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Sirehna's Contribution to WP5 and WP6 - Status and Progress

Sirehna's Contribution to WP5 and WP6 - Status and Progress Yves-Marie Lefebvre - yves-marie.lefebvre@sirehna.com. Reminder Fabrice Ghozlan has taken new responsibilities at Sirehna Not involved in the DIFIS project anymore New contact at Sirehna

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Sirehna's Contribution to WP5 and WP6 - Status and Progress

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  1. Sirehna's Contribution to WP5 and WP6 - Status and Progress Yves-Marie Lefebvre - yves-marie.lefebvre@sirehna.com

  2. Reminder • Fabrice Ghozlan has taken new responsibilities at Sirehna • Not involved in the DIFIS project anymore • New contact at Sirehna • Fabian Pecot (+33 2 51 86 02 91, sirehna@sirehna.com) • Technical work on WP6 • Yves-Marie Lefebvre (+33 2 51 86 02 81, yves-marie.lefebvre@sirehna.com)

  3. WP5 - Early Design Initial start: March 2006 (June 2006?) Duration: 6 months

  4. WP5 • - Sirehna's task not completely defined yet. • To be finalized with WP leader (SENER). • - With regards to our know-how and resources (5 MM) • - Focus on buffer bell conception - proposition and evaluation of different alternatives • - Connections design to be handled by an appropriate partner • - Status : not started yet. Waiting for input data from : • WP2, WP3 and WP4

  5. WP6 - Concept Verification and Optimization Task 6.1: Conceptual Hydraulic Calculations March 2006 to April 2007

  6. WP6 Task 6.1: Status ……………………………………. Completed ……………………………………. Running …………………………..……. To be started soon …………………………..…………To follow ……………………………………. To follow Preliminary study Bibliography 2D CFD simulations 3D CFD simulation 1D model of the riser

  7. B Oil: r n Water: r1 a A WP6 Preliminary study of oil flow - Flow is supposed to be mono-phasic inside the riser - Re is very low (< 2000) - Bernoulli equation between points A and B gives Q = (r1-r) p g D4 sin a /128n With: - Q mass flow - r density - D riser internal diameter - n kinematic viscosity

  8. For 100 tons/day WP6 Preliminary study of oil flow (2) • Use of this equation to evaluate the necessary internal diameter D • - 3 flow rates defined (cf. minutes of Patras meeting) : 1 ton/day, 10 tons/day, 100 tons/day • - r1 (sea water) : 1027 kg.m-3 • - r (oil) : range from 800 to 1000 kg.m-3 • - n (oil) : range from 5,000 to 100,000 cSt - worst case scenario (cf. WD on operational scenario 1 - ISI): Boscan at 38°C

  9. WP6 Bibliography - First results • The main limitation of preliminary models is the drag formulation.To make the models more reliable, we need a characterization of the diphasic flow in the dome and the riser. •  CFD • No 2D or 3D CFD model can represent the full geometry (riser length: 4000 m) •  Final riser model will have to be 1D • Results from CFD study will be used as input to the 1D model

  10. WP6 Bibliography - First results (2) • Expected flow structures (oil filaments, plumes or bubbles in sea water) are fully 3D. •  2D model is irrelevant • 3D model will be CPU expensive :VOF model, low velocity, large fluid domain, transient ... • 2D models will be used for "calculation set up" only:grid size sensitivity study, choice between iterative and non-iterative methods, settings of adaptative time step methods (Fluent 6.3 beta) • 3D model on worst case scenario

  11. WP6 Expected outputs from CFD models High quality pictures and animations - Use for WP10 dissemination

  12. WP6 WP6 Expected outputs from CFD models

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