Hydrodynamic Analysis Of Tension Leg Platform With Different Tendon Connection Angles

The hydrodynamic response of offshore floating bodies is very important for sustainability and proper functioning.It is important to understand how these bodies will react to the dynamic loadings they will face in the offshore environment.This paper aims to investigate the hydrodynamic behavior of a Tension Leg Platform when the tendon connection angles are varied at 90~o,70~o,50~o and 30~o.Three different types of loading conditions are applied to the Tension Leg Platform.The first conditions include 100-yr hurricane storm period.This loading includes irregular wave,current and wind loads.The second loading includes regular waves only and the third condition involves no loading.The third condition is used to test the natural motions of the Tension Leg Platform.The Tension Leg Platform displays major response in the pitch degree of freedom.A maximum reduction of 14%in pitch rotation is achieved when 100-yr hurricane storm conditions are applied to the Tension Leg Platform.This occurred in 0~o loadings at 30~o tendon connection angle as compared to 90~o tendon connection angle.Reduction in pitch rotation is also achieved in the regular wave loadings.A maximum of 9%in pitch rotation is achieved during 0~o wave loading at 30~o tendon connection angle as compared to 90~o.The Tension Leg Platform continues to display reduction in pitch motion as the tendon connection angle is varied from 90~o through 30~o for loading approach angles of 22.5~o and 45~o.When the tendon connection angle is reduced from 90~o to 30~o,the natural frequency of the Tension Leg Platform increased both in pitch and yaw degrees of freedom by 2.55%and 2.4%respectively.Sway,heave and roll motions were not investigated.Under loading,the Tension Leg Platform displayed minor changes in surge and yaw motions as the tendon connection angles were varied from 90~o through30~o.These changes were not considered.