Investigation on Vortex Induced Oscillations and Helical Strakes Effectiveness at Very High Incidence Angles Event: Investigation on Vortex Induced Oscillations and Helical Strakes Effectiveness at Very High Incidence Angles Date: June 1999 Author: P. Simantiras, N. Willis The demand to develop steel catenary riser (SCR) technology for floating production systems requires the capability to predict and eventually reduce the vortex induced vibrations (VIV) of slender tubular structures when subjected to steady flows at high angles of incidence. The SCR looks to be a prime candidate for future deepwater developments, but the means of VIV suppression of such a structure within its other stringent design requirements is only in its development phase, particularly for harsh environments such as the Atlantic margin and West Africa. An in-house helical strake design has been developed to satisfy potential response mitigation requirements. A reduced scale model experimental programme has been undertaken, to better address the full scale open water test campaign, aimed to determine both the VIV response and the helical strakes effectiveness at very high incidence angles. The reduced scale tests were carried out by towing in a tank a 6 m long, 0.152 m diameter pipe model at different velocities and inclination angles. The full scale tests were carried out by towing in open water a 200 m long, 0.274 m diameter pipe model at different velocities and inclination angles. A description of the towing arrangement and relevant instrumentation of both the test programmes is given. If you would like a copy of this technical paper register to download it (pop-up form). Back to All Technical Papers Services Production & Export Riser Concept Engineering Steel Catenary Risers Top Tensioned Risers Hybrid Risers Flexible Pipes & Risers Corrosion Resistance and Composite Risers Subsea Jumper Spools Subsea Umbilicals Deep Sea Mining Integrity, Life Extension & Monitoring | 2H Offshore Riser Integrity & Life Extension Platform Well Integrity & Life Extension Subsea Wellhead System & Life Extension Machine Learning for Riser Engineering Projects Riser System Digital Twin Drilling Riser Management Riser Monitoring System Engineering Riser Inspection, Maintenance & Repair Anomaly & Incident Engineering Subsea Engineering & Assessment Services Component Detailed Design Offshore Decommissioning Engineering Fracture Mechanics and Engineering Critical Assessment Installation Engineering Mechanical Connectors Offshore Renewable Energy Systems and Qualification Testing System Verification & CVA Well Plug & Abandonment Drilling, Completion & Workover Drilling Risers Subsea Completion & Workover Risers Subsea Wellheads & Conductors Offshore Platform Conductors Well Engineering Minimum Facility Platform Design and Engineering Conductor Supported Wellhead Platforms & CoSMOS Monopile Wellhead Platforms Exploration to Early Production Systems Structural Engineering Services Riser Delivery Management & Systems Engineering Get the latest riser insights! Receive our riser news, published papers and blog posts in your inbox monthly. * This iframe contains the logic required to handle Ajax powered Gravity Forms.