Author Algie C., Gourlay T., Lazauskas L. and Raven H. C.
Title Application of potential flow methods to fast displacement ships at transcritical speeds in shallow water
Conference/Journal Applied Ocean Research
Month February
Year 2018
Volume 71
Number DOI: 10.1016/j.apor.2017.11.009
Pages 11-19

Computer codes implementing three different numerical methods for the prediction of ship squat at transcritical speeds in shallow open-water are tested. SlenderFlow is a potential flow code specifically for ships in very shallow water, based on partially dispersive slender body theory. Flotilla is a potential flow code based on fully dispersive thin-ship theory. Rapid is a general nonlinear free-surface panel code. Code predictions of transcritical sinkage, trim and resistance in laterally unrestricted water were compared to the experimental results of Graff (1964) for two Taylor series hulls in a finite-width towing tank. Once tank width effects were accounted for, each of the three codes was found to give good predictions within the valid range of the underlying theory. A simple method for estimating transcritical wave resistance from trim is presented.

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