Offshore fields, specifically, deepwater oil and gas reserves, have been receiving increasing attention with the increasing consumption of petroleum products. Marine risers are critical to the petroleum industry. The steep wave riser (SWR) is becoming increasingly popular as its use has provided a solution for oil and gas exploration in water depths where traditional rigid risers could not tolerate the environmental loads or would have become very costly. A numerical model of an SWR with internal flow is built based on the slender rod model and the finite element method. The Newton-Raphson and the Newmark- methods are used to solve the non-linear static and dynamic problems, respectively. A calculation program, SWRNM, is developed. The results of a sensitivity analysis indicate that the buoyancy section, current, internal flow, and floater have significant effects on the SWR, and can provide guidance for future SWR designs

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