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- W3131303323 abstract "The paper considers a two-dimensional flow in a channel, which consists of straight inlet and outlet branches and a circularly curved bend. An incompressible viscous fluid flows through the elbow under the action of a constant pressure gradient between the inlet and outlet. Navier-Stokes equations were solved numerically using a high-fidelity spectral/hp element method. In a range of Reynolds numbers, an adaptive selective frequency dumping method was used to get a steady-state flow. It was found that separation bubbles and vortex shedding can exist in the bend. The instability of the three-dimensional linear perturbations is investigated. It was found that the critical numbers of the two-dimensional disturbances according to the linear approach are much greater than those of three-dimensional ones, but the two-dimensional flow is unstable with respect to the perturbations of finite amplitude. White noise can be amplified by two-dimensional nonlinear mechanisms at relatively small Reynolds numbers, and a nonlinear instability scenario is realized that competes with the linear instability of three-dimensional perturbations. This way of instability development is characterized by the formation of a two-dimensional vortices sequence, where the amplitude varies along the channel in a quasi-periodic manner." @default.
- W3131303323 created "2021-03-01" @default.
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- W3131303323 date "2021-02-22" @default.
- W3131303323 modified "2023-09-27" @default.
- W3131303323 title "Linear stability of flow in a 90-degree bend" @default.
- W3131303323 hasPublicationYear "2021" @default.
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