DNV GL - Korea

Vortex induced vibration analysis - Vivana

Calculation of vortex induced vibrations (VIV) of slender marine structures such as risers, free span pipelines and cables subjected to ocean current.

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Vivana vortex induced vibration analysis software

The basis of Vivana

The hydrodynamic model in Vivana is based on empirical coefficients, while the structural model applies a non-linear 3-dimensional finite element formulation.

The program is able to work with an arbitrary distribution of tension, mass, stiffness, buoyancy and diameter.

Response frequencies are identified while considering a frequency dependent hydrodynamic mass along the structure.

Response aplitudes are calculated at the discrete frequencies by the frequency response method

The excitattion force model includes a lift coefficient that is a function of the response amplitude and the response frequency.

Damping outside the excitation zone is introduced by high and low velocity damping terms.

What will Vivana provide for the user

  • Free variation of all parameters (diameter, Strouhal number, coefficients etc.) along the riser
  • Frequency dependent hydrodynamic mass matrix
  • Identification of dominating and possible response frequencies
  • Identification of excitation and damping zones for all response frequencies
  • Calculation of response amplitude
  • Calculation of fatigue damage
  • Calculation of drag amplification