نتایج جستجو برای: unconventional difference method

تعداد نتایج: 1975858  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز 1379

برای استفاده از روش تفاضلهای محدود ‏‎(finite difference method)‎‏ در حل عددی معادلات حاکم بر جریانهای لزج با مرزهای پیچیده، معمولا این معادلات در یک دستگاه مختصات محاسباتی که منطبق بر مرزهاست نوشته میشوند. برای این منظور میبایست ابتدا شبکه ای که رابطه بین حوزه های فیزیکی و محاسباتی جریان را مشخص میکند، محاسبه شود. هدف از انجام این تحقیق تولید یک شبکه متعامد منطبق بر مرزها در حوزه جریان دو بعدی ...

2004
Frank Wijnands Hugo J. W. M. Hoekstra

A method is described to construct modal fields for an arbitrary oneor two-dimensional refractive index structure. An arbitrary starting field is propagated along a complex axis using the slowly varying envelope approximation (SVEA). By choosing suitable values for the step-size, one mode is maximally increased in amplitude on propagating, until convergence has been obtained. For the calculatio...

Journal: :I. J. Bifurcation and Chaos 2012
Changpin Li Fanhai Zeng

In this review paper, the finite difference methods (FDMs) for the fractional differential equations are displayed. The considered equations mainly include the fractional kinetic equations of diffusion or dispersion with time, space and time-space derivatives. In some way, these numerical methods have similar form as the case for classical equations, some of which can be seen as the generalizat...

2014
Ali Ghods Mahyar Mir

This paper presents an investigation into the performance evaluation of Finite Difference (FD) method in modeling a rectangular thin plate structure. In case of complex and big construction systems subjected to the arbitrary loads, including a complex boundary conditions, solving of differential equations by analytical methods is almost impossible. Then the solution is application of numerical ...

2010
Xin Wang Tim Warburton

Discontinuous Galerkin Time Domain Methods for Acoustics and Comparison with Finite Difference Time Domain Methods

2014
Laura Peralta Guillermo Rus-Carlborg Nicolas Bochud Juan Manuel Melchor Rodriguez Juan Chiachio Manuel Chiachio

The cervix is a biochemically active tissue that changes its biomechanical properties in a remodeling process during pregnancy to be prepared for parturition. This maturation process is associated with changes of the mechanical properties of the cervical stroma. Preterm delivery is connected with undesired cervical changes bound to cervical ripening. Non-destructive evaluation using ultrasonic ...

2000
Bart Denecker Frank Olyslager Luc Knockaert Daniël De Zutter

A new method combining a finite difference method and a reduced order model (ROM) algorithm is presented for twodimensional (2-D) electromagnetic problems. The problem space is subdivided into subdomains of a generic type. By discretizing the spatial derivatives in a way similar to the finite-difference in time-domain technique (FDTD), the state equations are written down in each subdomain. Fro...

2009
Carlos Spa Toni Mateos Adan Garriga

The space and time discretization inherent to all FDTD schemes introduce non-physical dispersion errors, i.e. deviations of the speed of sound from the theoretical value predicted by the governing Euler differential equations. A general methodology for computing this dispersion error via straightforward numerical simulations of the FDTD schemes is presented. The method is shown to provide remar...

Journal: :Scholarpedia 2011

Since the development bloom in unconventional reservoirs in North America, total organic carbon (TOC) has become a more essential parameter, as the indicator of the efficiency of these reservoirs. In this paper, by using conventional well logs and NMR log data, the TOC content of an unconventional reservoir in West Africa is estimated. Passy’s, Issler’s, and Schmoker’s methods were used as indi...

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