Added Resistance by Means of Time-Domain Models in Seakeeping

摘要

In many applications in seakeeping the added resistance plays an important role. It is observed that many of the existing methods underestimate the added resistance at low wave frequencies. This may be due to the way the potential is split up. It is shown that with the help of the steady wave potential obtained by RAPID, a linearization around the obtained steady free surface is possible and that the results obtained with a time-domain approach fit very well with the experimental results for a liquid natural gas (LNG) carrier obtained at MARIN. Also an asymptotic theory is presented that is able to predict the added resistance at low forward speed with rather simple means. In this case the problem is linearized with respect to the double body potential. Some results are shown for a circular cylinder.