Download Adaptive Moving Mesh Methods by Weizhang Huang PDF

By Weizhang Huang

Moving mesh tools are an efficient, mesh-adaptation-based procedure for the numerical resolution of mathematical types of actual phenomena. presently there exist 3 major options for mesh variation, specifically, to take advantage of mesh subdivision, neighborhood excessive order approximation (sometimes mixed with mesh subdivision), and mesh move. The latter kind of adaptive mesh process has been much less good studied, either computationally and theoretically.

This publication is set adaptive mesh new release and relocating mesh tools for the numerical answer of time-dependent partial differential equations. It offers a common framework and conception for adaptive mesh new release and provides a entire therapy of relocating mesh tools and their simple elements, in addition to their program for a couple of nontrivial actual difficulties. Many specific examples with computed figures illustrate many of the equipment and the results of parameter offerings for these tools. The partial differential equations thought of are often parabolic (diffusion-dominated, instead of convection-dominated).

The large bibliography presents a useful consultant to the literature during this box. every one bankruptcy includes worthwhile workouts. Graduate scholars, researchers and practitioners operating during this quarter will reap the benefits of this book.

Weizhang Huang is a Professor within the division of arithmetic on the collage of Kansas.

Robert D. Russell is a Professor within the division of arithmetic at Simon Fraser University.

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Note that while the formulation of a mesh movement strategy is independent of the type of the physical PDE to be solved, the discretization method and solution strategy are not. A variational approach is perhaps the most natural one for formulating elliptic or parabolic PDE based mesh generators. ) For this approach, mesh equations are defined as the Euler-Lagrange equations of a functional specially designed for the purpose of mesh adaptation. A number of adaptation functionals have been developed in the past based on error estimates and geometric considerations.

X ρ(x,t) = 0, ∂ξ ∂ξ x(0,t) = a, x(1,t) = b. 37) However, there are several advantages to employing a PDE that explicitly involves the mesh speed. 36) produces a system of algebraic equations. 3, the former leads to a system of ODEs and the latter to a system of DAEs (differential-algebraic equations). It is known that an ODE system is often easier to integrate than a system of differential-algebraic equations. Moreover, introduction of mesh speed into the mesh equation provides a degree of temporal smoothing for mesh movement, which is necessary for accurate integration of many physical PDEs.

Winslow [342] proposes to generate adaptive meshes through a variable diffusion model. The idea is generalized by Brackbill and Saltzman [58], who combine functionals representing mesh adaptivity, smoothness, and orthogonality. This is further modified by Brackbill [57] to include directional control in mesh adaptation and to require the terms contained in the functional to be dimensionally homogeneous. The method of Dorfi and Drury [124] is linked to a functional associated with the wellknown equidistribution principle [115, 186] while that of Dvinsky [129] is based on the energy of a harmonic mapping for mesh adaptation.

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