Current Issue : April - June Volume : 2018 Issue Number : 2 Articles : 5 Articles
Hydrodynamic forces on a structure are the manifestation of fluid-structure interaction. Since this interaction is nonlinear, these\nforces consist of various frequencies: fundamental, harmonics, excitation, sum, and difference of these frequencies. To analyze this\nphenomenon, we performnumerical simulations of the flow past stationary and oscillating cylinders at low Reynolds numbers.We\ncompute the pressure, integrate it over the surface, and obtain the lift and drag coefficients for the two configurations: stationary and\ntransversely oscillating cylinders. Higher-order spectral analysis is performed to investigate the nonlinear interaction between the\nforces. We confirmed and investigated the quadratic coupling between the lift and drag coefficients and their phase relationship.\nWe identify additional frequencies and their corresponding energy present in the flow field that appear as the manifestation of\nquadratic nonlinear interaction....
With respect to the multiattribute decision-making (MADM) problem in which the attributes have interdependent or interactive\nphenomena under the interval-valued intuitionistic fuzzy environment, we propose a group decision-making approach based on\nthe interval-valued intuitionistic fuzzy Einstein geometric Choquet integral operator (IVIFEGC). Firstly, the Einstein operational\nlaws and some basic principle on interval-valued intuitionistic fuzzy sets are introduced. Then, the IVIFEGC is developed and some\ndesirable properties of the operator are studied. Further, an approach tomultiattribute group decision-making with interval-valued\nintuitionistic fuzzy information is developed, where the attributes have interdependent phenomena. Finally, an illustrative example\nis used to illustrate the developed approach....
Mixed convection flow through a rectangular duct with at least one of the sides of the walls of the rectangle being isothermal under\nthe influence of transversely applied magnetic field has been analyzed numerically in this study.Thegoverning differential equations\nof the problem have been transformed into a system of nondimensional differential equations and then solved numerically. The\ndimensionless velocity, microrotation components, and temperature profiles are displayed graphically showing the effects of various\nvalues of the parameters present in the problem. The results showed that the flow field is notably influenced by the considered\nparameters. It is found that increasing the aspect ratio increases flow reversal, commencement of the flow reversal is observed after\nsome critical value, and the applied magnetic field increases the flow reversal in addition to flow retardation. The microrotation\ncomponents flow in opposite direction; also it is found that one component of the microrotation will show no rotational effect\naround the center of the duct....
This paper presents in detail the extension of the T-Ã?© formulation for eddy currents based on higher-order hierarchical basis functions so that it can automatically deal with conductors of arbitrary topology. To this aim, we supplement the classical hierarchical basis functions with nonlocal basis functions spanning the first de Rham cohomology group of the insulating region. Such nonlocal basis functions may be efficiently and automatically found in negligible time with the recently introduced DÃ?â??otkoââ?¬â??Specogna (DS) algorithm. The approach presented in this paper merges techniques together which to some extent already existed in literature but they were never grouped together and tested as a single unit....
Conflict management in Dempster-Shafer theory (D-S theory) is a hot topic in information fusion. In this paper, a novel weighted\nevidence combination rule based on evidence distance and uncertainty measure is proposed. The proposed approach consists of\ntwo steps. First, the weight is determined based on the evidence distance. Then, the weight value obtained in first step is modified by\ntaking advantage of uncertainty. Our proposed method can efficiently handle high conflicting evidences with better performance\nof convergence. A numerical example and an application based on sensor fusion in fault diagnosis are given to demonstrate the\nefficiency of our proposed method....
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