All news Events

Resist shallow-water correction

Posted on December 18, 2019

The PIAS module Resist, which can predict resistances of different ship types with nine published empirical methods, has been expanded with a shallow-water correction. The implemented method is based on H.C. Raven, “A new correction procedure for shallow-water effects in ship speed trials”, Proceedings of PRADS2016 (2016), Kopenhagen, Denmark. In 2017 the ITTC has accepted this method, and now it can be used in Resist to predict the increase in resistance when sailing in shallow waters.

Output table of Resist with the shallow-water correction enabled. Marked in red are the newly calculated resistance components, the additional viscous resistance due to shallow water Rv,add and the additional resistance due to sinkage in shallow-water conditions Rs,add.