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Zonal Detached Eddy Simulation (ZDES) study of a 3D curved duct

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.400
pages 365-368

R. Laraufie
ONERA - The French Aerospace Lab, F-92190, Meudon, France

Sebastien Deck
Department of Applied Aeronautics ONERA - The French Aerospace Lab F-92190, Meudon, France


Intake integration in missiles or combat aircrafts is a key issue for stealth enhancement and performance optimization. That is the reason why S-shaped duct geometries are more and more favoured. Such a solution allows indeed an overall vehicle size reduction, while shielding the engine face from direct observations. On the other hand, the complexity of the flow field increases dramatically and usually involves flow separation and instabilities development. In practice, this leads directly to pressure loss and flow distortion, detrimental to the engine performance.
The ability to accuratly predict the dynamics of the turbulent flow becomes essential for designers. In such a case, the need of a LES resolution in regions where the flow field is driven by turbulent instabilities, while computational ressources are limited, motivates the use of a hybrid RANS/LES approach. The lower (U)RANS grid resolution needs, compared to LES, are indeed desirable in the near wall region, or where resorting to turbulence modeling has no consequence for the purpose of a given study.
The flow of a rectangular-shaped cross section duct, investigated in the S19Ch wind tunnel of ONERA [3], is proposed to be studied by means of the Zonal Detached Eddy Simulation (ZDES) [1]. The four mode ZDES makes possible to set up the right amount of turbulence modeling in the different parts of the calculation. This zonal strategy permits to focus the computational resources in the regions of interest. In the mean time, the overall calculation cost is kept as low as possible. The problem of turbulence content injection, at (U)RANS (ZDES mode 0) to WMLES (ZDES mode III) transition, is addressed by means of the Dynamic Forcing Method, combined with a simple white noise, as in references [4, 5].

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