Abstract
Results from two unsteady, turbulent flow computations using a hybrid Reynolds-averaged Navier–Stokes/large-eddy-simulation turbulence model are presented. One computation deals with flow in a complex rocket-engine cooling manifold and the other with a simpler T-junction flow. Results from the T-junction flow computations show that, for a for a critical flow velocity in the side branches, an acoustic resonance is excited. The reduced velocity at resonance was found to be in the range 1.5 to 1.7, which is in good agreement with experimental measurements. In addition, the pressure profile exhibits a node on the axis of the T junction with antinodes of opposite signs in the side branches. For the rocket-engine cooling manifold, results show that vortex shedding and pressure fluctuations within the manifold significantly influence the stability of shear layers and flow through exit cooling tubes. In some cooling tubes near the inflow region, the shear layer blocks the entrance to the tubes, whereas in some other regions, flow reversal is observed.
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