Calm water wave resistance program


Potential flow and thin boundary layer solvers. Fast CFD for ships.




Potential flow and thin boundary layer method

Potential flow methods are a very powerful tool for optimising, for example the forebody of ships. The power lies in the accuracy in ranking design modifications in combination with the short computation time. The short computation time makes it possible to try many different variants or to set up a parametric optimisation that will finish within reasonable time.
Combining the potential flow method in XPAN with frictional resistance from the thin boundary layer method in XBOUND will include the viscous effects.


  • World’s most powerful free surface potential flow panel method. 
  • Linear or non-linear free surface boundary conditions.
  • First or higher order panels and singularity distributions.
  • Non-lifting or lifting flows.
  • Computes waves, wave resistance, lift, induced resistance, sinkage & trim and pressure distribution.
  • Threaded to speed up computations on multi core machines


  • Computes the thin boundary layer on the hull.
  • Momentum integral equations.
  • Small cross-flow approximation.
  • Laminar and turbulent.
  • Transition computed or fixed.
  • Computes the thin boundary layer.


  • Creates the mesh used in XPAN and XBOUND.
  • Uses offsets as input
  • Automatic offset generation from STL or IGES format.
  • Various hull configuration types: monohull, catamaran, trimaran, twinskeg...


  • Automatically generated report on html format created after each SHIPFLOW run.
  • Report contains customizable standard images and tables.
  • Format similar to and easily comparable to tank test report.