Numerical Simulation Of Turning Characteristic Of Batoid Based On CFD

In numerous kinds of fish, batoid as the representative of the pectoral fin-propelledfish are characterized by maneuverability which adapted to the complex underwaterenvironment. Nowadays, study on batoid is still less at home and abroad, especiallystudy on turning movement whcich effects its maneuverability greatly. In order tostudying the turning movement of batoid deeply，This paper will highlight real batoid asa prototype, to carry out simulation of its turning motion.This paper establishes entity model, kinematics model and dynamic model ofbatoid. We uses means of numerical simulation to realize batoid turning in the water byFluent software. We extract the parameters of hydrodynamic performance which affectbatoid’s turning movement, and the parameters are analyzed and compared. We haveobtained the turning trajectory which is real batoid by means of simulations. Thesimulation and real batoid compared to prove the correctness of the model andsimulation.In this paper, the control variable method is used to research batoid turning bychanging the frequency and the amplitude of pectorals of batoid. we take severaldifferent sets of both sides frequency pectorals to achive batoid’s turning. Whensimulation in each group have achive a turning, we extract parameters which have aneffect on hydrodynamic performance when batoid turn. The parameters were comparedand analyzed to get the frequency which make batoid an excellent performance. In thesame way, we study how the amplitude of pectoral impacts batoid’s turning, and get theamplitude which make batoid an excellent performance.In order to have a further investigate how the frequency and amplitude affectbatoid’s turning, we will carry out combining the frequency with amplitude, and takemultiple sets of composite parameters to conduct our simulations. When each groupachieving a turn, we took the complex hydrodynamic performance parameters and theparameters under univariate comparison,and the result showed that the hydrodynamicperformance of turning by composite parameters is much better than the univariate case.