Napa Cracked

The NAPA system contains state-of-the-art tools for hull form definition and optimization. A true surface model of the hull is created, avoiding old-fashioned techniques based on interpolation. NAPA brings the conceptual hull form all the way to the production stage, including final fairing.
The hull surface is usually the starting point for any design and analysis done in NAPA, and forms the basis for the compartment and structural models.
NAPA’s topological approach to hull surface definition facilitates fast and easy design, and increases productivity. NAPA supports several methodologies for hull design, including real 3D surface modelling, transformations, parametric definitions and more. The unique NAPA hull design methodology allows better control and more flexibility in the hull surface than other modelling systems while still maintaining the exactness needed for final fairing work. NAPA’s Open GL graphics and lighting, sectioning and curvature plotting tools allow the user to quickly and visually evaluate the fairness of the hull.

Hydrodynamic Design and Analysis

Integrated performance prediction routines facilitate the evaluation of the hull design quickly in the early design stage.

• Power prediction, including model and full scale reference data.
• Seakeeping analysis, 6. d.o.f. response in irregular waves, seakeeping criteria, downtime.
• Manoeuvring simulations according to IMO resolution A.751(18).
• Station keeping and other special studies.
  

Hull Form Optimization and CFD Analysis

More detailed hull design evaluation and optimization based on CFD is available entirely within the NAPA system.

• Wave resistance according to an integrated CFD method.
• Panel model generation and transfer to external advanced CFD systems.
• Multi-objective genetic algorithms to handle any kind of optimization problem.

Optimization, parametric definitions and the hydrodynamics subsystems make NAPA one of the only, if not the only, system which integrates all of the tools necessary for hydrodynamic design of the hull surface.