensing with in situ measurements at stations belonging to the AGORA observatory (Andalusian Global ObseRvatory of the Atmosphere) in the Granada area (S

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Lajnef, Mariem, Mabrouk Mosbahi, Zied Driss, et al. "Numerical Model Parameters Impact on Savonius Wind Rotor Performance." CFD Letters 17, no. 5 (2024): 58–75. https://doi.org/10.37934/cfdl.17.5.5875.

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Global greenhouse gas emissions are mostly caused by the production of energy extracted from fossil fuels sources. Indeed, the use of renewable clean energy has become crucial to supply the world demand while protecting the planet. For many years, there has been a great deal of interest in wind energy because it is a clean, sustainable energy source. Because of its cheaper cost and independence from wind direction, the Savonius vertical axis wind rotor has the advantage of being suitable for certain implementations as an energy converter. Several studies have been carried out to increase its e

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Hamiga, Władysław Marek, and Wojciech Bronisław Ciesielka. "Numerical Analysis of Aeroacoustic Phenomena Generated by Heterogeneous Column of Vehicle." Energies 15, no. 13 (2022): 4669. http://dx.doi.org/10.3390/en15134669.

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The last decade has seen an exponential interest in conventional and unconventional energy issues. This trend has also extended to road transport issues and is driven by expectations to minimize fuel and/or energy consumption and negative environmental impact. In the global literature, much attention is focused on the work of autonomous transport, both passenger and trucks, and on the phenomena of platooning. The paper presents original aerodynamic and aeroacoustic tests of heterogeneous vehicle columns. In the work, models of a car, a van and a truck were built, followed by heterogeneous colu

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You, Wonhee, Hyukbin Kwon, Joonhyuk Park, and Yujeong Shin. "Effect of wind gusts on the dynamics of railway vehicles running on a curved track." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 232, no. 4 (2017): 1103–20. http://dx.doi.org/10.1177/0954409717708924.

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Due to global warming, there is an increasing number of wind gusts that affect the stability of railway vehicles. A railway vehicle running on a curved track during a wind gust is subjected to multiple forces simultaneously, which include the centrifugal force and forces exerted by the wind gust and cant, and they significantly affect the vehicle’s dynamic characteristics as well as its safety. The forces increase the vibration of carbodies and the risk of derailment and overturning of cars; the effect is worse on irregular tracks. In order to review the phenomenon in detail, a 1/20 scale mode

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Reddy, Likhitha Ramesh, Dimitra Karystinou, Daniel Milano, John Walker, and Axelle Viré. "Influence of wind-wave characteristics on floating wind turbine loads: A sensitivity analysis across different floating concepts." Journal of Physics: Conference Series 2767, no. 6 (2024): 062030. http://dx.doi.org/10.1088/1742-6596/2767/6/062030.

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Abstract Floating offshore wind turbines experience different operating conditions, such as wind and wave inflow characteristics. Accurate prediction of the loads acting on the floating wind system is essential for the system design and optimisation. However, there are a lot of uncertainties with the modelling input variables for time domain simulation tools such as OpenFAST to represent various hydro-aerodynamic and structural properties. The primary objective of this work is to identify the critical input parameters for different damage-equivalent load outputs for two substructure types: OC3

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Engelbrecht, Johann P., Hans Moosmüller, Samuel Pincock, R. K. M. Jayanty, Traci Lersch, and Gary Casuccio. "Technical note: Mineralogical, chemical, morphological, and optical interrelationships of mineral dust re-suspensions." Atmospheric Chemistry and Physics 16, no. 17 (2016): 10809–30. http://dx.doi.org/10.5194/acp-16-10809-2016.

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Abstract. This paper promotes an understanding of the mineralogical, chemical, and physical interrelationships of re-suspended mineral dusts collected as grab samples from global dust sources. Surface soils were collected from arid regions, including the southwestern USA, Mali, Chad, Morocco, Canary Islands, Cabo Verde, Djibouti, Afghanistan, Iraq, Kuwait, Qatar, UAE, Serbia, China, Namibia, Botswana, Australia, and Chile. The < 38 µm sieved fraction of each sample was re-suspended in a chamber, from which the airborne mineral dust could be extracted, sampled, and analyzed. Instruments inte

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Liu, Chun Ke, and Jiao Wang. "Bus Body Design and Calculation of Aerodynamic Drag Coefficient." Applied Mechanics and Materials 496-500 (January 2014): 2655–59. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.2655.

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With the ownership of Chinese automotive increasing, the road is more and more crowded and the energy crisis swept the global at the same time, which requires us to develop the larger buses now. According to the company standard and the related laws and regulations，a 12m bus body is designed. Build the 12m bus body’s 3D model by UniGraphics NX，generate mesh generation about the 3D model in the GAMBIT and calculate the aerodynamic drag coefficient using the FLUENT software, after all this, the 12m bus body whose the aerodynamic drag coefficient meets the needs of low speed characteristics is su

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Cheng, Ji, Ping Jiang, Qi Zhou, et al. "A lower confidence bounding approach based on the coefficient of variation for expensive global design optimization." Engineering Computations 36, no. 3 (2019): 830–49. http://dx.doi.org/10.1108/ec-08-2018-0390.

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PurposeEngineering design optimization involving computational simulations is usually a time-consuming, even computationally prohibitive process. To relieve the computational burden, the adaptive metamodel-based design optimization (AMBDO) approaches have been widely used. This paper aims to develop an AMBDO approach, a lower confidence bounding approach based on the coefficient of variation (CV-LCB) approach, to balance the exploration and exploitation objectively for obtaining a global optimum under limited computational budget.Design/methodology/approachIn the proposed CV-LCB approach, the

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