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- W2100085525 abstract "A direct numerical simulation of the o w around a swept cylinder in the presence of a micro-roughness array has been performed. The roughness elements are placed periodically in the spanwise direction and their heigth is equal to one tenth of the boundary layer thickness. The aim of the simulation is to compute the amplitude of the crosso w instability waves generated within the laminar boundary layer by the presence of the roughness array. Results show that both a steady and an unsteady instability waves are generated, even if the roughness forcing is purely steady. A linear stability analysis based on the OrrSommerfeld equations is used to characterize these waves. The unsteady one is the traveling crosso w wave which is the most amplied according to this theory. The steady one must be distinguished from the roughness-induced response. This can be done with help of the biorthogonal decomposition method developed by Tumin and extended in this work to a swept boundary layer. This method is also a way to evaluate precisely the receptivity coecien ts. This has been done for both the unsteady and the steady crosso w waves. The results obtained for the steady crosso w wave should be considered with caution, since the non-parallel and curvature eects, not taken into account yet in the decomposition method, may be signican t for this specic zero frequency." @default.
- W2100085525 created "2016-06-24" @default.
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- W2100085525 date "2007-06-15" @default.
- W2100085525 modified "2023-09-27" @default.
- W2100085525 title "Direct Numerical Solution of the Crossflow Instabilities Induced by a Periodic Roughness Array on a swept cylinder: receptivity and stability investigations" @default.
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- W2100085525 doi "https://doi.org/10.2514/6.2007-3976" @default.
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