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International Journal of Fluid Mechanics Research

Publication de 6  numéros par an

ISSN Imprimer: 2152-5102

ISSN En ligne: 2152-5110

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: 1.1 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 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: 0.0002 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: 0.33 SJR: 0.256 SNIP: 0.49 CiteScore™:: 2.4 H-Index: 23

Indexed in

Local Stretching Maps: an Application for an Advection Problem in an Arbitrary Velocity Field

Volume 29, Numéro 1, 2002, 22 pages
DOI: 10.1615/InterJFluidMechRes.v29.i1.60
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RÉSUMÉ

The local stirring properties of a passive fluid domain with arbitrary borders in known velocity field are discussed. Analytical solution for local stretching permits to single out an exponential coefficient that describes stretching of the domain studied and is analogous to the largest Lyapunov's exponent used in chaotic dynamics. This coefficient exists in all solutions; it does not depend on the shape of the contour, and is determined by the gradients of the velocity field components only. Another local mechanism of stirring is determined by integral characteristics of the flow and the shape of the contour under consideration. Construction of maps for local stretching values in fixed moments allows to analyze informatively an evolution of regions, in which an intensive stirring takes place. The stirring process is explored in a sample of an advection problem of a passive impurity in the velocity field induced by a system of point vortices moved periodically. This interaction regime generates a chaotic motion of passive fluid particles. Local stretching maps show that the regions of chaotic motion of fluid particles and of intensive stirring do not coincide. Chaotic region has a zone of weak stirring, in which contours are transported from one intensive stretching zone to another without any deformation.

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