Download PDF by Jose E. Castillo, Guillermo F. Miranda: Mimetic Discretization Methods

By Jose E. Castillo, Guillermo F. Miranda

ISBN-10: 1466513438

ISBN-13: 9781466513433

To support remedy actual and engineering difficulties, mimetic or appropriate algebraic discretization tools hire discrete constructs to imitate the continual identities and theorems present in vector calculus. Mimetic Discretization Methods specializes in the hot mimetic discretization approach co-developed by means of the 1st writer. in accordance with the Castillo-Grone operators, this easy mimetic discretization procedure is at all times legitimate for spatial dimensions no more than 3. The ebook additionally offers a numerical procedure for acquiring corresponding discrete operators that mimic the continuum differential and flux-integral operators, allowing a similar order of accuracy within the inside in addition to the area boundary.

After an outline of assorted mimetic ways and purposes, the textual content discusses using continuum mathematical types with the intention to encourage the normal use of mimetic tools. The authors additionally provide easy numerical research fabric, making the e-book compatible for a path on numerical equipment for fixing PDEs. The authors conceal mimetic differential operators in a single, , and 3 dimensions and supply an intensive advent to object-oriented programming and C++. moreover, they describe how their mimetic tools toolkit (MTK)—available online—can be used for the computational implementation of mimetic discretization equipment. The textual content concludes with the applying of mimetic the right way to established nonuniform meshes in addition to numerous case studies.

Compiling the authors’ many recommendations and effects constructed through the years, this e-book indicates tips to receive a powerful numerical resolution of PDEs utilizing the mimetic discretization process. It additionally is helping readers evaluate substitute equipment within the literature.

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Example text

The curl operator relates to the grad operator in several ways. 22) C for any closed curve C, implying that B E · dr. 23) A does not depend upon the path followed in order to go from A to B; therefore, a scalar-valued function U , called the potential for E, must exist, and it is defined at a variable point B for a fixed point A, by B E · dr. 24) A For such a conservative E: grad U (B) = E(B). 25) holds. 27) curl curl E ≡ 0. 28) and Physically, the curl of the fluid velocity field, called the vorticity of the corresponding fluid flow, is germane to the fluid’s viscosity properties.

However, if the fluid has no viscosity, then curl v = 0 in Ω, so that there exists some scalar-valued function U such that v = grad U ; therefore, ∇ · ∇U ≡ 0 in Ω, and U satisfies Laplace’s equation ∆ U = 0 in Ω, where ∆ = ∇ · ∇ is Laplace’s operator. If Ω is a 2-D region, then ∇ U (x, y) = Ux (x, y)i + Uy (x, y)y, so that we must have Laplace’s equation: ∇ · ∇ U (x, y) = ( ∂ ∂ Ux + Uy )(x, y) = (Uxx + Uyy )(x, y) ≡ 0 in Ω. 43) ∂x ∂y This allows us to establish a connection between scalar-valued functions U , thereby satisfying a 2-D Laplace’s equation, together with the associated vector velocity field v = grad U , and the analytic complex functions of a complex variable z = x + iy.

24) A For such a conservative E: grad U (B) = E(B). 25) holds. 27) curl curl E ≡ 0. 28) and Physically, the curl of the fluid velocity field, called the vorticity of the corresponding fluid flow, is germane to the fluid’s viscosity properties. 32) which clearly satisfies and so that, in this very simplified model of a vortex within an infinite fluid, we see that curl v has the direction of the axis of rotation, with a magnitude of twice the angular velocity ω. A more realistic model features a nonzero curl v (exemplified by a finite volume fluid), and is provided by an incompressible inviscid liquid mass which partially fills a vertical, cylindrical container, whose axis is coincident with the z-coordinate axis.

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Mimetic Discretization Methods by Jose E. Castillo, Guillermo F. Miranda

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