Effects of fully developed turbulent internal flow on marine risers' dynamics

Katifeoglou, SA; Chatjigeorgiou, IK; Mavrakos, SA

dc.contributor.author	Katifeoglou, SA	en
dc.contributor.author	Chatjigeorgiou, IK	en
dc.contributor.author	Mavrakos, SA	en
dc.date.accessioned	2014-03-01T02:53:37Z
dc.date.available	2014-03-01T02:53:37Z
dc.date.issued	2012	en
dc.identifier.issn	10986189	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/36451
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-84866061771&partnerID=40&md5=b2e3f24ff29c3272841f938439d61bef	en
dc.subject	Catenary Risers	en
dc.subject	Dynamic Response	en
dc.subject	Offshore Applications	en
dc.subject	Pipe Flow	en
dc.subject	RANS	en
dc.subject	Turbulence Modeling	en
dc.title	Effects of fully developed turbulent internal flow on marine risers' dynamics	en
heal.type	conferenceItem	en
heal.publicationDate	2012	en
heal.abstract	The present study aims at simulating the internal, incompressible, turbulent flow of a catenary riser and evaluating the flow effects on its structural response. Firstly, the static equilibrium problem is considered to obtain the static geometrical configuration of the structure which is described by nodal coordinates in a local Lagrangian coordinate system. The nodal coordinates are accordingly used for the representation of the flow field within the pipe along its complete suspended length. The flow field is discretized by applying an appropriate Finite Volume Scheme while a Realizable k-ε turbulence model associated with an appropriate Near-Wall Treatment is used for the numerical simulation of the Reynolds-Averaged Navier-Stokes equations (RANS), with the use of ANSYS Fluent commercial code. The investigated flow parameters are collected at discrete locations of the flow field, corresponding to the structural discretization. Especially the varying dynamic pressure values are integrated on the crosssectional area for producing local axial forces. Accordingly, these flowinduced forces along with averaged velocities are imported as local tension loads within an in-house linear dynamics structural model which is solved numerically using a Finite Differences scheme. Overall, an appraisal of the turbulence modeling approximation compared with the plug-flow approximation, regarding the contribution of the flow on structural response, is accomplished. Copyright © 2012 by the International Society of Offshore and Polar Engineers (ISOPE).	en
heal.journalName	Proceedings of the International Offshore and Polar Engineering Conference	en
dc.identifier.spage	410	en
dc.identifier.epage	417	en