Minke whales (Balaenoptera acutorostrata) are the smallest member of balaenopterid whales and little is known of their kinematics during feeding maneuvers. These whales have narrow and elongated flippers that are small relative to body size compared to related species such as right and gray whales. No experimental studies have addressed the hydrodynamic properties of minke whale flippers and th...

This paper applies a Reinforcement Learning methodology to the problem of airfoil morphing. The reinforcement learning as it is applied to morphing is integrated with a computational model of an airfoil. The computational model utilizes a doublet panel method whose end yield is airfoil lift, drag, and moment coefficients. An episodic unsupervised learning simulation using the Q-Learning method ...

SUMMARY Wind tunnel tests have been done on two families of slim delta aerofoils, having 70° and 80° leading edge sweep. It is shown that by employing a certain type of transverse cross section (having spanwise camber) it is'possible to reduce the lift-dependent drag below that appropriate to an aerofoil with symmetrical sections. The present tests indicate very considerable reductions in the l...

Abstract The aerodynamic characteristics of NACA4412 airfoil with different pitching motion elements were compared and analyzed based on CFD in this research. results are acquired as follows: the difference between lift drag coefficients during pitch up down motions becomes larger increase amplitude or initial angle attack; increases, coefficient grows slightly greater much greater; attack slig...

In the current era of globalization every prosperous nation in this world wishes to develop a fast moving aircraft with a high lift coefficient and low drag coefficient, which helps them to enhance their military force and strengthens its civilization’s foundation. The purpose of this study is to examine the viscous, incompressible and steady-state flow over the F-16 aircraft using computer mod...

Abstract Studying the effect of leading-edge parameters 30P30N on aerodynamic characteristic was carried out. Effect changing gap and overlap slat airfoil were mainly investigated. Numerical simulation applied to obtain characteristics, results show that: lift coefficient in linear segment basically does not change with gap, drag decreases gap. The have obvious lift-to-drag ratio. smaller betwe...

Wind tunnel measurements of the effects on twodimensional section characteristics of square ridge excrescences and of some gaps typical of those found round trailing-edge controls have been made at high subsonic Mach number and at Reynolds numbers up to 15.6 x 106, based on section chord length. The incremental drag due to a square ridge was found to be generally underestimated by applying an e...

A prominent feature of gliding flight in snakes of the genus Chrysopelea is the unique cross-sectional shape of the body, which acts as the lifting surface in the absence of wings. When gliding, the flying snake Chrysopelea paradisi morphs its circular cross-section into a triangular shape by splaying its ribs and flattening its body in the dorsoventral axis, forming a geometry with fore-aft sy...

Chrysopelea paradisi, also known as the flying snake, possesses one of the most unique forms of aerial locomotion found in nature, using its entire body as a dynamic lifting surface without the use of wings or membranes. Unlike other airborne creatures, this species lacks appendages to aid in controlling its flight trajectory and producing lift. The snake exhibits exception gliding and maneuver...