Abstract
High-amplitude freestream disturbances, as well as surface roughness elements, trigger streamwise oriented vortices and streaks of varying amplitudes in laminar boundary layers, which can lead to secondary instabilities and ultimately to transition to turbulence. In this project we aim at deriving and testing a control algorithm based on the adjoint compressible boundary region equations, which are obtained in the assumption that the streamwise wavenumber of the disturbances is much smaller the the crossflow wavenumbers. In our control algorithm, the wall transpiration velocity represents the control variable, whereas the wall shear stress or the vortex energy designates the cost functional. We anticipate the optimal control of the streamwise vortices approach to lessen vortex energy and subsequently cause a delay of the occurrence of transition from laminar to turbulent flow. Here, we report the progress on the project.
Original language | English |
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Number of pages | 2 |
Publication status | Published - 28 Oct 2020 |
Event | Seventeenth International Conference on Flow Dynamics - Virtual Conference and Tohoku University, Sendai, Japan Duration: 28 Oct 2020 → 30 Oct 2020 http://www.ifs.tohoku.ac.jp/icfd2020/ |
Conference
Conference | Seventeenth International Conference on Flow Dynamics |
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Abbreviated title | ICFD17 2020 |
Country/Territory | Japan |
City | Sendai |
Period | 28/10/20 → 30/10/20 |
Internet address |
Keywords
- active control
- boundary layer control
- Transition modeling