BlockMesh drill down challenge

Objective: Here are the courant numbers obtained after doing with grading 0.2,0.5,0.8. 0.0899,0.3204 and 0.4981 respectively Plots obtained ffrom the three grading meshes are almost similar so theres not much change with that. Kinematic viscocity to be taken as 1e-5 Conclusion is that the accuracy is better in 0.2 graded mesh when…