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Linear

By Rolf Rannacher (auth.), Erwin Stein (eds.)

ISBN-10: 3211269754

ISBN-13: 9783211269756

ISBN-10: 3211380604

ISBN-13: 9783211380604

This direction with 6 academics intends to give a scientific survey of modern re­ seek result of recognized scientists on error-controlled adaptive finite aspect equipment in reliable and structural mechanics with emphasis to problem-dependent innovations for adaptivity, mistakes research in addition to h- and p-adaptive refinement options together with meshing and remeshing. tough functions are of equivalent value, together with elastic and elastoplastic deformations of solids, con­ tact difficulties and thin-walled constructions. a few significant issues will be mentioned, specifically: (i) The becoming significance of goal-oriented and native mistakes estimates for quan­ tities of interest—in comparability with worldwide mistakes estimates—based on twin finite point suggestions; (a) the significance of the p-version of the finite point approach along with parameter-dependent hierarchical approximations of the mathematical version, for instance in boundary layers of elastic plates; (Hi) the alternative of problem-oriented blunders measures in compatible norms, reflect on­ ing residual, averaging and hierarchical errors estimates together with the potency of the linked adaptive computations; (iv) the significance of implicit neighborhood postprocessing with greater try out areas in an effort to get constant-free, i. e. absolute-not simply relative-discretizati- errors estimates; (v) The coupling of error-controlled adaptive discretizations and the mathemat­ ical modeling in similar subdomains, comparable to boundary layers. the most pursuits of adaptivity are reliability and potency, mixed with in­ sight and entry to controls that are self reliant of the utilized discretization equipment. by means of those efforts, new paradigms in Computational Mechanics can be learned, specifically verifications or even validations of engineering models.

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5)^ and inflow data g(x,0) = 0, g{0,y) = 1. The quantity to be computed is part of the outflow as indicated in Figure 10: • / ( « ) = / p nuds. The mesh refinement is organized according to ihQ fixed fraction strategy described above. In Table 5, we show results for this test computation. The corresponding meshes and the primal as well as the dual solution are presented in Figure 10. Notice that there is no mesh refinement enforced along the upper line of discontinuity of the dual solution since here the residual of the primal solution is almost zero.

This is a rather frequent case if one wants to compare the outcome of a simulation with measurements. 5)(ijc, with X = {(j), \|/}. 2 as in the initial distribution. The solution w* of the corresponding dual problem is shown in Figure 16 on the left. e. 5}, serves as source term for the dual solution. The dual solution therefore is discontinuous due to the discontinuous integral kernel. Duality Techniques for Error Estimation and Mesh Adaptation.. 43 Figure 16. Example 1. Left: primal solution u and dual solution w*.

V-u ^ 0. y5'wr^ variable p = —KV-u. For the resulting mixed formulation of the problem a result analogous to Proposition 6 holds true (Rannacher and Suttmeier (1999)). R. Rannacher 38 + + + ++ as (34 aj «6 ai ^ ^ ^ 3 '«2 Figure 13. Geometry of the elasto-§lastic benchmark problem and plot of |a^| (plastic region black, transition zone white) computed on a mesh with A^ ^ 10,000 cells. The result of this test is summarized in Figure 14. We see that the weighted a posteriori error estimate leads to more economical meshes, particularly if high accuracy is required.

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Adaptive Finite Elements in Linear and Nonlinear Solid and Structural Mechanics by Rolf Rannacher (auth.), Erwin Stein (eds.)


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