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.
Vortex induced vibration analysis - Vivana
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 amplitudes are calculated at the discrete frequencies by the frequency response method
The excitation 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 software 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
Learn more about Sesam software for moorings and risers
Have a look at our brochure, videos and other information

Sesam for moorings and risers brochure
Download a pdf

Sesam Feature Description
Download the pdf for more details

Sesam for moorings and risers modules
Read more about the software modules

Sesam Assistance
Are you using Sesam to its full potential?
Sesam for mooring and risers
Read more about the software
Sesam Examples
Examples of use for the Sesam software suite
Find out more
Get in touch with us or sign up for events and training
Customer login
Get access to downloads, release notes and FAQs
FAQ
Frequently asked questions - Sesam
Software events
Sign up for our events and seminars
Customer cases
Find out why industry leaders choose Sesam software
Sesam training
Training overview and registration