Abstract
Currently, there are two models used in the direct numerical simulation (DNS) of transitional boundary layer flows: the spatial model and the temporal model. The spatial approach is the closest realization of a transition experiment, but is significantly more expensive than the temporal approach, which employs a local parallel flow assumption in its formulation. Due to the parallel flow assumption, a temporal approach cannot take into account the nonparallel effects of boundary layer flows properly. The consequence of this defect has never been addressed adequately. In this study, we first developed a new temporal approach, which can include some nonparallel effects in the computation. Second, we developed two spatial DNS codes, which make a quantitative comparison between temporal and spatial approaches possible. The comparison study has been carried out extensively for subharmonic transition and oblique wave breakdown at Mach numbers 1. 6 and 4. 5. The results from this study show that the use of this new formulation is essential in obtaining quantitative agreement with the spatial approach at high Mach numbers, while the standard temporal approach does not give satisfactory results.
| Original language | English |
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| State | Published - 1994 |
| Externally published | Yes |
| Event | AIAA Fluid Dynamics Conference, 1994 - Colorado Springs, United States Duration: 20 Jun 1994 → 23 Jun 1994 |
Conference
| Conference | AIAA Fluid Dynamics Conference, 1994 |
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| Country/Territory | United States |
| City | Colorado Springs |
| Period | 20/06/94 → 23/06/94 |