Vol. 52 No. 4 (2015)   New Products & Technologies
Technical Papers

Study on Practical CFD for Unsteady Vortices from Trailing Edge of Propeller Blades

TAKUYOSHI YAMADA
CHIHARU KAWAKITA

The reduction of underwater noise radiated from vessels and underwater vehicles prevents product problems and increases added value. One of the sources of underwater radiated noise is the propeller that produces the propulsion of a vessel or underwater vehicle. This article describes the method for analyzing the unsteady vortices that are generated around blades with high accuracy using CFD. Unsteady vortices cause singing noise among propeller noises. For the analysis method, ELES, which is a combination of RANS with a low calculation load and LES with a high calculation load, was used on understanding the ship-scale phenomenon with a relatively low calculation load. We chose the case in which the blade model was fixed in a uniform flow as the stage that precedes its application as a propeller. The general-purpose calculation domain decomposition method for ELES was constructed. We will develop low noise propellers by applying this method to propeller design.