A combined multi-mode response is also reported. Results are reported in spreadsheet form for each single excited mode of vibration. This allows a riser model to be built in OrcaFlex, taking advantage of the usual user interface, and analysed by VIVA (which carries out a frequency domain calculation of VIV response based on an energy balance). As part of the project, an interface has been written between OrcaFlex and VIVA. Orcina was a participating member of a joint industry project, started in 2000 and run by DTCEL and Prof.
M Triantafyllou at MIT and distributed by JD Marine (formerly DTCEL). VIVA is a frequency domain VIV prediction program developed by Prof.
