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Delayed detached eddy simulation of the end-effect regime and side-loads in an overexpanded nozzle flow

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Abstract

The separated flow in an overexpanded nozzle featuring a restricted shock separation is investigated numerically using delayed detached eddy simulation and compared with the experimental data of Nguyen et al. (Int J Flow Turbul Combust 71(1):161–181, 2003). First, the enormous cost of a Large Eddy Simulation for such a nozzle flow is assessed before being performed to motivate the practical need for using an hybrid RANS/LES method. The calculation is then used to investigate the “end-effect” regime which involves a strong global unsteadiness with very large amplitude fluctuations of about 15–20% of nozzle divergent length. The flow regime is characterized by high wall pressure fluctuations which are hopefully nearly axisymmetric. The main properties (rms levels, amplitude of displacement of the separation) of the motion are rather well reproduced by DDES compared to the experiment. However, a major difference lies in the frequency of the computed motion which is higher than in the experiment. This major discrepancy is currently not explained by the author. The properties of the side-loads are also briefly discussed.

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  1. Applied Aerodynamics Department, ONERA, 8 rue des Vertugadins, 92190, Meudon, France

    Sébastien Deck

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  1. Sébastien Deck
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Correspondence to Sébastien Deck.

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Communicated by A. Hadjadj.

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Deck, S. Delayed detached eddy simulation of the end-effect regime and side-loads in an overexpanded nozzle flow. Shock Waves 19, 239–249 (2009). https://doi.org/10.1007/s00193-009-0199-5

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  • DOI: https://doi.org/10.1007/s00193-009-0199-5

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