CFD Simulations to evaluate the Ship Resistance: Development of a systematicmethod with use of low number of cells.

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

CFD Simulations to Evaluate the Ships Resistance: Development of A Systematic Method with Use of Low Number of Cells

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

Computational simulations with low cells number for displacement hulls and planing boats: a rational approach

The aim of work is to study and standardize the operating modes to do viscous simulations with a rational approach with low cells-number, for carrying out quickly the calculations, without any necessity of super-computers. This methodology involves the study of different hulls, displacement and planing, evaluating a system of localized mesh-sizing of the computational grid that could be standardized for each type of examined hull.In addition a protocol to get a good simulation in the shortest time possible is attempted. In the first part of the study 3-DOF simulations for evaluating trim, resistance, pressure field and waves of a series of vesselswere carried out. Then the numerical results were compared with experimental towing tank tests. Finally , the method was applied for searching the best dynamic trim for some displacement and semidisplacement hulls

Comparison between RANS Simulations with low number of Cells and BEM Analysis for a high Speed Trimaran Hull

The use of RANS 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. BEM analysis can be performed in a short time and with modest hardware resources, but returned more qualitative results without the viscous part, even if proven and reliable. The objective is to achieve good RANS simulations in a short time so as to make them competitive with panel methods especially in the evaluation phase of different design alternatives. The aim of this work is to study and standardize the operating modes to do viscous simulations with low number of cells, for carrying out more rapidly the calculations, without any necessity of super-computers. The foregoing methods are applied to study high speed trimaran hulls. For the RANS method a system of localized mesh-sizing of the computational grid is evaluated to get a good simulation in the shortest time possible. Results for resistance and trim from RANS 3-DOF simulations are compared with experimental towing tank tests and with BEM analysis also using transverse and longitudinal wave-cuts. 1