Sensitive Analysis of the Static Response of Compliant Vertical Access Risers

Compliant vertical access risers (CVARs) are considered as efficient and robust alternative options to achieve cost efficiency safety. Design uncertainties emerge owing the limited understanding of effects various parameters related structural properties marine loads. In this paper, a reasonable three-dimensional (3D) numerical model CVAR with internal flow is presented based on slender rod theory. Accordingly, finite element method combined Newton-Raphson scheme employed discretize solve equations. A sensitivity analysis performed investigate influence external load static behavior CVAR. The weight length respective functional segments unchanged wet analyzed compared. results indicate that lengths buoyancy affect not only bending moment extremums effective tension but also extremum locations moment. Moreover, an increase in per unit these leads overall deformation sensitive current velocity along y-direction. However, large responses easily provoked by x-direction. This true for riser induced vessel motion