Numerical Simulation Of The Hydrodynamic Effect Of Hull/propeller Interaction

The effect of hull-rudder-propeller interaction is an important and most challengingresearch problem, which has long plagued the ship hydrodynamics circles as a whole, andalso is one of the current research focuses in this field. So far, the researchers from allaround the world have carried out a lot of theoretical、experimental and numerical researchwork on it. Because of the geometric complexity of the ships and propellers and thecomplexity of turbulent swirling flows, it remains an unsolved problem at present,especially the interaction effect between hull and propeller. After reading lots of relatedliteratures and papers at home and abroad, in-depth and systematic numerical studies onhull-propeller interaction are carried out. These studies have some theoretical significanceand practical value in engineering applications.The Reynolds-averaged Navier-Stokes equations governing incompressible fluidflows are solved by the Semi-Implicit Method for Pressure-Linked Equations （SIMPLE）algorithm, enclosed with the SST k-ω turbulence model. A Multiple Reference Frame（MRF） method and a Sliding Mesh (SM) method were applied respectively to predictthe open water hydrodynamic characteristics of a four blades KP458propeller working inuniform free stream, and the thrust coefficient and torque coefficient of the propeller insteady and unsteady flows are calculated numerically. The results are in well agreementwith the experimental data.The viscous flow around the ship model KVLCC2with free surface is numericalsimulated based on the Pressure Implicit with Splitting of Operation（PISO）scheme,combining the k-εand SST k-ωturbulence model, the results are compared with theexperimental data, and the discrepancy calculated with the SST k-ω model is smaller thanthat with the k-ε model, so it can be concluded that SST k-ω is more suitable here.Finally, concerning the geometric complexity of the propeller and ship, unstructuredgrid is used to simulate the transient flow field around the KVLCC2ship with a propeller,the pressure distribution on the aft part of the hull when the propeller rotating is obtained，and the result is compared with the ship without propeller. The pressure distribution ofship with propeller has been changed greatly, the total hull resistance is also increased.