Lift Drag Characterization
Lift Drag Characterization - Related Videos
11:30
Buoyancy and Drag on Immersed Bodies
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2023
Source: Alexander S Rattner and Sanjay Adhikari; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA Objects, vehicles, and organisms immersed in fluid mediums experience forces from the surrounding fluid in the form of buoyancy- a vertical upward force due to fluid weight, drag- a resistive force opposite the direction of motion, and lift- a force perpendicular to the direction of motion. Prediction and characterization of these forces is...
01:23
Drag
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2025
Drag is a resistive force opposing an object’s motion through a fluid, resulting from surface pressure and shear forces. It comprises two components: a perpendicular one from pressure and a tangential one from shear stress. Accurate drag calculations use pressure and wall shear stress distributions, often determined through Computational Fluid Dynamics (CFD) or wind tunnel testing. The drag coefficient, a dimensionless measure, depends on factors like shape, Reynolds number, Mach number, Froude...
01:23
Lift
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2025
Lift is a fundamental aerodynamic force that acts perpendicular to the direction of airflow. It plays a central role in achieving and sustaining flight and in stabilizing various vehicles. Lift primarily originates from pressure differences created across surfaces, such as an airfoil. A lower pressure region forms above the wing, while a higher pressure region forms below it, generating an upward force. This differential results from the shape and orientation of the airfoil, enabling the wing...
09:14
Paw-Dragging: a Novel, Sensitive Analysis of the Mouse Cylinder Test
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Cited by 53 •
2015
Classical forelimb asymmetry analysis of the cylinder test is routinely used to assess behavioural deficits in rats following brain injury or stroke; however, it fails to detect consistent deficits in mice. This study demonstrates that quantifying paw-dragging behaviour is a more sensitive analysis of brain injury in mice.
09:18
Clark Y-14 Wing Performance: Deployment of High-lift Devices (Flaps and Slats)
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2023
Source: David Guo, College of Engineering, Technology, and Aeronautics (CETA), Southern New Hampshire University (SNHU), Manchester, New Hampshire A wing is the major lift-generating apparatus in an airplane. Wing performance can be further enhanced by deploying high-lift devices, such as flaps (at the trailing edge) and slats (at the leading edge) during takeoff or landing. In this experiment, a wind tunnel is utilized to generate certain airspeeds, and a Clark Y-14 wing with a flap and slat...
FAQs
Researchers vary airspeed and angle of attack to observe how aerodynamic forces change across operating conditions. Plotting the resulting measurements produces lift and drag curves, which make performance trends visible rather than limiting the assessment to a single test point. These curves help identify changing efficiency, stall behavior, and practical operating limits.
Lift and drag coefficients provide a standardized way to analyze the measured forces generated during testing. Calculating these corresponding coefficients helps organize results across the tested conditions and supports clearer interpretation of aerodynamic performance. The coefficient data can also be compared with computational or theoretical predictions when evaluating whether a model represents the observed behavior.
The shape of lift and drag curves supplies evidence about how an object performs as test conditions change. In particular, the curves can reveal stall behavior, aerodynamic efficiency, and boundaries on acceptable operation. Engineers use these features to determine where a design performs effectively and where performance or stability considerations may impose restrictions.
A force balance provides a measurement system for determining the lift and drag acting during an engineering test. Its readings are analyzed under controlled variations in airspeed and angle of attack, then used to calculate the associated coefficients. Other measurement systems may also be used, but the essential outcome is quantitative force data suitable for curve development and model evaluation.
A typical workflow begins by testing the object at selected airspeeds and angles of attack. Researchers measure the resulting lift and drag with a force balance or another measurement system, calculate the corresponding coefficients, and organize the results into lift and drag curves. They then interpret efficiency, stall behavior, stability-related performance, and operating limits from those curves.
The results support the design and optimization of aircraft, wings, rotor systems, automotive components, and other fluid-dynamic structures. For each application, measured force trends help engineers assess aerodynamic performance under varied conditions rather than relying only on theoretical expectations. The same evidence can guide refinement of a component or broader system whose behavior depends on fluid-dynamic forces.
Measured lift and drag data provide experimental evidence against which computational and theoretical models can be assessed. Researchers compare the calculated or predicted behavior with the observed force curves and coefficient trends across the tested conditions. Agreement can support confidence in a model, while differences identify areas requiring further analysis or design improvement.