Fairings – Patented Standard and ROV-Friendly ADFS
The patented AIMS Dual-finned Flow Splitter (ADFS) fairings are used to suppress vortex-induced vibrations in any region of a steel catenary riser (SCR), drilling riser, or structural tendons. The ADFS is an alternative to the conventional “tear-dropped” fairing and is more stable and efficient at reducing drag and vortex induced vibration (VIV).
Our ADFS suppression devices have been tested to high Reynolds Numbers showing a 95 percent efficiency (or higher) while possessing a very low drag coefficient. All of AIMS’ VIV suppression product designs are backed by full scale tank testing with Reynolds Numbers (Re) ranging from the low 1,000s to above 2,000,000. AIMS’ 3D matrices have been introduced into the SHEAR7 program for utilization by riser designers.
Our material of construction, molded polyethylene, allows good manufacturing tolerances and repeatability, low drag coefficients, and high efficiency in VIV elimination. Other materials can be used upon request. Furthermore, AIMS can also coat the strakes to achieve Antifouling characteristics if desired.
AIMS standard design employs a 1.75 D aspect ratio and is 72” tall. Other designs can be manufactured upon request. AIMS has test data showing the change in drag and VIV with a reduction of the aspect ratio down to 1.5D.
The VIV Suppression Efficiency of AIMS fairings (ADFS) is95 percent or greater. Our average Drag Coefficient, cd, is 0.45.