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VIV? PowerPoint Presentation

VIV?

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VIV?

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  1. Vortex Induced Vibration what is it? when does it occur? Relative Flow VIV?

  2. Atmospheric VIV - Guadeloupe

  3. Relative Flow Vortex Shedding Forces • Vortex shedding generates alternating forces • fv = (S.U)/d ~ 0.2.(U/d)

  4. Lock-On • What happens if fv = fn ? a/D 1 0 1 fv/fn

  5. Predicting VIV • Hand Calculation - Strouhal Analysis • Numerical Methods (OrcaFlex VIV Toolbox) • Frequency Domain (Shear7, VIVA) • Time Domain (Wake Oscillators, Vortex Tracking) • CFD (including structural model)