Adaptation of STAR-CCM+ Numerical Wave Tank to an Offshore Floater Design Tool
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1 Adaptation of STAR-CCM+ Numerical Wave Tank to an Offshore Floater Design Tool Jang Whan Kim Chief Technical Advisor, Offshore Technology Services
2 Agenda Introduction Design Spiral Requirements on Design Tools Technology Readiness / Gap Euler Overlay Method Applications
3 Three Generations of Spar Platforms CLASSIC TRUSS CELL TRUSS Technip has delivered 14 out of the 19 spars worldwide, in a water depth range of 590 2,382 meters using both dry and wet tree completions. Four more spars are under design/construction by Technip 3 Technip Presentation
4 Offshore Floaters TPG 500 Unideck TLP Semi-submersible Spar FPSO/FLNG Wind 4 Technip Slide Library Supporting subsea system Operations in harsh environment Survive and protect crew / equipments in extreme environments Small Motion
5 Design Spiral of Offshore Floater Design Hull Sizing Global Performance WAMIT / MLTSIM Motion Solver Calibration Base Design Model Test 6 month after project start Wind Wave Tow Air gap / green water / Slamming / VIM / Topsides wind load
6 Design Spiral of Offshore Floater Design with CFD Global Performance Hull Sizing CFD Less uncertainties Shorter design period More design optimization Validation Model Test before project
7 Expectations on Design Tools (Global Performance) Accuracy Tolerance < 10% Preferably conservative side Robustness No crash No surprise Predictable schedule Speed (Screening Tool) Less than 10 min for a short-term (3-hr) simulation Runtime (Final Evaluation Tool) One run < 12 hr for diagnostic runs One run < 24 hr for production runs
8 Existing Design Tools Nonlinear Time-Domain Motion (MLTSIM) Hydrodynamic coeff. From WAMIT Morison drag Nonlinear Froude-Krylov force Large amplitude formulation Mooring / SCR Modeling Quasi-Static Analysis (FMOOR) Catenary model 5-10 min for 3-hr simulation Screening Tool Model Test MLTSIM Calibration Run up / Air Gap / Green Water Ringing 8
9 Design Tools with Numerical Wave Tank Nonlinear Time-Domain Motion (MLTSIM) Hydrodynamic coeff. From WAMIT Morison drag Nonlinear Froude-Krylov force Large amplitude formulation Mooring / SCR Modeling Quasi-Static Analysis (FMOOR) Catenary model 5-10 min for 3-hr simulation Screening Tool Numerical Wave Tank MLTSIM Calibration Run up / Air Gap / Green Water Ringing 9
10 Technology Readiness STAR-CCM+ Features Free-surface capturing Moving mesh technique DFBI Embedded DFBI X Overset X Powerful built-in pre/post processors Hardware In-house cluster (144 cores) TACC Stampede ( ~ 10,000 cores) 1-hr simulation in one day (Semi-submersible)
11 Stampede TACC, Univ. of Texas at Austin Intel Sandy Bridge CPU 102,400 Cores in 182 Racks 2 Peta (10 11 ) FLOPS STAR Program $25,000 Annual Fee for Access to 10,240 Cores $0.05 / Core Hr 11
12 Technology Gap / Solution Wave Input 5 th -Order Stokes Wave Good for deep water Not good for shallow water extreme waves Random wave input does not meet industry best practice Random seeding Wheeler stretching Many users were using customized user functions Fully-nonlinear wave models In-house wave codes Far-Field Closure No wave-absorbing mechanism in up-wave side Larger domain required Numerical damping sometimes help Euler-Overlay Method Mooring / Riser Modeling Built-in catenary model Good for tendon and taut mooring Not good for SCRs and non-taut mooring No dynamics In-house Catenary / Rod models
13 Euler Overlay Method History Bai & Yeung (1974): Matching FE/BE solution with analytic solution Kim & Bai (1991): Nonlinear radiation problem (Matching) Kim, Kyoung, Ertekin & Bai (2003): Nonlinear diffraction (Overlaying) Kim, Rajeev & O Sullivan (2011): Nonlinear diffraction (CFD, Overlaying) Kim, Read & O Sullivan (2012): Nonlinear diffraction (STAR-CCM+, Overlaying) Far-Field Solution Euler solution Overlaying Boundary condition Momentum and volume fraction source / sink term in blending zone 13
14 Long-Crested Wave and a Vertical Column (OMAE2012) 2D Euler Wave Flume Length: 105 m CFD Domain Length: 2 m 14
15 Ringing Analysis of a GBS (Short-Crested Irregular Wave) Dynamic amplification of structural load due to resonant response of structure to higher-harmonic load
16 Semi-Submersible Motion Simulation Mooring and Riser Model Look-up table for SCR and Mooring Force Heave RAO from White-Noise Wave Test 1-hr simulation 16 hours with 640 cores WAMIT
17 Hull Optimization for Dry-Tree Semisubmersible Case1 & Case5: Original TTR and Mooring C & C0093: Revised TTR and Mooring 17 Footer can be customized
18 Computational Cost TLP 3.0 mil cells, dt = s 5 min simulation Number of Cores Semi Run Time Service Unit Stampede Unit Cost Cost Service Unit Star CCM+ Unit Cost Cost Total Cost $ $ mil cells, dt = 0.1 s 1 hr simulation Number of Cores Run Time Service Unit Stampede Unit Cost Cost Service Unit Star CCM+ Unit Cost Cost Total Cost $
19 Towards Industry Acceptance NWT Technology Readiness STAR-CCM+ Euler Overlay Method Cloud computing On-Going Improvements Wave models Wave re-construction Mooring / riser modeling Recommended Practice for Numerical Wave Tank DnV leads Numerical Wave Basin JDP in 2013 JIP to be announced in 2014
Wave Tank to an Offshore Floater Design Tool 18 MARCH 2013
Adaptation of STAR-CCM+ Numerical Wave Tank to an Offshore Floater Design Tool STAR Global Conference 2013 18 MARCH 2013 Agenda Introduction Design Spiral Requirements Technology Readiness / Gap Euler
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