Week 8 - Simulation of a backward facing step in OpenFOAM

Conclusion

1.The plot without the GF(grading factor=1) seems to be more accurate & smoother than the plot with GF=0.2. Hence, we can observe that when the mesh is not uniform, it can disrupt our output results to some extent. Grading factor actually helps us to adjust the sizes of the respective cells from the initial section of the block to the final section of that block.

2. Mesh-grid needs to be finer in order to capture the flow properties with better accuracy as shown in the plot with GF=1 as the mesh is uniform at all section.

3. With the grading factor of 0.2 we can notice that the flow quantities were captured well at grid points nearer to the wall where the mesh is coarse and hence resolution of the velocity with mesh-grading have more accuracy compared to when there's no grading.

4. We can observe from the simulation that when the fluid is going to from inlet towards outlet, the area increases and as the area increases, the velocity profile decreses.