student profile: Mr Hangyu Qiu


Thesis work

Thesis title: Investigation of the Drag Reduction Performance of Shell Inspired Antifouling Surface Morphology

Supervisors: Chengwang LEI , Kapil CHAUHAN

Thesis abstract:

�p�It is generally acknowledged that the shipping industry consumes most energy among the various transport industries, mainly due to its high-capacity and long-haul transportation across the oceans. Antifouling and drag reduction for marine vessels are two critical issues which significantly affect the efficiency, safety and reliability of shipping. Therefore, advanced technologies tackling these two issues are in high demand for achieving energy saving in the shipping industry. In terms of drag reduction, numerous studies about the performance of bionic surfaces have been reported in the literature. However, complicated by the impact of marine bio-fouling, it is meaningless to consider the isolated effect of drag reduction for hull surfaces. And due to the strong correlation between drag reduction and antifouling, it is important to investigate their synergistic behaviours. It has been reported in the literature that the riblet structure inspired by shark skin can reduce skin friction in the turbulent-flow regime by impeding near-wall turbulence fluctuation and vortex translation. It was also found that the biomimetic shell surface has distinct antifouling features compared to other biomimetic surfaces. Considering the similarity of the surface features between shark skin and shell, the potential of drag reduction with the bionic shell surface is expected. Therefore, if the drag reduction capacity of the bionic shell surface can be testified, it would be an innovative strategy to create an optimized biomimetic surface based on shell surface morphology, which combines both antifouling and drag reduction capacities. This dual-function engineering surface would be beneficial for not only shipping industries but also contributing to the energy saving at global level. In this article, the turbulent flow on a biomimetic shell surface will be studied by both simulation and experimental validation to predict the effect of biomimetic shell surface morphology on frictional resistance. And based on the results from simulation and experiments, the drag reduction mechanism will be discussed.�/p�

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