The aerodynamics of flapping flight for the smallest insects such as thrips is often characterized by a 'clap and fling' of the wings at the end of the upstroke and the beginning of the downstroke. These insects fly at Reynolds numbers (Re) of the order of 10 or less where viscous effects are significant. Although this wing motion is known to augment the lift generated during flight, the drag r...

The aerodynamic drag on blunt objects is greater than the drag on streamlined bodies due to the disruptions in flow caused by the leading edge. We have performed experiments in which the tortuosity of samples were altered, using of fibrous samples and measured the resulting drag in a wind tunnel. Our tests show that the magnitude of the drag can be decreased As a result, implementing materials ...

the aim of this work is to find an efficient aerodynamic-based design algorithm for projectile fins and configuration shape optimization. three-dimensional supersonic flow over a projectile with fins at much number 5 and one degree angle of attack was studied. the runge-kutta method and multi-block technique was used to solve the governing equations. a basic configuration was assumed for the fi...

A simple approach for computing unsteady aerodynamic forces from simulated measured strain data is proposed in this study. First, the deflection and slope of the structure are computed from the unsteady strain using the two-step approach. Velocities and accelerations of the structure are computed using the autoregressive moving average model, on-line parameter estimator, low-pass filter, and a ...

Aircraft wings are commonly designed with nonplanar geometry, such as winglets, in order to improve aerodynamic efficiency. This work presents a method for generating wing designs through gradient-based optimization, which is then used investigate the performance characteristics of wings. The parameterization defined give large design space that allows formation highly features and permits chan...

This paper explores the use of sharkskin in improving aerodynamic performance aerofoils. A biomimetic analysis denticles was conducted and were incorporated on surface a 2-Dimensional (2D) NACA0012 aerofoil. The including drag reduction rate, lift enhancement Lift to Drag (L/D) rate for calculated at different locations along chord line aerofoil Angles Attack (AOAs) through Computational Fluid ...