Computational and experimental investigation of flow over a transient pitching hydrofoil

DSpace Repository

Show simple item record

dc.contributor.author DUCOIN, Antoine
ensam.hal.laboratories
  13094 Institut de Recherche de l'Ecole Navale (EA 3634) [IRENAV]
dc.contributor.author DENISET, François
ensam.hal.laboratories
  13094 Institut de Recherche de l'Ecole Navale (EA 3634) [IRENAV]
dc.contributor.author ASTOLFI, Jacques Andre
ensam.hal.laboratories
  13094 Institut de Recherche de l'Ecole Navale (EA 3634) [IRENAV]
dc.contributor.author SIGRIST, Jean-François
ensam.hal.laboratories
  12568 Laboratoire de Mécanique des Structures et des Systèmes Couplés [LMSSC]
dc.date.accessioned 2015-09-28T15:44:48Z
dc.date.available 2015-09-28T15:44:48Z
dc.date.issued 2009-06-03
dc.date.submitted 2015-09-28T10:05:29Z
dc.identifier.uri http://hdl.handle.net/10985/10205
dc.description.abstract The present study is developed within the framework of marine structure design operating in transient regimes. It deals with an experimental and numerical investigation of the time–space distribution of the wall-pressure field on a NACA66 hydrofoil undergoing a transient up-and-down pitching motion from 0 to 15 at four pitching velocities and a Reynolds number Re¼ 0.75 106. The experimental investigation is performed using an array of wall-pressure transducers located on the suction side and by means of time–frequency analysis and Empirical Modal Decomposition method. The numerical study is conducted for the same flow conditions. It is based on a 2D RANS code including mesh reconstruction and an ALE formulation in order to take into account the foil rotation and the tunnel walls. Due to the moderate Reynolds number, a laminar to turbulent transition model was also activated. For the operating flow conditions of the study, experimental and numerical flow analysis revealed that the flow experiences complex boundary layer events as leading-edge laminar separation bubble, laminar to turbulent transition, trailing-edge separation and flow detachment at stall. Although the flow is relatively complex, the
calculated wall pressure shows a quite good agreement with the experiment provided that the mesh resolution and the temporal discretization are carefully selected depending on the pitching velocity. It is particularly shown that the general trend of the wall pressure (low frequency) is rather well predicted for the four pitching velocities with for instance a net inflection of the wall pressure when transition occurs.
The inflection zone is reduced as the pitching velocity increases and tends to disappear for the highest pitching velocity. Conversely, high frequency wall-pressure fluctuations observed experimentally are not captured by the RANS model. Based on the good agreement with experiment, the model is then used to investigate the effects of the pitching velocity on boundary layer events and on hydrodynamic loadings. It is shown that increasing the pitching velocity tends to delay the laminar-to-turbulence transition and even to suppress it for the highest pitching velocity during the pitch-up motion. It induces also an increase of the stall angle (compared to quasi-static one) and an increase of the hysteresis effect during pitch-down motion resulting to a significant increase of the hydrodynamic loading.
en
dc.description.sponsorship DCNS
dc.language.iso en
dc.publisher Elsevier
dc.rights Post-print
dc.subject Lifting bodies en
dc.subject Hydrodynamic loading en
dc.subject Transient regimes en
dc.subject Laminar to turbulent transition en
dc.title Computational and experimental investigation of flow over a transient pitching hydrofoil en
ensam.hal.id hal-01206317 *
ensam.hal.status accept *
dc.identifier.doi 10.1016/j.euromechflu.2009.06.001
dc.typdoc Articles dans des revues avec comité de lecture
dc.localisation Centre de Paris
dc.subject.hal Sciences de l'ingénieur: Mécanique: Mécanique des fluides
dc.subject.hal Sciences de l'ingénieur: Mécanique: Mécanique des structures
ensam.workflow.submissionConsumer updateMetadata *
ensam.audience Internationale
ensam.page 728-743
ensam.journal European journal of mechanics
ensam.volume 28
ensam.issue 6

Files in this item

 

This item appears in the following Collection(s)

Show simple item record

Search


Number of documents in SAM

  • 2890 references in SAM

Newsletter

My Account

Reporting Suite

Help