Advanced Computational Methods in Science and Engineering by Barry Koren, Kees Vuik PDF

By Barry Koren, Kees Vuik

ISBN-10: 3642033431

ISBN-13: 9783642033438

The target of the current booklet is to teach, in a vast and but deep manner, the cutting-edge in computational technological know-how and engineering. Examples of issues addressed are: speedy and exact numerical algorithms, model-order relief, grid computing, immersed-boundary equipment, and particular computational equipment for simulating a large choice of not easy difficulties, difficulties akin to: fluid-structure interplay, turbulent flames, bone-fracture therapeutic, micro-electro-mechanical platforms, failure of composite fabrics, typhoon surges, particulate flows, and so forth. the most profit provided to readers of the e-book is a well-balanced, updated evaluation over the sector of computational technology and engineering, via in-depth articles via experts from the separate disciplines.

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Eventually, this does not result in an O(N) iterative method. In addition to this feature, the Helmholtz equation also suffers from its coarsegrid correction components. Eigenvalues close to the origin may undergo a sign change after discretization on a coarser grid. If a sign change occurs, the coarse-grid solution does not give a convergence acceleration but gives a severe convergence degradation (or even divergence) instead. In [14] this phenomenon is analyzed and a remedy for the coarse-grid correction related to these problematic eigenvalues is proposed.

With these weights, we can form the coarse-to-fine transfer matrix, W , from which we can express the overall prolongation matrix, IHh , as IHh = W . W. Oosterlee, C. A. -E. Plessix We stress that while we only investigate the use of this interpolation for structured grids in this work, the use of these multigrid components enable the solution of unstructured-grid Helmholtz problems. 4 Numerical experiments In this section, we perform several numerical 2D experiments of increasing complexity. We start with the constant wavenumber problem, which serves as a benchmark for the algorithmic choices, after which we evaluate the method’s performance for a Helmholtz problem with a wedge heterogeneity, and a model of the Sigsbee field.

6135. Figure 11 presents the solution of this Helmholtz problem, where the fourth-order discretization is used. 5. This convergence is highly satisfactory. 5, the multigrid V(1,1)-cycle preconditioner, point-wise Jacobi smoothing and de Zeeuw’s interpolation needed 216 iterations and 237 seconds CPU time. Fig. 10 Domain for the scaled Sigsbee problem and the distribution of velocity, c(x), and wavenumber, k. (a) Speed of sound, c(x) for Sigsbee scaled domain (b) Distribution of k Shifted-Laplacian Preconditioners for Heterogeneous Helmholtz Problems 43 Fig.

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Advanced Computational Methods in Science and Engineering (Lecture Notes in Computational Science and Engineering) by Barry Koren, Kees Vuik


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