This paper discusses techniques for simulation based optimisation of marine current turbines, and the relative benefits and disadvantages of such methods. Blade Element Momentum codes, Computational Fluid Dynamics and Finite Element analyses, and subsequently the coupling of such techniques, are considered. The relevancy of design, search and optimisation with respect to complex fluid and struc...

Multi-bladed windmills usually pump water for agriculture and domestic consumption, often in remote locations. Although they have been around over 150 years, their aerodynamic performance is still poorly understood. This paper describes the use of helical vortex theory (HVT) blade element momentum (BEM) analysis to predict windmill thrust, torque, extracted power. We emphasize unusual features ...

Diffuser augmented wind turbines (DAWTs) can increase mass flow through the rotor substantially, but have often failed to fulfill expectations. We address high-performance diffusers, and investigate the design requirements for a DAWT rotor to efficiently convert the available energy to shaft energy. Several factors can induce wake stall scenarios causing significant energy loss. The causality b...

Alexander Phillips1, Stephen R. Turnock1, Maaten Furlong2 1 School of Engineering Sciences, University of Southampton 2National Oceanography Centre, Southampton Abstract The use of an unsteady Computational Fluid Dynamic analysis of the manoeuvring performance of a self-propelled ship requires a large computational resource that restricts its use as part of a ship design process. A method is pr...

This paper provides an investigation into the in uence of wake and skew on a ship propeller performance, based on the potential Boundary Element Method (BEM). Two types of in ow wake from a ship (i.e. Seiun-Maru and MS689) have been investigated for two propeller types; a Conventional Propeller (CP) and a Highly Skewed Propeller (HSP). The computed results include pressure distribution, open wa...

Abstract. We present an analytical model for assessing the aerodynamic performance of a wind turbine rotor through different parametrization classical blade element momentum (BEM) model. The is named Radially Independent Actuator Disc (RIAD) model, and it establishes relationship between local thrust loading power, known as local-thrust coefficient local-power respectively. has direct physical ...

Blade element momentum methods are widely used for initial aerodynamic analysis of propellers and wind turbines. A wide variety correction exist, but common to all variations, a pair residuals converged ensure compatibility between the two theories. This paper shows how rearrange sequence calculations reducing single residual. yields significant advantage that convergence can be guaranteed mach...

The shape of wake behind a wind turbine is normally assumed to have a hat shape for the models used in wind farm layout optimization purposes; however, it is know from experimental tests and numerical simulations that this is not a real assumption. In reality, the results of actual measurements and detailed numerical simulation show that the velocity in wake region has a S-shape profile. The pr...

The main purpose of this article is the structural analysis of a composite blade of a selected helicopter. In this study, the stresses on rotors' blades caused by centrifugal forces, lift, drag and torque are analyzed. The governing equations of the structure behavior and solving processes were carried out by MATLAB software, and simulation is carried out by ABAQUS software, and they are compar...