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NAPA Flooding Simulation

Design can be improved with NAPA Flooding Simulation.

By using NAPA Flooding Simulation the designer gets a better understanding of the flooding mechanisms. The safety of the design improves as it can be evaluated more comprehensively. The developed pressure-correction technique allows a time-accurate solution of progressive flooding, internal water flow and air compression inside the ship.

NAPA Flooding Simulation has been successfully validated against measurements both from dedicated model tests and full-scale experiments with a decommissioned fast attack craft. Several different flooding scenarios, some involving also notable air compression, have been analyzed with good correspondence between the simulation results and measurements. An example is shown in the figure below.

Comparison of measured heel angle from the full-scale tests and simulation results using both rough estimations for input values and results of dedicated analysis of the discharge coefficients for the openings

Applications and benefits today 

  • Alternative cross-flooding calculations for cargo and passenger ships including the effect of air pipes (MSC .245(83))
  • Progressive flooding and internal water flow investigations for, for example, passenger ships and floating docks
  • Decision support and flooding control (time to flood/sink) on board the ship
  • Modelling of accumulation of water on deck

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Design Solutions

NAPA Flooding Simulation +

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See an example of use


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Phone: +358 9 22 8131

Email: sales [ at ] napa.fi