To address the problem of contact between the slender rods and tubes immersed in fluid， a numerical method is estab lished to model the coupling vibration and collision between slender rotating rods and the produced fluid， based on the overset mesh technique. The outer annulus fluid domain is divided into two overset subregions： a background mesh and a component mesh. The interpolation formula is derived to transfer fluid field boundary information in each overset region. The subdomain method is used to solve the coupling between the produced fluid domain and the rod solid domain. Additionally， the transfer method of physical vari ables and a normalized convergence criterion are established for the coupling interface. A coupling simulation device for a vertical ro tating rod and produced fluid is established， and the numerical simulation results are compared with experimental results to validate the correctness of the numerical method presented in this paper. The coupled vibration and collision characteristics between the slen der rods and tubes are studied under different fluid viscosities and rotational velocities. The results show that as fluid viscosity in creases， the influence of viscous resistance on the motion of the rod becomes more pronounced， leading to lower contact pressure and reduced vibration. As the rotational speed of the rod increases， the vibration becomes more intense， the influence of torsional deformation on the rod’s motion becomes more significant， the normal acceleration during collision decreases， and the contact pres sure decreases accordingly. When the collision occurs between the rods and tubes， the acceleration at each point of the rod changes abruptly， and the vibration intensity increases.