ANSYS CFD for Naval Applications
Stephan Eder
[email protected]
ANSYS CFD for Naval Applications •
Preprocessing
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Geometry Meshing
Solver
AQWA CFX Fluent System Coupling Mechanical Electronic • •
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Postprocessing Design Exploration
Parameters Optimization Six Sigma Adjoint Solver …
ANSYS Geometry Tools •
ANSYS Design Modeler
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Import external geometries Sketching functionality Direct body creation Multiple body operations Fluid volume extraction Geometry clean-up tools Analysis tools …
ANSYS Space Claim
Direct modeler Pull, move, fill and combine tools Parameters without constraints …
Geometry Interfaces Geometry Interfaces Associative Interfaces (Associative, bidirectional and parametric) Creo Parametric Creo Elements/Pro Creo Elements/Direct Modeling Inventor SolidWorks Solid Edge CATIA Teamcenter
CAD Readers AutoCAD* AutoCAD* Creo Elements/Pro NX Inventor SolidWorks Catia IGES and STEP Parasolid ACIS GAMBIT * Requires an AutoCAD installation
ANSYS Meshing Tools •
ANSYS Workbench Meshing
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Hexa meshing Mesh sweeping Prism-Tetra meshing Cut-Cell meshing Global and local mesh sizings Size functions Quality checks Mesh improvment …
ANSYS ICEM
Key feature: Blockstructured hexahedral hexahedral meshing •
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ANSYS Fluent Meshing
Key features: Surface wrapping Advanced hexcore hexcore meshing Advanced cut-cell meshing Parallel meshing • • • •
Mesh Topologies h s e m l a r d e h a x e H
h s e m d i r b y H
h s e m e r o c x e H
h s e m l l e c t u C
Mesh Topologies h s e m l a r d e h a x e H
h s e m d i r b y H
h s e m e r o c x e H
h s e m l l e c t u C
ANSYS CFD - Solvers •
AQWA
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Potential flow solver Multi-body Hydrodynamic Hydrodynamic and Motion Analysis
CFX/Fluent:
Finite volume solver Pressure-based solver Density based solver
ANSYS AQWA •
ANSYS ® AQWATM
Fully Integrated Multi-body Hydrodynamic and Motion Analysis Mooring, stability, stability, vessel motions in regular and irregular waves •
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within time and frequency f requency domain with coupled cable dynamics with forward speed
Courtesy of PI-RAUMA Ltd.
ANSYS AQWA •
Offshore Structures
Fixed • •
Compliant •
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Floating Production, Storage and Offloading unit (FPSOs) SPARS Semi-Submersibles Tension leg platforms (TLPs)
Risers
Ships
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Jack-ups
Floating •
JACKETS Concrete
Design Offloading
Harbours
ANSYS AQWA
ship & landing craft
lifting operation
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AMOG
transportation
jacket launch
shielding
self-installing platform Arup Energy
line Breakage
mooring systems
FSO and SPM with shuttle tanker
stinger
cargo lowered onto vessel
offloading operation SBM
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ANSYS AQWA Capabilities •
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Diffraction/Radiation including Morison elements Frequency domain analysis Stability including mooring lines Time domain with irregular waves Time domain with non-linear survival waves Coupled cable dynamics Multiple hydrodynamic hydrodynamic interaction and articulations (up to 50 structures) Transfer of motions and pressures to ASAS & ANSYS FE models
ANSYS AQWA Modeling •
Capabilities
Diffracting or non-diffracting non-diffracting panels Morison elements TUBE STUB DISC Point masses Mixed models Moorings Linear springs Elastic catenaries Intermediate buoys Tethers Pulleys Fenders Articulations • • •
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ANSYS AQWA Modeling •
Environment
Waves Regular / irregular Time history Wave Spectra Pierson-Moskowitz JONSWAP User-defined Cross-swell Current Uniform Profile Wind Uniform Spectra Time history • •
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ANSYS CFD •
ANSYS CFD offers special marine related tools: Open (wave) channel flow Compressible liquids Implicit six degree of freedom solver Wide range of dynamic dynamic mesh capabilities
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) u a b r e s s a W r ü f t l a t s n a s e d n u B f o y s e t r u o C ( g n i t f i l e c i u l S
ANSYS CFD •
Wave regimes
First order Airy wave theory Stokes wave theories Cnoidal & Solitary Wave Superposition Superposition Standing wave Beats or wave groups Constructive and destructive destructive interference Irregular waves •
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ANSYS CFD •
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and a lot more
Single-/multiphase Cavitation Acoustics Energy/radiation/solar load Species transport/ chemical reactions Turbulence Particle Flows (Discrete phase/Discrete element/MPM)
Smoke from a large production deck pool fire (Courtesy of Daewoo Shipbuilding) Shipbuilding)
Climatisation of a Separator Room (Courtesy of Flensburger SchiffbauGesellschaft (Flensburg Shipyard))
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Additional Input via user programming Propeller Cavitation (Courtesy SVA-Potsdam (Potsdam Model Basin))
ANSYS CFD •
Mesh motion:
Automatic mesh adaption Tetra/cut-cell: Smoothing Remeshing Hexa/prism: Smoothing Layering Six degree of freedom + implicit 6DOF Immersed solid •
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) u a b r e s s a W r ü f t l a t s n a s e d n u B f o y s e t r u o C ( g n i t f i l e c i u l S
ANSYS CFD •
Optimizer & mesh morpher:
User defined objective function User defined deforming
Baseline Design
Optimized Design Objective function: Max. lift
Objective Function: Uniform flow at the outlet
ANSYS CFD •
Fluent Adjoint solver
Submarine example: Submarine drag optimization Sensitivity plots Geometry deformation 35 % drag reduction within 25 optimization loops
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ANSYS CFD •
Numerical Towing Tank
ANSYS Workbench Geometry Import geometry in Design Modeler Define global geometry parameters •
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Automatic domain creation
Meshing Automatic import into Meshing •
Define global meshing parameters Automatic mesh creation creation
Solver Automatic import into the Solver •
Define boundary conditions Calculate
Post-Processing Automatic import into CFD-Post CFD-Post •
Examine results
ANSYS CFD •
System Coupling
Multiphysics coupling Structural mechanics Heat transfer Fluid flow Electromagnetics
Thank you for your attention
