Computational fluid dynamics simulation of cavitating open propeller and azimuth thruster with nozzle in open water

摘要

Cavitation is crucial to control when designing a propeller as it is a major source of noise and vibrations. This type of pressure pulses, at least at low order close to the blade rate frequency, can today relatively exactly be modeled using potential flow methods. These, type of methods do however have physical limitations, preventing them to develop much further. With Computation fluid dynamics (CFD), on the other hands, some development is still needed to come to the same level as well validated potential flow codes. The possibilities to develop more advanced numerical models, also including higher order frequencies, are however much greater using CFD as compared to potential flow. In this Work a RANS method including cavitation modeling is used to study the cavitating flow in the Potsdam propeller 'rest Case (PPTC). This is done to validate the method with regard to cavitation including complex cavitation phenomena responsible for higher order pressure pulses. Furthermore, the same method is applied to a propeller on a ducted Azimuth thruster which introduces non-uniform loading on the propeller due to the azimuth structure. (C) 2015 Elsevier Ltd. All rights reserved.