Dynamic Modeling and Numerical Analysis of Biomimetic Robotic Fish Based on Computational Fluid Dynamics

The development of biomimetic robotic fish has garnered significant interest from robotics specialists and engineers due to its ability to achieve silent, highly agile, and efficient underwater mobility. Nevertheless, accurately examining the dynamic properties of this underwater flexible robot that is associated with a fluid-structure remains a difficult task. In this paper, the biomimetic robotic fish was analyzed using computational fluid dynamics methods, which involved creating a three-dimensional model and employing dynamic mesh techniques. Dynamic modeling, numerical simulation, and analysis were then conducted on the robotic fish. The findings indicate that there is no straightforward direct relationship between the tail beat frequency and the swimming speed of the biomimetic robotic fish. The post-processing software analysis of the fish’s pressure distribution cloud map and vortex cloud map demonstrates the persistent positive pressure features on the head of the biomimetic robotic fish and the alterations in the vortex around the caudal fin during the steady propulsion operation. These findings offer valuable insights for the advancement of underwater biomimetic technologies and a more comprehensive comprehension of the effective movement mechanism of fish in hydrodynamics.