Figure 4


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Snapshots in the (z,r) plane of temperature fluctuations in the flow and of pressure fluctuations outside for (a) L = 15r0, (b) L = 20r0, (c) L = 25r0 and (d) L = 30r0. The red arrows show the wavefronts of two consecutive upstream-propagating pressure waves for the nozzle-to-plate distances L = 15r0 and 25r0. The color scales range from 0 to 780K for temperature, from red to white, and from −2000 to 2000 Pa for pressure, from black to white.

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