Wave resistance prediction.

[Alexanov]

Some time, between hulls can be generated huge wave, as an interference of the wave patterns from each hull. As I understand it's depends from distance between hulls, hull lenght, speed and so on... Is any simple method to predict this situation on early design stage?

 

[Alexanov]

I found only this...

http://academic.amc.edu.au/~psahoo/Research/HIPER01_paper.pdf

 

[hump101]

Look for the papers from Tony Molland and Patrick Couser from University of Southampton, for example:

http://eprints.soton.ac.uk/46409/1/127ShipScience_Report.pdf

http://eprints.soton.ac.uk/46441/1/072.pdf

 

[Alexanov]

Thank's. I will study it. One of my client design small workboat catamaran. That was some problem on 12 knots speed - huge wave beetween hulls. Soo shipowner was not happy. If we will be able to predict this situation, it will help to avoid such problem.

 

[Will Fraser]

The free Michlet program is a useful tool that can predict wave interference between hulls. The link to download it should still be available on the forum - just do a search for it.

I have only used it to to evaluate simple hull shapes for a 12ft trimaran concept. By careful choice of hull spacing, it is possible to even cancel a portion of the wave drag, but this seems to only happen over very limited speed ranges. It also seems that the more a particular design cancels the wave drag at a particular speed, the more it reinforces it outside the beneficial speed range.

I have yet to try it out, but there is a separate program called Godzilla that combines the results from Michlet with a genetic algorithm to search for optimum design parameters.