Abstarct: It is difficult to predict the erosion of cavitation in the workpieces because it should be placed in laboratory and work conditions and observations should be made after a long period of operation and testing, which is very time consuming and, in some cases, impossible to design the design. This is why computational fluid dynamics are used to provide quick and affordable access to design goals. The purpose of this study was to evaluate the sensitive erosion areas during the incubation period in cavitation streams. So far, no research has been done on cavitation erosion models, and none of the models comprehensively and completely capable of responding to any geometric and flow conditions. Among all these models, the microjet hypothesis seems to be more efficient than the rest of the models. In this study, using a new cavitation erosion model derived from the Dular and Coutier-Delgosha microjet model, the implementation of the numerical code of this model in a numerical solution of the phase-shift current in open source open source codes with the object's C++ programming language A powerful tool baxsed on computational fluid dynamics has been developed to predict areas with high erosion rates on the walls of computational domain geometry. This numerical code can be used to estimate the eroded areas and the severity of erosion in those areas. This model uses cavitation flow solving information to predict the occurrence of microjet in the flow. For numerical code validation and its ability to predict erosion of cavitation, a standard nozzle with a 90-degree numerical modeling and its results are compared with the available experimental results. And then examines the effect of flow parameters and geometry on erosion. Finally, it is concluded that erosion of cavitation with flow parameters can be justified. The microjet model is one of the successful numerical models in predicting erosion of cavitation. The LES modified model is more efficient than numerical modeling compared to the k-ωSSt modified model. As the Reynolds number increases and the flow velocity increases, the inflow into the nozzle generally decreases the intensity of erosion at a point and occurs more in area, and the same location of erosion changes on the walls.