In order to improve the energy capture performance of vertical axis lift wind turbines in a low speed environment, drag turbine is employed couple with design existing turbines. contrast literature, this work, computational model proposed that can simulate interaction between and fluid. The effects pitch angle (β), installation (θ), overlap ratio (ε) diameter (DL) on hybrid are systematically a...

In this paper, two-dimensional computational fluid dynamics analyses were conducted to examine the rib effect on performance of NACA 0018 plain flapped airfoil. A mesh independence study was carried out and Spalart-Allmaras turbulence model selected for validation. Four various airfoil models designed: M1 (airfoil without flap structure), M2 with M3 a flap) M4 structure flap). The designed airf...

Shape optimization of the airfoil with high aspect ratio of long endurance unmanned aerial vehicle (UAV) is performed by the multi-objective optimization technology coupled with computational fluid dynamics (CFD). For predicting the aerodynamic characteristics around the airfoil the high-fidelity Navier-Stokes solver is employed and SMOGA (Simple Multi-Objective Genetic Algorithm), which is dev...

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...

We examined the effects of aerodynamic forces on the mechanical power output of running insects for which kinematic data were available. Drag and lift on the cockroaches Periplaneta americana (a small, rapidly running species) and Blaberus discoidalis (a larger, more slowly moving species) were measured in a wind tunnel. Although lift would be expected to affect power output by altering functio...

The purpose of this study is to improve the aerodynamic performance of wind turbine blades, using the Ball-Spine inverse design method. The inverse design goal is to calculate a geometry corresponds to a given pressure distribution on its boundaries. By calculating the difference between the current and target pressure distributions, geometric boundaries are modified so that the pressure di...

The aim of the study is to investigate how choice airfoil affects aerodynamic characteristics a flying wing UAV. For this purpose, comparative analyzes were performed for four different airfoils: MH60, TL54, Eppler 339, and TsAGI 12%. Given maximum range performance (maximum lift /drag ratio), best efficiency given by UAV with MH60 TL54 airfoil. Based on their lift-to-drag ratio, UAVs made airf...

At transonic flight conditions, the buffet caused by interaction between shock waves and boundary layers can degrade an aircraft’s aerodynamic performance even threaten its safety. In this paper, control bumps, originally designed to reduce wave drag at cruise speeds, are applied enhance robustness of closed-loop system using trailing-edge flap. For OAT15A supercritical airfoil, a is first with...