Erosion dynamic grid coupling method for predicting silt wear characteristics of water turbine

The invention provides an erosion dynamic grid coupling method for predicting sand wear characteristics of a mixed-flow water turbine, and relates to the technical field of hydroelectric generation. The erosion dynamic grid coupling method for predicting the sand wear characteristic of the mixed-flow water turbine comprises the following steps that firstly, a whole flow channel from a volute inlet of the mixed-flow water turbine to a draft tube outlet is divided through a polyhedral mixed unstructured grid, and then steady-state N-S equation calculation is conducted on a continuous phase through an SSTk-omega turbulence model; steady-state particle tracking is adopted for the sediment particle dispersed phase under the Lagrange framework; according to the method, the influence of gravity and drag force is considered for sediment particles, a Grant model is adopted for particle rebound, wall surface abrasion is calculated in combination with an Oka model, wall surface deformation caused by sediment erosion is