A highly nonlinear photonic crystal fiber with eight ring octagonal structure is proposed. Chalcogenide glass of As2S3 is used as the material for this photonic crystal fiber structure. The finiteelement method with perfectly matched boundary layer is employed to analyze the guiding properties. Non linearity of 13,584.5 per W-km is obtained at 1.55 μm with reasonable flattened dispersion of -25...

An eigenfunction-matching method is developed for the problem of linear water-wave scattering by a circular floating porous elastic plate, and a coupled boundary-element and finiteelement method is developed for the problem in which the plate is of arbitrary shape. The methods are shown to produce the same solutions for a circular plate, and their convergence properties are established. The imp...

Abstract: Many interesting tasks in technology need the solution of complex boundary value problems modeled by the mathematical theory of elasticity and elastoplasticity. Error controlled adaptive strategies should be used in order to achieve a prescribed accuracy of the computed solutions at minimum cost. In this paper, locally computed residual error indicators in the primal form of the finit...

In this article, a novel method to detect the partial demagnetization in air-cored permanent-magnet axial-flux generators is proposed. Its principle monitor speed-normalized fault detection signal. This signal depends only on severity, as it was extracted using flux-sensor with span that negates induced voltage under balanced conditions. The generator has been designed for marine renewable appl...

We use Fourier analysis to investigate the instability of an equal-order mixed nite element approximation method for elliptic incompressible ow equations. The lack of stability can be attributed to the fact that the associated discrete LBB (Ladyzhenskaya-Babu ska-Brezzi) constant tends to zero as the mesh size is reduced. We develop a stabilisation approach that is appropriate to the periodic s...

In electric power steering (EPS), spoke type brushless ac (BLAC) motors offer distinct advantages over other electric motor types in terms of torque smoothness, reliability and efficiency. This paper deals with the shape optimization of spoke type BLAC motor, in order to minimization cogging torque. In this paper examines, 3 step skewing rotor angle, optimizing rotor core edge and rotor overlap...

We review the fundamental modeling and numerical simulation for a prediction of fiber orientation during injection molding process of polymer composite. In general, the simulation of fiber orientation involves coupled analysis of flow, temperature, moving free surface, and fiber kinematics. For the governing equation of the flow, Hele-Shaw flow model along with the generalized Newtonian constit...

This paper provides a consistent set of flexible tools to approximate important geometric attributes, including normal vectors and curvatures, on arbitrary 2D and 3D meshes embedded in n dimensions. We present a consistent derivation of these first and second order differential properties using Voronoi cells and the mixed FiniteElement/Finite-Volume method. The new operators are closely related...

We are concerned with the steady flow of a conducting fluid, confined to a bounded region of space and driven by a combination of body forces, externally generated magnetic fields, and currents entering and leaving the fluid through electrodes attached to the surface. The flow is governed by the Navier–Stokes equations (in the fluid region) and Maxwell’s equations (in all of space), coupled via...

We present an output-based mesh adaptation strategy for Navier-Stokes simulations on deforming domains. The equations are solved with an arbitrary Lagrangian-Eulerian (ALE) approach, using a discontinuous Galerkin finiteelement discretization in both space and time. Discrete unsteady adjoint solutions, derived for both the state and the geometric conservation law, provide output error estimates...