Abstract
A new version of RANS/LES hybrid method with the entropy function fs as the blending function is proposed to avoid the dependence on the grid. Three test cases including supersonic turbulent boundary-layer flow, supersonic cavity-ramp flow and supersonic base flow are chosen to evaluate its performance. The results of the original detached-eddy simulation (DES97) are also included for comparison. It shows that turbulent boundary-layer region is reliably denoted by fs for both attached and separated flows. Compared by the results of DES97, the modeled stress depletion (MSD) phenomenon induced by refined grid is largely suppressed without loss of LES content after massive separation. Moreover, fs is deduced from the point of energy dissipation, independent of any particular turbulent quantities. That is, this entropy function could be utilized by other RANS/LES strategies.
Original language | English |
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Pages (from-to) | 1950-1955 |
Number of pages | 6 |
Journal | Tuijin Jishu/Journal of Propulsion Technology |
Volume | 38 |
Issue number | 9 |
DOIs | |
Publication status | Published - 1 Sept 2017 |
Keywords
- Computational fluid dynamics
- Detached-eddy simulation
- Entropy
- Hybrid method