Finflo rans solver validation calculation for propeller open water flow and ship hull flow

This paper gives outline of the work at VTT in applying the FINFLO code to the hydrodynamic analysis of marine screw propellers and ship hull flow. In Section 2 the numerical method is briefly described. Section 3 presents propeller open water flow predictions for three marine screw propellers. In Section 4 the results of double model and free surface viscous flow calculations are compared with measurements. Predicted propeller open water thrust and torque for a propeller of simple geometry are within 1.5 percent of the experimental values for advance numbers close to the design value. For off-design operation points and for propellers with unconventional features, the differences in thrust and torque are higher. The hull flow computations predict the limiting streamlines in the stern region and flow separation satisfactorily. Some details of the wake field are not reproduced well. The computed total resistance coefficient and wave profiles for the Wigley hull model agree well with the experimentally coefficient is under-pridicated and the calculated wave profiles show stronger dissipation than the measured wave profiles.