COUPLING OF VORTEX-LATTICE METHOD WITH RANS FOR THE PREDICTION OF OPEN OR DUCTED PROPELLER/AXISYMMETRIC HULL INTERACTION

摘要

An iterative method which couples a vortex-lattice method with a Reynolds-Averaged Navier-Stokes (RANS) method is applied to the prediction of propeller/axisymmetric hull interaction. An open propeller and a ducted propeller are considered. In the coupling procedure, the effective wake is evaluated at the propeller control points. In RANS the propeller blades are represented with body forces distributed over the propeller zone. The hull resistance is evaluated in the presence of the propeller, and the propeller RPM is determined by equating the hull resistance with the propeller thrust. The present approach handles the propeller/hull interaction automatically, without the need for assumed values of the wake fraction and of the thrust deduction factor.