Efficient design of electromagnetic devices requires the analysis of electric and magnetic field distributions. To this end, the boundary element method (BEM) has been shown to be a powerful technique. This paper presents the use of BEM in computer-aided magnetic field analysis. The advantages of BEM over the finite element method (FEM) are stated. The recent introduction of BEM in a generalize...

We report on the results of an EIT phantom study using an experimental tank with agar conductivity inhomogeneities, used to verify the accuracy of both a boundary element method (BEM) forward model and a non-linear inverse solution based on the BEM model. We introduce the shunt electrode model into the BEM equations for greater accuracy and derive the associated Jacobian for the inverse problem...

In this paper it is attempted to investigate the behavior of an inviscid flow in the meridional plane of an axial flow compressor. For this purpose the 3-D unsteady Euler equations in cylindrical coordinate are averaged in tangential direction. Therefore, the equations are reduced to a 2-D system. By averaging the tangential component of momentum equation, a blade force will result. Axial and r...

this paper presents a hybrid method for the optimization of forging process of an aerofoil blade. preform shape and die parting-line angle are optimized in order to minimize the volume of the unfilled die cavity, material waste, forging forces. the overall optimization scheme used in this research work includes a multi-objective approach that is combination of response surface and finite elemen...

An advanced boundary element method (BEM) with thin-body capabilities was developed recently for the study of interphases in ®ber-reinforced composite materials (Y.J. Liu, N. Xu and J.F. Luo, Modeling of interphases in ®berreinforced composites under transverse loading using the boundary element method, ASME J. Appl. Mech. 67 (2000) 41±49). In this BEM approach, the interphases are modeled as t...

Boundary element methods (BEM) are used for forward computation of bioelectromagnetic fields in multi-compartment volume conductor models. Most BEM approaches assume that each compartment is in contact with at most one external compartment. In this work, I present a general surface integral equation and BEM discretization that remove this limitation and allow BEM modeling of general piecewise-h...

This study presents a parameterization of the interaction between wind turbines and the atmosphere and estimates the global and regional atmospheric energy losses due to such interactions. The parameterization is based on the Blade Element Momentum theory, which calculates forces on turbine blades. Should wind supply the world’s energy needs, this parameterization estimates energy loss in the l...

This paper presents the aerodynamic design of low noise wind turbine blades using Betz and Joukowski concepts. The aerodynamic model is based on Blade Element Momentum theory whereas the aeroacoustic prediction model is based on the BPM model. The investigation is started with a 3MW baseline/reference turbine rotor with a diameter of 80 m. To reduce the noise emission from the baseline rotor, t...

Abstract. In typical industrial practice based on IEC standards, wind turbine simulations are computed in the time domain for each mean speed bin using a few unsteady seeds. Software such as FAST, BLADED, or HAWC2 can be used to capture unsteadiness and uncertainties of simulations. The statistics these aeroelastic simulation outputs extracted calculate fatigue extreme loads components. minimum...

Wake models based on Actuator Disk theory are usually applied to optimize the wind farm layouts and improve their overall efficiency expected AEP. Despite effectiveness of existing models, most approaches flow axisymmetric assumption, without considering ground effect wake behavior. However, it has been shown that mast’s height, or distance from turbine ground, an influence expansion both hub’s...