Minimising numerical ventilation in CFD simulations of high-speed planing hulls

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Abstract

Numerical Ventilation (NV) is a well-known problem that occurs when the Volume of Fluid method is used to model vessels with a bow that creates an acute entrance angle with the free surface, as is typical for both planing hulls and yachts. Numerical Ventilation may be considered one of the main sources of error in numerical simulations of planing hulls and as such warrants an in-depth analysis. This paper sets out to bring together the available work, as well as performing its own investigation into the problem to develop a better understanding of Numerical Ventilation and present alternate solutions. Additionally, the success and impact of different approaches is presented in an attempt to help other researchers avoid and correct for Numerical Ventilation.

Interface smearing caused by the simulation being unable to track the free surface is identified as the main source of Numerical Ventilation. This originates from the interface between the volume mesh and the prism layer mesh. This study investigates this interface, presenting a novel solution to prism layer meshing that was found to minimise Numerical Ventilation. Through the implementation of a modified High Resolution Interface Capture (HRIC) scheme and the correct mesh refinements, it is possible to minimise the impact of Numerical Ventilation to a level that will not affect the results of a simulation and is acceptable for engineering applications.
Original languageEnglish
Article numberOMAE-20-1113
Number of pages17
JournalJournal of Offshore Mechanics and Arctic Engineering
Early online date5 Feb 2021
DOIs
Publication statusE-pub ahead of print - 5 Feb 2021

Keywords

  • numerical ventilation
  • volume of fluid
  • vessels
  • interface smearing
  • high resolution interface capture (HRIC)
  • mesh refinements

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