CFD Analysis of Resistance for Stepless and Stepped Planing Hulls
Valtheru, Bhanu Prakash
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It is the endeavour of naval architects to design hull forms with the least amount of power consumption. In this respect, Naval Architects have been obsessed with the design of various hull forms optimized for a particular service requiring the lowest amount of fuel consumption keeping in mind effects on the climate change and sustainability. Regardless of the way that a considerable measure of research has been done around this area, there remains a level of uncertainty in the reasonably accurate resistance prediction of stepped hull forms in the early design stage. Model tests and full-scale tests are still the primary source of an investigation into the behaviour of planning hulls. Herein, two implementations of the model are presented.The first implementation used Computational Fluid Dynamics to analyze the resistance performance of stepped hulls and evaluate the results in light of model test results. Full details of the simulation set-up are given. The second implementation is the calculation of power required to propel the model at certain velocity and predicting savings per year with the decrease in brake power of the single step and two step planning hulls. The complete calculation and estimation has been given. The results of implementation were validated against experimental data found in the literature and showed an excellent agreement.