Hydrodynamic optimization of semi-submersibles for...
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DNV GL © 2014 SAFER, SMARTER, GREENER DNV GL © 2013 Hydrodynamic optimization of semi-submersibles for better seakeeping performance 1 Jan Land DNV GL - Software
Transcript of Hydrodynamic optimization of semi-submersibles for...
DNV GL © 2014 SAFER, SMARTER, GREENERDNV GL © 2013
Hydrodynamic optimization of semi-submersibles for better seakeeping performance
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Jan Land
DNV GL - Software
DNV GL © 2014
Sesam CAESES software
ComputerAidedEngineeringSystemEmpoweringSimulation
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The case study uses Sesam CAESES software as a calculation tool for the analysis.
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Offshore industry
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Workflow
Variable Geometry
Pre-processing
Software Connection
Post-processing
Variation & Optimization
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How to optimize a semi-submersible
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Variable geometry
� Fully parametric surface model
� Constant displacement via volume
shifts
� Topology may change (e.g.
disappearing surfaces)
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Variations
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Pre-processing
� Structured PanelMesh used for
discretization
� Parametric refinement for all patches
� Customized export using Sesam’s
FEM-format
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Software connection
� Intuitive set-up using Sesam
CAESES’ SoftwareConnector
� Process chain connects
– Sesam HydroD
– PostResp
� Compute semi-submersible’s worst
relative motion within a given
seastate (air gap)
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Search
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Post-processing
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Variation & optimization
� Design of Experiments
– Sobol algorithm
– 150 variants
� Six free variables
� Constraints
– Keep displacement
– Keep draft
� Objective
– Find design with lowest
relative motion
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Improved design
Improvement
� Reduction of relative motion by about
4% when compared to baseline
� Decrease of wetted surface
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Baseline
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Result
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Contact info
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DNV GL - SoftwareDNV GL is the world-leading provider of software for a safer, smarter and greener future in the energy, process and maritime industries. Our solutions support a variety of business critical activities including design and engineering, risk assessment, asset integrity and optimization, QHSE, and ship management. Our worldwide presence facilitates a strong customer focus and efficient sharing of industry best practice and standards.
For presentation, software demo, training or quote please contact:
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SAFER, SMARTER, GREENER
www.dnvgl.com/software
Thank you
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