The design of wind turbines requires a deep insight into their complex aerodynamics, such as dynamic stall single airfoil and flow vortices. calculation the aerodynamic forces on turbine blade at different angles attack (AOAs) is fundamental task in blades. accurate efficient (lift drag) prediction an are challenging tasks. Computational fluid dynamics (CFD) able to provide better understanding...

In this paper the effects of rigid triangular passive vortex generators on a  hydrofoil were investigated numerically.  In the first step using the Finite Volume Method the bare hydrofoil  were modeled and the results of lift and drag coefficients were validated using experimental data. In the next step the hydrofoil armed with vortex generators was modeled and its effect on the hydrofoil perfo...

Linear modal instabilities of flow over finite-span untapered wings have been investigated numerically at Reynolds number 400, a range angles attack and sweep on two having aspect ratios 4 8. Base flows generated by direct numerical simulation, marching the unsteady incompressible three-dimensional Navier-Stokes equations to steady state, or using selective frequency damping obtain stationary l...

In this paper we investigate the behavior of higher order Galerkin expansions of the Moore-Greitzer model of general transients in aeroengine compression systems. We assume steady state en-trainment of the higher Fourier modes of the rotating stall cell which establishes a framework for a simpli-ed numerical analysis of the bifurcating solutions corresponding to rotating stall. For small values...

The current study was carried out to determine the influence of different resting surfaces and stall types on milk yield and animal health. Study was carried out in Bursa that is one of the most important cities of Turkey in terms of dairy production. Effects of resting surfaces and stall types on milk yield were found to be important. Also influence of different resting surfaces and stall type...

Microprocessors commonly encounter data hazards that must be resolved by stalling the pipeline until all inputs become available. The stall is broadcast globally to previous stages so no tokens are lost. As propagation delays of cross-chip wires exceed 1 cycle, it is no longer possible to stop the processor “on a dime.” Local Stall Propagation is a systematic approach to solving the problem. In...

Adaptive closed-loop control is used to optimize the lift-to-drag ratio of post-stall separated flow over a NACA 0025 airfoil using multiple amplitudemodulated (AM) or burst-modulated (BM), zero-net-mass-flux (ZNMF) actuators that cover the central 33% span of the airfoil. A simplex optimization approach uses the lift and drag measured by a strain-gauge balance for feedback and searches for the...