Computing with HP-Adaptive Finite Elements.: Volume II, by Leszek Demkowicz, Jason Kurtz, David Pardo, Maciej

By Leszek Demkowicz, Jason Kurtz, David Pardo, Maciej Paszynski, Waldemar Rachowicz, Adam Zdunek

Divided into sections, this ebook makes a speciality of the basics of 3-dimensional idea of HP equipment and implementation concerns. It provides a number of purposes that replicate numerous tasks for which the three-d HP code has been used over the years.

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By Leszek Demkowicz, Jason Kurtz, David Pardo, Maciej Paszynski, Waldemar Rachowicz, Adam Zdunek

Divided into sections, this ebook makes a speciality of the basics of 3-dimensional idea of HP equipment and implementation concerns. It provides a number of purposes that replicate numerous tasks for which the three-d HP code has been used over the years.

Show description

Read Online or Download Computing with HP-Adaptive Finite Elements.: Volume II, Frontiers three dimensional elliptic and maxwell problems with applications PDF

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Extra resources for Computing with HP-Adaptive Finite Elements.: Volume II, Frontiers three dimensional elliptic and maxwell problems with applications

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In general, we do not deal with polynomials anymore. In order to preserve the exact sequence property, P1: Binaya Dash/Subir Saha September 4, 2007 17:7 C6722 C6722˙Book 38 Computing with hp-ADAPTIVE FINITE ELEMENTS we have to define the H(curl)-, H(div)-, and L 2 -conforming elements consistently with the transformation rules for the differential operators. 25) In turn, for the curl operator we have ijk ∂E k = ∂xj ijk ∂ ∂xj Eˆ l ∂ξl ∂ xk = ijk ∂Eˆ l ∂ξl + Eˆ l ∂ x j ∂ xk ijk ∂ 2 ξl = ∂ xk ∂ x j ijk ∂Eˆ l ∂ξm ∂ξl ∂ξm ∂ x j ∂ xk =0 But ijk ∂ξm ∂ξl = J −1 ∂ x j ∂ xk nml ∂ xi ∂ξn where J −1 is the inverse jacobian.

The key point behind the construction presented by Zaglmayr in [175] is the concept of the parametric element. 28) 1 − z          z=ζ ζ = z All four top vertices of the hexahedron are mapped into the single top vertex of the pyramid. The pyramid spaces of shape functions can now be defined ‡ Note that general quadrilaterals or hexahedra with straight edges are not affine elements. 1 Master pyramid. Construction of Zaglmayr. either in terms of coordinates x, y, z or coordinates ξ, η, ζ .

The second equation expresses the continuity of stresses: the normal elastic stress must be equal to the (negative) pressure, whereas the tangential component of the elastic stress vector is set to zero, P1: Binaya Dash/Subir Saha September 4, 2007 17:7 C6722 20 C6722˙Book Computing with hp-ADAPTIVE FINITE ELEMENTS since the fluid does not support a shear stress. As usual, ω is the angular frequency, i is the imaginary unit, ρ f stands for the density of the fluid, and ni denotes the components of a unit vector normal to interface I which we will assume to be directed from the elastic into the acoustical subdomain.

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