Instabilities in the Wake of an Inclined Prolate Spheroid

Part of the Computational Methods in Applied Sciences book series (COMPUTMETHODS, volume 50)


We investigate the instabilities, bifurcations and transition in the wake behind a 45-degree inclined 6:1 prolate spheroid, through a series of direct numerical simulations (DNS) over a wide range of Reynolds numbers (Re) from 10 to 3000. We provide a detailed picture of how the originally symmetric and steady laminar wake at low Re gradually looses its symmetry and turns unsteady as Re is gradually increased. Several fascinating flow features have first been revealed and subsequently analysed, e.g. an asymmetric time-averaged flow field, a surprisingly strong side force etc. As the wake partially becomes turbulent, we investigate a dominating coherent wake structure, namely a helical vortex tube, inside of which a helical symmetry alteration scenario was recovered in the intermediate wake, together with self-similarity in the far wake.


Instability Prolate spheroid Wakes 



This work has been supported by the Research Council of Norway through a grant of computing time on the national HPC infrastructure (Programme for Supercomputing, projects nn9191 k and nn2469 k). F.J. acknowledges the funding from the Future Industry’s Leading Technology Development program (No. 10042430) of MOTIE/KEIT of Korea. V.L.O. acknowledges the Russian Science Foundation (grant no. 14-29-00093). We finally thank AIP Publishing and Cambridge University Press for permissions to reprint figure nos 15, 17, 20, and 21.


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Authors and Affiliations

  1. 1.Department of Energy and Process EngineeringNorwegian University of Science and Technology, (NTNU)TrondheimNorway
  2. 2.Department of Marine TechnologyNTNUTrondheimNorway
  3. 3.Department of Wind EnergyTechnical University of DenmarkLyngbyDenmark
  4. 4.Institute of Thermophysics, SB of RASNovosibirskRussia

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