This lesson covers the process of refining a mesh in Ansys Fluent® fluid simulation software to ensure accurate results. The lesson delves into the visualization of the oblique shock and the discretization in that region. The mesh is then refined in the shock region to improve the discretization and reduce computational intensity. The lesson concludes with running the calculation on the refined mesh and visualizing the improved oblique shock. The lesson provides a practical example of refining a mesh in Ansys Fluent® to improve the accuracy of results.