To be able to reduce the risk of shipping accidents, the environmental footprint, and maritime infrastructure costs, researchers need to continue to develop and test new prediction methods and tools. Improved and innovative maritime analyses will allow experts to make more accurate predictions about the effects of certain changes made to routes, infrastructures or traffic patterns, and provide better decision support to maritime actors. In late December, the latest research on maritime risk and environmental analyses was presented in a seminar at SSPA in Gothenburg
ηR is the relative rotative efficiency of a propeller that reflects the torque difference for a propeller working in the open water and in the behind conditions. It is obtained during the scaling of model test results with the standard ITTC-78 method. A research article, published in the Journal of Marine Science and Engineering (JSME), presents our new findings and a thorough explanation about the cause of low ηR-value for the low blade area propellers. Model testing and a RANS method with a transition model were used in this work to study the near-wall flow characteristics in open water and behind conditions for three different propeller designs.