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- W2276043251 abstract "An experimental study of localized disturbances in plane Poiseuille flow is presented and the main focus is on the nonlinearityies of localized (laminar) disturbances. Measurements of the streamwise disturbance velocity are carried out with a hot-wire technique at a Reynolds number of 1600. The set-up is arranged so that two localized disturbances are interacting to form a composite disturbance (CD). They are generated a distance of 50 half channel heights apart so that the second disturbance strikes the primary one when this has reached its peak energy. The second disturbance is introduced with a smaller amplitude. Subtracting the individual disturbances from the CD the nonlinear interaction (NI) is extracted, directly relating the amplitudes between the two of them. Perturbing the front of the primary disturbance keeps the motion lasting for longer times than perturbing somewhere else on the centreline. In addition, it is found that the NI of the centre of the structure in general appears in connection with large velocity gradients in the streamwise and spanwise directions of the disturbances. At the outer regions of the CD the NI followed the negative amplitudes of the velocity, shown in Fig. 1. The relatively large amplitudes of the NI suggests that the disturbances are of a nonlinear type rather than linear, but with laminar characteristics (i.e. deterministic behaviour). Moreover, the findings reveal that there is a threshold value (for the jet-velocity emanating from the wall) for the developing disturbances. Exceeding the pivotal jet-velocity the disturbances evolve entirely from the strongly nonlinear front. Else, they die out relatively quickly due to the lack of the strongly nonlinear initial stage (triggering)." @default.
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- W2276043251 date "1996-01-01" @default.
- W2276043251 modified "2023-10-04" @default.
- W2276043251 title "Nonlinear Interaction of Laminar Three-Dimensional Disturbances in Plane Poiseuille Flow" @default.
- W2276043251 doi "https://doi.org/10.1007/978-94-009-0297-8_93" @default.
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