Lift and Drag

This work presents an experimental analysis of the aerodynamic performance of the NACA-0015 airfoil, focusing on the effects of varying the angle of attack on lift, drag, and stall behavior. The design and optimization of an airplane's wing are essential for enhancing lift and minimizing drag, both of which are influenced by changes in the angle of attack during flight. Engineering these aerodynamic dynamics, experiments were conducted using a low-speed wind tunnel at the Misurata University Faculty of Engineering's labs. This setup facilitated the measurement of lift and drag forces across various flow velocities and angles of attack, with a particular focus on identifying early stall points that occur at lower flow velocities. The experimental data were then compared with existing Computational Fluid Dynamics (CFD) simulation results to validate the accuracy and reliability of the experimental findings. This thorough approach provides a powerful insight into the flow dynamics around the NACA-0015 airfoil. This comprehensive approach offers a general understanding of the flow behavior over the NACA-0015 airfoil, expanding our knowledge of its aerodynamic performance and driving advancements in airfoil research within the aviation sector.

Wind energy is one of the most sustainable and renewable resources of power generation. Offshore Wind Turbines (OWTs) derive significant wind energy compared to onshore installations. With the established phenomena that the wind speed has been high and consistent in offshore regions, the OWTs are likely to generate more electricity compared to the onshore ones. Design and installation of OWTs require sophisticated technology due to critical ocean environment to meet the safety and serviceability criteria. This necessitates in-depth understanding of power efficiency, mechanical operations and dynamic force distributions, together with the structural and foundation stabilities. This paper presents an intensive review of the existing knowledge on each of these diversified study areas. It is observed the subject is still under development with a significant number of unsolved problems. A critical analysis and the research directions on the relevant investigations have also been included...

The greatly-stretched lateral opening of penaeid trawls is typically achieved by using relatively large otter boards with an aspect ratio of ~0.5 at high angle of attack (AOA; ~40 �) and low efficiency (lift-to-drag ratio; L/D ~1). Alternatively, the 'batwing' otter board utilises a unique rigging system to allow a flexible sail with an aspect ratio of ~1 to operate at a lower AOA (~20 �). As a result, high effectiveness (lift) and efficiency (L/D ~3) are achieved for small-and medium-size gear. However, for large trawlers it is impractical to simply scale up the current batwing design as this will excessively increase the trawl's height and generate unnecessary drag. Hence, here we experimentally searched for greater hydrodynamic forces from a multi-sail configuration (comprising a jib and main sail) by varying the twist and camber of the two sails. The results suggest that the jib needs to be set at a low AOA compared to the main sail for balanced pressure loading of the two sails, and the main sail requires medium twist to control detrimental centre of pressure characteristics. Ultimately the desired objective for largesized batwing boards might best be achieved using a two-mast configuration that incorporates three sails.

This paper presents a preliminary technical feasibility of using marine current as a possible source of renewable energy production in Kuwait substituting fossil fuel based energy production. Kuwait sea water depth and velocity have been studied in order to obtain the most suitable location for such system. Topographical data collected from Kuwait Institute for Scientific Research for marine currents and seabed have been used in carrying on a simulation study of the proposed system where the possible power output has been estimated. An economical study comparing the implementation of a small standalone generator and the implementation of a marine current generator for a standalone application was carried out showing the advantages of the latter. This preliminary work will help to show that marine current energy is a viable source of energy.

This research paper addresses an novel problemthat has not been addressed in detail for many decades. Ice formation on aircraft has procedures and protocols to deal with expected and actual problems. Complex modern aircraft are equipped with a variety of techniques to remove Ice formation on an aircraft, especially the wings. The introduction of Unmanned Aerial Vehicles has added an old problem, that of low speed and the lack of power to overcome losses in lift through ice formation. In this research the different types of Ice formation, how they combine and affect Lift and Drag are also addresses in theory and application. Furthermore, practical design and operational recommendations are made for take-off and landing.

Wind energy is one of the most sustainable and renewable resources of power generation. Offshore Wind Turbines (OWTs) derive significant wind energy compared to onshore installations. With the established phenomena that the wind speed has been high and consistent in offshore regions, the OWTs are likely to generate more electricity compared to the onshore ones. Design and installation of OWTs require sophisticated technology due to critical ocean environment to meet the safety and serviceability criteria. This necessitates in-depth understanding of power efficiency, mechanical operations and dynamic force distributions, together with the structural and foundation stabilities. This paper presents an intensive review of the existing knowledge on each of these diversified study areas. It is observed the subject is still under development with a significant number of unsolved problems. A critical analysis and the research directions on the relevant investigations have also been included...

Wind energy is one of the most sustainable and renewable resources of power generation. Offshore Wind Turbines (OWTs) derive significant wind energy compared to onshore installations. With the established phenomena that the wind speed has been high and consistent in offshore regions, the OWTs are likely to generate more electricity compared to the onshore ones. Design and installation of OWTs require sophisticated technology due to critical ocean environment to meet the safety and serviceability criteria. This necessitates in-depth understanding of power efficiency, mechanical operations and dynamic force distributions, together with the structural and foundation stabilities. This paper presents an intensive review of the existing knowledge on each of these diversified study areas. It is observed the subject is still under development with a significant number of unsolved problems. A critical analysis and the research directions on the relevant investigations have also been included in the paper.

This work is on the aerodynamics design of the body and frame of a motor tricycle using SolidWorks 2011 modeling system. Its Computational Fluid Dynamics (CFD) feature was used to run simulation tests at a target speed of 150 km/h to evaluate the aerodynamic performance of the tricycle. Simulation results presented shows that lift and drag forces are diminished considerably and that 170 km/h is the maximum speed to be traveled by the tricycle for a smooth and stable ride. Also, the design reduced drastically the effects of lift and drag forces, increased the tricycle’s stability, traction and performance as well as minimized the weight of the tricycle as a result of the use of high performance to mass ratio materials such as carbon fiber for the body and alloy steel for the frame and rims.