为了研究海扁虫摆动胸鳍时所产生的涡流特性以及波动推力，通过MATLAB的线性插值法重新建立了海扁虫胸鳍的简化模型，并推导出了海扁虫在游动时，推力、湍动能等参数之间的关系，最后利用Fluent软件对海扁虫的摆动姿态进行了模拟。结果表明：相较鳐鱼和牛鼻鲼等使用中对鳍（median paired fin, MPF）推进模式的鱼类，海扁虫因其窄长的身体结构特性，能够在水中表现出更好的稳定性、适应性及灵活性；当雷诺数设置为1.05×10⁵时，海扁虫胸鳍会表现出更稳定的推力，能够有效减少流体分离和湍流影响；在频率为0.6 Hz、波长为2.5m时，海扁虫胸鳍呈现出最优的摆动参数，提高了流体的混合和动力传递效率，进而提高了海扁虫的推进性能；在一个摆动周期的中期，胸鳍压强分布变化显著，在摆动的最高点时，升力效率最高。

In order to investigate the vortex characteristics and wave propulsion generated by the undulating pectoral fins of the flatworm, a simplified model of the flatworm's pectoral fin was re-established using the linear interpolation method in MATLAB. The relationship between thrust and kinetic energy, during the flatworm's swimming was derived, and the undulating posture of the flatworm was simulated using Fluent software. The results show that compared to similar MPF propulsion fish species such as rays and cownose rays, the flatworm, due to its narrow and elongated body structure, exhibits better stability, adaptability, and flexibility in water. When the Reynolds number is set to 1.05 × 10⁵, the pectoral fins of the flatworm demonstrates more stable thrust, effectively reducing flow separation and turbulence effects. At a frequency of 0.6 Hz and a wavelength of 2.5 m, the pectoral fins displays optimal undulating parameters, enhancing fluid mixing and energy transfer efficiency, thereby improving the flatworm's propulsion performance. It is concluded that, during the mid-phase of an undulation cycle, the pressure distribution on the pectoral fins changes significantly, with the lift efficiency being highest at the peak of the undulation.