Several sources of nonlinearities are present in a catenary riser analysis, making it a very complex system to study. There are different configurations of risers, among them vertical, catenary, lazy-wave and steep-wave risers, but only catenary risers are studied in this paper. Risers are extremely slender pipes that convey oil and gas from the seabed up to the offshore platforms. Keywords: Finite-element modeling, reduced-order modeling, riser, parametric instability, nonlinear dynamics, unilateral contact. The aim of this study is to discuss the feasibility, potentialities and limitations of the analytical model in confrontation with the specialist and the generalist softwares for the analysis of risers, under conditions of parametric excitation and unilateral contact at the seabed. The third model is an analytical reduced-order model that represents only the touch-down zone. Two are finite-element models, one studied with Orcaflex, an offshore marine system analysis software, and another one with Abaqus, a generalist structural analysis software. In this work, three catenary riser models subjected to harmonic oscillations are studied. MazzilliĮscola Politécnica da Universidade de São Paulo, Av. An analysis of parametric instability of risersĪuthor Fernando Y.
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