Fig. 1. POD reconstruction of wavefront

Fig. 2. Turret model. (a) Model; (b) size

Fig. 3. Oil flow and streamlines. (a) Front view; (b) side view; (c) top view

Fig. 4. Mach number and iso-surface of Q value. (a) Mach number; (b) surface of Q value

Fig. 5. Statistical analysis of wavefront variation. (a) Time mean value; (b) PV value; (c) RMS

Fig. 6. Variation of wavefront. (a) With steady aberrations; (b) without steady aberrations

Fig. 7. Former 10 order modals of wavefront

Fig. 8. Variation of wavefront parameters with time. (a) P_V; (b) R_MS,OPD

Fig. 9. Variation of far field spot parameters with time. (a) Deflection angle; (b) SR