![]() Different riser materials, riser configurations, production stages (flow rates) and environmental conditions are considered. The riser system connected to a moored vessel in deep-water is considered for the parametric study. Parametric studies are performed in order to quantitatively identify the design conditions that are most affected by the slug flow. The verifications of the numerical model and slug modeling method are carried out prior to the parametric study. ![]() Local stress and fatigue damage of risers are estimated using an in-house program, which considered the hysteresis effects of a flexible riser. Idealized regular slug flow are considered as a time dependent variation of internal fluid flow according to results of multiphase flow simulations. A global dynamic analysis is carried out to calculate the dynamic responses of a riser induced by the slug flow and environmental loads. In this paper, a methodology has been developed for the evaluation of the effects of slug flow on the dynamic and structural responses of different types of risers. Dynamic and structural responses of a riser can be increased by time varying forces of the slug flow. ![]() A slug flow (a series of liquid slug separated by a gas pocket) is a flow pattern that often occurs in a multiphase oil and gas riser system.
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