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International Journal of Fluid Mechanics Research

Published 6 issues per year

ISSN Print: 2152-5102

ISSN Online: 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

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Explanation of Scatter Phenomenon in Wind-Tunnel Experiments for Airfoils at High Incidences by the Multi-Equilibrium States of Separated Flow

Volume 39, Issue 5, 2012, pp. 396-415
DOI: 10.1615/InterJFluidMechRes.v39.i5.30
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ABSTRACT

Coupled with k-ω SST turbulent model, the unsteady Reynolds-averaged Navier−Stokes equations are solved in the time-domain to obtain the steady and/or unsteady separated flow for airfoils at high incidences. Different kinds of vibrations are designed for the airfoils to simulate different disturbances. The effects of different disturbances on the separated flow are studied, especially at high incidences when the multi-equilibrium states phenomenon for the separated flow exists. It is found that, for the given Reynolds number and airfoils with thickness larger than 20 %, multi-equilibrium states exist for the separated flows around the airfoils, and the equilibrium state of the separated flow may transit under certain disturbances at some range of incidences. Generally, the plunging disturbance and pitching disturbance are more effective than the forward-backward disturbance in leading to the equilibrium state of the separated flow transiting from one state to another. The average aerodynamic force will change when the equilibrium state of the separated flow-field transit. These phenomena can be an explanation for the poor repeatability and scatter phenomenon of aerodynamic characteristics for configurations at high incidences in wind-tunnel experiments.

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