Experiments in Fluids

, 59:28 | Cite as

Force-motion phase relations and aerodynamic performance of a plunging plate

  • Onur Son
  • Oksan Cetiner
Research Article


Due to the unsteady motion of a plunging plate, forces acting on the body experience a phase difference with respect to the motion. These phase relations are investigated experimentally for a harmonically plunging plate within an amplitude range of \(0.05\le {a/c}\le 0.6\), reduced frequency range of \(0.78<{k}<7.06\), and at a constant Reynolds number of 10,000. Both streamwise and cross-stream force components are found to have a phase lag following the motion; however, their variations are different. The phase lag of the force on the cross-stream direction increases as the amplitude increases. Drag–thrust transition has an influence on the streamwise force phase lags, which starts to increase when the thrust starts to be produced. Particle image velocimetry measurements are also performed to reveal the relations between vortex structures and force measurements. Leading edge vortex shedding characteristics are observed to be changing from drag occurring cases to thrust producing cases in parallel with the increment in phase lags.



The authors acknowledge the funding provided by the Scientific and Technological Research Council of Turkey (TUBITAK) Grant 112M682.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Astronautical EngineeringIstanbul Technical UniversityIstanbulTurkey

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