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The distribution of the angles of attack over the span of a rotor blade, together with blade element theory, provides a useful framework to understand forces, performance and other fluid dynamic phenomena of axial‐flow rotors. However, the angle of attack is not straightforward to define for a three‐dimensional rotor, where the flow is perturbed by the blade circulation, shed vorticity and wake development...
The current work presents a novel way to evaluate the interaction effects in a diffuser-augmented hydrokinetic turbine (DAHT) under the terms presented on the generalized actuator disc theory described by Jamieson (2011). Transient RANS CFD methods are employed to obtain the performance, thrust, and average flow speeds at the turbine plane in simulations performed in three comparable cases: bare turbine,...
AUVs are self-propelled and able to navigate at an acceptable speed, but they need an electric motor and batteries that are limited in autonomy. Multivehicle fleet deployment can provide an adequate platform for conducting long term surveillance. Unexpected event detection can be more easily conducted if a set of vehicles in idle mode are expecting the occurrence of this event. Long term and high...
The coordination between a fleet of ocean automatic vehicles is an interesting area of research. The communication between an Autonomous Underwater Vehicle AUV and in-shore stations is a difficult question. Satellite communications are expensive; they provides only a limited bandwidth and the link is not always guaranteed when it is needed. High speed communications are difficult from underwater vehicles...
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