Abstract
Numerical simulations using the RANS with the SSTk-ω turbulence model are performed to understand the flow feature of an underexpanded sonic jet from a convergent nozzle with a square cross-section of 1 mm × 1 mm at the nozzle exit. The nozzle pressure ratio, which is the ratio of the plenum pressure upstream of the nozzle to back pressure, is held constant at 4.0 and the Reynolds number based upon the flow properties and the height at the nozzle exit is 5.94 × 104. The near-field shock structure in shock-containing square jets is demonstrated with the three-dimensional representations of the magnitudes of the density and pressure gradient vectors.
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