NSMB Validation Cases

Shock–shock interaction

Unsteady interaction between the bow shocks of two offset blunt bodies, compared directly with the experimental flow visualisation.

Matched field of view

Experiment and NSMB, aligned for comparison

The bodies occupy the same visual positions in both frames, making the bow-shock curvature, interaction region and downstream wakes easier to compare directly.

Experimental greyscale flow visualisation of interacting shocks around two offset spherical bodies — Experimental flow visualisation used as the spatial reference.

NSMB

Six unsteady NSMB states shown with the original scalar-field colour palette.

Solver history

Residual and boundary convergence

Normalized L2 residue and far-field boundary movement over the recorded time steps.

Convergence history for the shock-shock interaction showing far-field boundary movement and normalized L2 residue — The flow residual settles after the main transient while the moving far-field boundary reaches its lower convergence level earlier.

Conclusion

Comparable interaction topology

The aligned views expose the same defining topology: two detached bow shocks, their interaction between the bodies, and the paired downstream wakes. This is a qualitative flow-structure comparison, supported by the solver convergence history rather than a claim of pixel-for-pixel agreement.