Research on Self-Propelled Motion of Bionic Fish by CFD-PID Method
Underwater bionic propulsion has several advantages over traditional propeller propulsion methods,such as flexibility,efficiency,and less environmental impact.In this paper,on the basis of solving the incompressible N-S equation and Newton's second law,the PID control algorithm is embedded,and the CFD-PID solver is constructed to simulate the self-propelled motion of the bionic fish under active control.The speed of the bionic fish is indirectly controlled by dynamically adjusting the foil amplitude through a PID controller,allowing it to achieve any specific convergence velocity.Compared with conventional self-propulsion,PID-controlled self-propulsion can accelerate to a predetermined velocity faster,generate larger-scale vortices during the acceleration period,and achieve a dynamic equilibrium state that is consistent with conventional self-propulsion.
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