Drag reduction and VIV suppression behaviour of LGS technology integral to drilling riser buoyancy units

H. Marcollo, A. E. Potts, D. R. Johnstone, P. Pezet, P. Kurts

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

14 Citations (Scopus)


Drilling risers are regularly deployed in deep water (over 1500 m) with large sections covered in buoyancy modules. The smooth cylindrical shape of these modules can result in significant vortex-induced vibration (VIV) response, causing an overall amplification of drag experienced by the riser. Operations can be suspended due to the total drag adversely affecting top and bottom angles. Although suppression technologies exist to reduce VIV (such as helical strakes or fairings), and therefore reduce VIV-induced amplification of drag, only fairings are able to be installed onto buoyancy modules for practical reasons, and fairings themselves have significant penalties related to installation, removal, and reliability. An innovative solution has been developed to address this gap; LGS (Longitudinally Grooved Suppression)1. Two model testing campaigns were undertaken; small scale (sub-critical Reynolds Number flow), and large scale (post-critical Reynolds Number flow) to test and confirm the performance benefits of LGS. The testing campaigns found substantial benefits measured in hydrodynamic performance that will be realized when LGS modules are deployed by operators for deepwater drilling operations.

Original languageEnglish
Title of host publicationCFD and VIV
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791849934
Publication statusPublished - 2016
Externally publishedYes
EventInternational Conference on Ocean, Offshore and Arctic Engineering 2016 - Busan, Korea, South
Duration: 19 Jun 201624 Jun 2016
Conference number: 35th


ConferenceInternational Conference on Ocean, Offshore and Arctic Engineering 2016
Abbreviated titleOMAE 2016
Country/TerritoryKorea, South

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