Research on the parametric design of an inlet duct found in a marine waterjet

In order to satisfactorily design an inlet duct found in marine waterjets in a way that economically uses time and money,a parametric design method was investigated in this article.The 3-D geometry of the inlet duct was characterized and created by eleven governing parameters which were incident with one another.Its shape could be modified automatically by turning the value of the governing parameters.The viscous flow in regions around the inlet duct and stern was simulated by means of a computational fluid dynamics code.The hydrodynamic performance of the inlet duct can be evaluated in the round according to flow uniformity at the duct outlet,flow separation,cavitations,flow loss inside the duct,and the applicability to various working conditions.Multiple iterations between the parametric modification of the geometry and CFD simulation of the flow field can quickly result in an excellent inlet duct design.