Ever increasing demand of higher pressure ratio of aero-engine compressors has always been hindered by two distinct aerodynamic instabilities. The first known as surge is; large one dimensional periodic mass flow fluctuation through the compressor, which involves the entire pumping system including compressor, ducting, plenum and throttle. The second is the rotating stall which can be character...

The ability to control the flow of water around the body dictates the performance of marine mammals in the aquatic environment. Morphological specializations of marine mammals afford mechanisms for passive flow control. Aside from the design of the body, which minimizes drag, the morphology of the appendages provides hydrodynamic advantages with respect to drag, lift, thrust, and stall. The flu...

A fixed-wing aircraft that is capable of low airspeed, high angle of attack flight can serve an expanded range of mission goals. A typical propeller-driven small unmanned aircraft can be equipped with an engine that provides greater thrust than airplane weight; in post-stall states, the aircraft then depends on propeller backwash over the tail for control moment generation. Due to this dependen...

Dynamic stall on airfoils negatively impacts their aerodynamic performance and can lead to structural damage. Accurate prediction modelling of the dynamic loads are crucial for a more robust design wings blades that operate under unsteady conditions susceptible widening range operation these lifting surfaces. Many models rely empirical parameters need be obtained from experimental or numerical ...

Filopodia are thin cell extensions sensing the environment. They play an essential role during cell migration, cell-cell or cell-matrix adhesion, by initiating contacts and conveying signals to the cell cortex. Pathogenic microorganisms can hijack filopodia to invade cells by inducing their retraction towards the cell body. Because their dynamics depend on a discrete number of actin filaments, ...

Transfer of cattle to an unknown barn may result in a reduction in its welfare. Housing and management practices can result in signs of stress that include a long-term suppression of milk efficiency. The purpose of this study was to evaluate the influence of moving cows from the stanchion-stall housing to free-stall housing on their behaviour and production. The Holstein cows were moved into th...

This paper introduces the realization and wind tunnel testing of a novel variable camber wing equipped with compliant morphing trailing edges. Based on aerodynamic shape mechanisms that were optimized in advance, model called mTE4 was developed, which rigid leading edge, box, edge manufactured by 3D printing technology using three different materials. Due to difficulties detailed design small-s...

An experimental study is conducted to research the combined effect of leading-edge (LE) tubercles and internal slots on Clark-Y airfoil at Reynolds numbers (Re) 5.0×104, 7.5×104, 1.0×105 for angles attack ranging from 0° 30°. The a cambered that performs well low medium numbers, having maximum thickness 11.7% 28% chord. Five different test models are subjects experiments, one which baseline. ot...

In this paper, a numerical investigation into spike-type rotating stall process is carried out considering transonic compressor rotor (the NASA Rotor 37). Through solution of the Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations, evolution from an initially circumferentially-symmetric near-stall flow field to stable condition simulated without adding any artificial disturbance. At oper...

Aerodynamic performances may be optimised by the appropriate tuning of Active Flow Control (AFC) parameters. For first time, we couple Genetic Algorithms (GA) with an unsteady Reynolds-Averaged Navier-Stokes (RANS) solver using Spalart-Allmaras (SA) turbulence model to maximise lift and aerodynamic efficiency airfoil in stall conditions [1], then validate resulting set optimal Synthetic Jet Act...