Computing ship wave resistance from wave amplitude with a non-local absorbing boundary condition
✍ Scribed by Storti, M. ;D'Elía, J. ;Idelsohn, S.
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 260 KB
- Volume
- 14
- Category
- Article
- ISSN
- 1069-8299
No coin nor oath required. For personal study only.
✦ Synopsis
A method for computing ship wave resistance from a momentum ¯ux balance is presented. It is based on computing the momentum ¯ux carried by the gravity waves that exit the computational domain through the outlet plane. It can be shown that this method ensures a non-negative wave-resistance, in contrast with straightforward integration of the normal pressure forces. However, this calculation should be performed on a transverse plane located far behind the ship. Traditional Dawson-like methods add a numerical viscosity that dampens the wave pattern so that some amount of momentum ¯ux is lost, and resulting in an error in the momentum balance. The ¯ow ®eld is computed, then, with a centred scheme with absorbing boundary conditions.