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Advanced Numerical Tools for Marine Operations: Enhancing Accuracy and Efficiency

This presentation by Kværner ASA and DNV explores the application of numerical tools and analysis software in marine operations. It discusses the importance of using advanced models, such as hydrostatic and hydrodynamic analyses, to achieve better accuracy and quality in marine engineering. The session highlights various commercial tools that save time and enhance quality checks compared to in-house solutions, ensuring client acceptance. Key analysis methods covered include time-domain coupled analyses, CFD, and FEM, all aimed at delivering reliable results for normal ship hull operations.

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Advanced Numerical Tools for Marine Operations: Enhancing Accuracy and Efficiency

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Presentation Transcript

  1. Edit this text for your title MEK 4450 Marine Operations Edit this text for your sub-title Presenter name, location, date etc. Kværner ASA / DNV, Fall 2012

  2. Numerical Tools / Analysis Software Whynumericaltools? More accurate and detaileddescription Whycomercialtools: Time consuming to produceinhouse Better qualitychecks (?) Clients acceptance

  3. Numerical models Hydrostatic / stabilitymodels (e.g. AutoHydro, Hydro D) Basic hydrodynamic analyses (e.g. WADAM, WAMIT) Time domaincoupeled analyses (e.g. SIMO) CFD Beam theory (e.g. Orcaflex, Riflex) FEM

  4. Hydrostatic Analysis

  5. Hydrostatic model • INPUT • Wet hull shape • Mass • COG • OUTPUT • Floating condition • Stability margins • MODEL • Geometry: stripes • Mass and COG • Archimedes • Buoyancy and moments Use with care for non- standard aplications Purpose made For normal ship Hull and normal operations Quick and simple to use

  6. Stability characteristics: four examples

  7. Hydrodynamic Analysis

  8. Floating object in waves - standard theory • INPUT • Wet hull shape • Mass distribution • OUTPUT • Motion, pressure ++ • Transfer function • Postprocessing • MODEL • Geometry: panels • Mass matrix • Inviscid • Incompressible • Vessel: rigid body • Incident waves • Viscous damping neglected • Couplings and nonlinearity neglected Purpose made For normal ship Hull and normal operations Quick and accurate solutions when relevant

  9. Transfer function

  10. Time Domain Analysis

  11. Time domain simulation program • INPUT • (Hydro)dynamic characteristics • Links, wires, beams etc • Environment • OUTPUT • Time series for motions, forces etc • Design values: post processing • MODEL • Rigid body motions • Forces from environments and links • Quality of coefficients? • Time consuming Stepping forward in time. Runge Kutta etc Realistic modeling of marine operations

  12. CFD

  13. CFD • INPUT • Boundary geometry and conditions • Initial conditons • Fluid and turbulence parameters • OUTPUT • Fields for velocity, pressure etc at different time steps • Integrated quantities • MODEL • Viscous fluid • Turbulence • Bodies with prescribed motion • Time consuming • Floating bodies? Stepping forward in time. Runge Kutta etc Realistic modeling of fluid flow Accurate (?) calcs of coefficients

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