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International Journal for Multiscale Computational Engineering

Publicado 6 números por año

ISSN Imprimir: 1543-1649

ISSN En Línea: 1940-4352

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.4 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.3 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 2.2 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00034 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.46 SJR: 0.333 SNIP: 0.606 CiteScore™:: 3.1 H-Index: 31

Indexed in

A Fourier Spectral Solver for Confined Navier-Stokes Flow

Volumen 6, Edición 1, 2008, pp. 53-63
DOI: 10.1615/IntJMultCompEng.v6.i1.50
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SINOPSIS

No-slip boundaries have an important effect on forced and decaying two-dimensional turbulence due to their role as vorticity source. During intensive vortex-wall interactions high-amplitude vorticity filaments are produced. Most of these filaments roll up and form small-scale vortices that are advected into the interior by larger-scale vortices. From a computational point of view, it is a challenge to resolve the multiple temporal and spatial scales. Another challenge is to solve 2D turbulence in different geometries, e.g. square, triangle, circle, or ellipse. In this study we use a fast Fourier spectral technique to simulate the Navier-Stokes equations with no-slip boundary conditions. This is enforced by an immersed boundary technique called "volume penalization." The approach has been justified by analytical proofs of the convergence with respect to the penalization parameter. However, the solution of the penalized Navier-Stokes equations is not smooth on the surface of the penalized volume. Therefore, it is not a priori known whether it is possible to actually perform accurate fast Fourier spectral computations. Convergence checks are reported using a recently revived, and unexpectedly difficult, dipole-wall collision as a test case. It is found that Gibbs oscillations have a negligible effect on the flow evolution, also for 2D flows without the presence of reflection symmetry. Convergence results are reported of the angular momentum production by intensive flow-wall interaction.

CITADO POR
  1. Keetels G. H., Clercx H. J. H., van Heijst G. J. F., Spontaneous angular momentum generation of two-dimensional fluid flow in an elliptic geometry, Physical Review E, 78, 3, 2008. Crossref

  2. Keetels G.H., Clercx H.J.H., van Heijst G.J.F., Quasi-stationary states in a circular geometry, Physica D: Nonlinear Phenomena, 238, 14, 2009. Crossref

  3. Keetels G.H., Clercx H.J.H., van Heijst G.J.F., On the origin of spin-up processes in decaying two-dimensional turbulence, European Journal of Mechanics - B/Fluids, 29, 1, 2010. Crossref

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