Enhanced Delayed DES of shock wave/boundary layer interaction in a planar transonic nozzle
| Autor: | G. Della Posta, Emanuele Martelli, Matteo Bernardini, Fulvio Stella, Pietro Paolo Ciottoli |
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| Přispěvatelé: | Posta, G. Della, Martelli, E., Ciottoli, P. P., Stella, F., Bernardini, M. |
| Rok vydání: | 2018 |
| Předmět: |
Fluid Flow and Transfer Processes
Shock wave Physics Turbulence Mechanical Engineering Nozzle Condensed Matter Physic 02 engineering and technology Mechanics detached eddy simulation Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Shock (mechanics) Physics::Fluid Dynamics Boundary layer 020303 mechanical engineering & transports 0203 mechanical engineering overexpanded nozzle shock wave/boundary layer interaction 0103 physical sciences Detached eddy simulation Reynolds-averaged Navier–Stokes equations Transonic |
| Zdroj: | Proceeding of THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer. |
| DOI: | 10.1615/thmt-18.740 |
| Popis: | An enhanced delayed detached eddy simulation of a shock wave/boundary layer interaction in an over-expanded planar transonic nozzle has been carried out to predict the fundamental features of shock low-frequency unsteadiness. The modification of the sub-grid length-scale proposed in Shur et al. (2015) has been implemented to attenuate some well-known problems of detached eddy simulation: the modeled-stress depletion in the switch region between RANS and LES and the consequent delay of transition to turbulence at the onset of separation. The comparison of the computational results with the experimental data shows that the enhanced DDES leads to significant improvements in the estimation of some flow features with respect to a different DDES version, even though some discrepancies are still observable in the distribution of the mean wall pressure, and additional work is needed to further improve the transition from modeled to resolved turbulence. |
| Databáze: | OpenAIRE |
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