Abstract
Researchers Pay more and more attention to the biomimetic underwater propulsive technologies,especially to the research on the robotic fish.To improve the performances of the propulsion system based on long flexible undulating fin,a method of combination of caudal fin and long flexible fin is proposed.The propulsive model of long flexible undulating fin and the propulsive model of composite fin are introduced.Comparison and analysis of the results obtained by using a two-dimensional computational fluid dynamics method for rigid caudal fin oscillating model and for long flexible undulating model are emphasized.Experiments which use a simplified particle image velocity method are done for better understanding the fluid mechanism and validating the simulation results.It provides the foundation for further research on the performance of this propulsive system.
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