Abstract
Extensive research to establish an index of roughness that causes abrupt turbulent transition downstream of the roughness and affect natural laminar flow is performed. This study investigates turbulent transitions dominated by the roughness-induced crossflow instability on a swept wing and a swept flat plate. Direct numerical simulations (DNS) are performed considering the swept wing to determine the critical roughness height that induces abrupt turbulent transition. Compared to its no-roughness counterpart, the roughness increases both the pressure drag and skin-friction drag and decreases the lift owing to the onset of upstream turbulence. The wind tunnel tests are performed considering a swept flat-plate boundary-layer model. The development of turbulent regions due to the roughness is investigated. The results reveal the occurrence of a laminar-to-turbulent transition and relaminarization, along the boundary between laminar and localized turbulent regions. Moreover, the DNS results reveal the generation of traveling crossflow vortices from the localized turbulent region.
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Acknowledgements
The authors thank Dr. M. Ueno for valuable insights during the analysis of the NASA-CRM wing as well as Dr. Y. Aoki (JAXA) and Mr. O. Hamamura (IHI Aerospace Engineering) for extending their support during the wind tunnel tests. Moreover, the authors thank Dr. H. Abe (JAXA), Dr. H. Mamori (The University of Electro-Communications), and Dr. Y. Kametani (Meiji University) for extending their support and providing insight during development of our incompressible-fluid DNS code. Finally, the authors thank Dr. Y. Ide (JAXA) for the fruitful discussions concerning the instabilities observed in the three-dimensional boundary-layer flow. The wind tunnel test was performed with the cooperation of the JAXA Aeronautical Facility Research Unit. The compressible-fluid DNS analyses were performed using the computational resources of the JAXA Supercomputer System—generations 2 and 3 (JSS2 and JSS3).
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An earlier version of this paper was presented at APISAT 2021, Jeju, South Korea, in November 2021.
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Ishida, T., Ohira, K., Hosoi, R. et al. Numerical and Experimental Analysis of Three-Dimensional Boundary-Layer Transition Induced by Isolated Cylindrical Roughness Elements. Int. J. Aeronaut. Space Sci. 23, 649–659 (2022). https://doi.org/10.1007/s42405-022-00485-0
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DOI: https://doi.org/10.1007/s42405-022-00485-0