The use of viscous CFD simulations to evaluate the resistance of ships is well established. These
methods, however, often require a high number of calculation cells with consequent substantial
hardware requirements.
The objective of this paper is to standardize the operating modes to perform viscous simulations
with a rational approach basing on a lower number of cells, for carrying out more rapidly the
calculations, without super-computers. This operating mode will be supported by the study of
different hulls, displacement and planing, to evaluate a system of localized mesh-sizing of the
computational grid that could be standardized for each type of examined hull and to define a
protocol to get a good simulation in the shortest time possible
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