Propeller Analysis Using RANS/BEM Coupling Accounting for Blade Blockage
Defence Research and Development Canada Dartmouth, Nova Scotia Canada
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A popular method for analyzing a propeller operating behind a ship is to couple a Reynolds-averaged Navier-Stokes RANS solution of the flow around the hull with a solution for the flow around the propeller calculated using the Boundary Element Method BEM. In the RANSBEM coupling procedure, it is important that both solvers agree on the upstream propeller induction. Failure to do so causes an under-prediction of the thrust and torque. A method of accounting for the blade blockage by adding source terms to the equation of continuity in the RANS solver is described. Estimates of the importance of the blade blockage effect are obtained by analyzing the propeller of the well-known KRISO container ship KCS.
- Marine Engineering