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Fluid Structure 1

Location:

MD 259

Members of the lab:

Profs: M.P. Païdoussis, M. Amabili

Research Associate: Dr Christian Semler

Post-docs: Konstantinos Karagiozis, Hamid Ait Abderrahmane

Graduate students: James Wang, Mergen Hajghayesh, Stéphane Jamin, Ahmad Jamal, Mojtaba Kheiri, Mehdi Paak, Dana Giacobbi, Wensheng Zhao, Stephanie Rinaldi

Research Assistants: Ben Besner

Mission Statement:

The research undertaken in this laboratory is primarily concerned with fluid-structure interactions involving slender structures and axial flow, either internal or external. Experiments are concerned with the dynamics and particularly stability of structures (cylinders, pipes, cylindrical shells and plates) when subjected to internal, or external axial or annular flows. Of particular interest is the study of the nonlinear and chaotic dynamics of such interactions.

Apparatus:

  • A water tunnel with a vertical test-section, and 203 mm diameter; max. flow velocity: 6 m/s.
  • Two ad-hoc experimental set-ups for vibrations and stability of pipes conveying fluid.
  • Apparatus for testing the dynamics of shells with internal and/or annular flow.
  • Fotonic sensors, noncontacting optical motion sensor systems, Polytec Vibrascan system, accelerometers, B&K shakers, pressure transducers, FFT Analyzer, digital oscilloscope, etc.

Projects:

  • The nonlinear and chaotic dynamics of cantilevered pipes conveying fluid in the presence of intermediate elastic supports, end-masses and end-nozzles (Figure 1).
  • Dynamics of aspirating pipes.
  • Wave propagation in fluid-filled and fluid-conveying conduits.
  • The linear and nonlinear dynamics of solitary or clustered flexible cylinders (Figure 2) in axial flow.
  • The nonlinear dynamics and stability of cylindrical shells filled with quiescent or flowing fluid.
  • The nonlinear dynamics of cantilevered plates subjected to axial flow.

Figure 1. The pipe conveying fluid and typical bifurcation diagram near point of double degeneracy.


Figure 2. Cylinder cluster in axial flow; some modal patterns; theoretical and experimental PSDs compared.