Abstarct: One of the major problems in the water and oil and gas industry is the production of solid sand particles along with the extraction process. The amount of solid particles produced in the extraction process can cause major problems such as erosion, pipe blockage and environmental problems. Erosion is a mechanical process in which the surface materials of the pipe are eroded by the collision of solid particles. Various parameters affect the erosion phenomenon, which can be summarized as particle size, particle velocity, solid particle shape, turbulence Flow and other things mentioned. In the present study, a comprehensive method for predicting erosion caused by solid particles baxsed on computational fluid dynamics in a 90 degree sharp elbow geometry has been performed. All the results obtained in the present numerical work have been validated with experimental results [1]. . First, to validate the present numerical work, erosion simulation is performed for a stable grid, and finally an appropriate turbulence model is selected to simulate erosion. The following is a comprehensive study of the grid used in geometry to predict erosion caused by fine solid particles. In this process, it is determined that the erosion caused by fine solid particles is significantly affected by the grid configuration . Finally, this research proposes a meshing strategy that has the ability to optimize the erosion caused by fine solid particles according to common numerical codes. The results show that different turbulence models can predict different results for erosion caused by fine solid particles and multiphase currents. Also, according to the obtained results, it can be said that in the situation that the changes in the flow field are independent of the mesh, the simulation results of erosion caused by solid particles can be directly affected by the network configuration in different parts of the elbow geometry.