Swirl switching in turbulent flow through 90° pipe bends
| Autor: | Emma Alenius, Christian Carlsson, Laszlo Fuchs |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Plug flow Turbulence Oscillation Mechanical Engineering Flow (psychology) Computational Mechanics Mechanics Low frequency Condensed Matter Physics Curvature Open-channel flow Pipe flow Physics::Fluid Dynamics Classical mechanics Mechanics of Materials Physics::Accelerator Physics |
| Zdroj: | Physics of Fluids. 27:085112 |
| ISSN: | 1089-7666 1070-6631 |
| Popis: | Turbulent flow through 90° pipe bends, for four different curvatures, has been investigated using large eddy simulations. In particular, the origin of the so-called swirl switching phenomenon, which is a large scale oscillation of the flow after the bend, has been studied for different bend curvature ratios. A classification of the phenomenon into a high and a low frequency switching, with two distinct physical origins, is proposed. While the high frequency switching stems from modes formed at the bend, and becomes increasingly important for sharp curvatures, the low frequency switching originates from very-large-scale motions created in the upstream pipe flow. |
| Databáze: | OpenAIRE |
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