“…The instantaneous vorticity shows that it is produced at the inlet plug and the back-step where the §ow enters the combustor and then propagates downstream to the axisymmetric expansion where its scale is changed and it interacts with the incoming fuel and, subsequently, the wall. (1), heat release (2), axial velocity (3), and vorticity (4) §uctuations throughout the oxidizer post and combustion chamber at a series of times over one period [14] Figure 8 shows a composite plot of the acoustic pressure, vorticity §uctuation, instantaneous heat release, and axial velocity in the injector post/combustor combination (note that vorticity and axial velocity §uctuations have been scaled to be comparable with pressure and heat release §uctuations). These results have been obtained from the hybrid RANS/LES calculations, ¦ltered at the ¦rst longitudinal (1L) mode, down-sampled, and cycle-averaged to show conditions at 28 equally spaced time intervals over one acoustic cycle.…”