<p>Cavitation and cavitation erosion are prevalent phenomena in hydraulic machinery. In the present paper, a multiscale Eulerian-Lagrangian method in OpenFOAM is used to simulate cavitating flow in a Venturi tube. Additionally, a novel erosion prediction model is proposed, incorporating material hardening behavior under impact loads caused by asymmetric bubble collapse near walls. The model couples detailed bubble dynamics with the nonlinear plastic response of materials, enabling direct calculation of erosion pit depth. Simulation results show strong agreement with experimental erosion patterns, confirming the feasibility of this new method. The proposed method is pivotal for further studying how various materials respond to cavitation wear.</p>