Current performance analysis processes for drag-dominant tidal turbines are unsuitable as disk actuator theory lacks support varying swept blockage area, bypass flow downstream interaction, and parasitic rotor drag, whereas blade element momentum is computably effective three-blade lift-dominated aerofoil. This study proposes a novel technique to calculate the optimal turbine tip speed ratio (T...

The dynamics of pectoral fin rowing in the threespine stickleback are investigated by measuring the instantaneous force balance on freely swimming fish throughout the stroke cycle and comparing the measured forces with fin motions and an unsteady, blade-element model of pectoral fin propulsion. Both measured and modeled forces suggest that attached vortex and circulatory forces and not inertial...

We analyze three-body decays of and . Under the factorization approach, there are tree level diagrams for these decay modes and the transition matrix element of decay is factorized into a form factor multiplied by decay constant and form factor multiplied into weak vertices form factor. The transition matrix element of decay is also factorized into a form factor multiplied into weak vertic...

We developed a computational model based on a finite-element mixed formulation with quadratic isoparametric beam elements. We applied this model to the analysis of a blade-wagon: a novel structure characteristic of an innovative concept in wind-power called VGOT Darrieus turbine. We studied the structural behaviour of its main components: chassis, suspension and blade, using combinations of bea...

The second part of this paper presents results of stress analysis of the whole Francis turbine runner at Derbendikan power station by using the Finite Element Method (FEM). Computations were carried out with appropriate boundary and loading conditions for water pressure obtained from CFD analysis. The analysis focuses on stress distribution in the runner blades. It has been found that the maxim...

The paper presents a numerical and experimental study of corona discharge for a blade -plate configuration. Finite element method (FEM) is used to determine the electric potential between the electrodes and charge conservation equation is solved by the method of characteristics (MOC) to determine the charge density. The structured mesh is redefined at each step of the iterative scheme, the node...

Abstract. In this work, a computationally efficient engineering model for the aerodynamics of swept wind turbine blades is proposed extended blade element momentum (BEM) formulation. The modified based on coupled near- and far-wake model, in which near wake assumed to be first quarter revolution non-expanding helical own blade. For special case in-plane trailed vorticity, original empirical equ...

Blade leading edge erosion is acknowledged to significantly reduce the energy yield of wind turbines. The problem particularly severe for offshore installations, due faster progression boosted by harsh environmental conditions. This study presents and demonstrates an experimentally validated simulation-based technology rapidly accurately estimating turbine losses general erosion. combines predi...

Horizontal axis wind turbines (HAWTs) experience yaw misalignments due to the physical limitations of controllers and various novel active controls. Moreover, motion floating offshore (FOWTs) accelerates misalignment. The blade element momentum (BEM) method is widely used its computational efficiency for design HAWTs. Momentum theory, basis BEM, assumes steady flow uniform induction field at di...

In the present study three dimensional steady state thermo-chemical simulation of a pultrusion process is investigated by using the finite element/nodal control volume (FE/NCV) technique. Pultrusion simulation of a composite having a C-shaped cross section is performed as a validation case. The obtained cure degree profiles for specific points match well with those in the literature. Following ...