Three-dimensional features in non-equal and opposing flow junctions
| Autor: | Sharareh Mahmodinia, Mitra Javan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Turbulence Mechanical Engineering 0208 environmental biotechnology Computational Mechanics 02 engineering and technology Mechanics 01 natural sciences 020801 environmental engineering Physics::Fluid Dynamics Borda–Carnot equation Solid mechanics Streamlines streaklines and pathlines Clockwise 0105 earth and related environmental sciences Communication channel |
| Zdroj: | Acta Mechanica. 229:4357-4374 |
| ISSN: | 1619-6937 0001-5970 |
| DOI: | 10.1007/s00707-018-2242-z |
| Popis: | The main aim of the present study is to simulate three-dimensional features in equal and non-equal opposing flow junctions. In order to achieve this, the three-dimensional unsteady Reynolds-averaged Navier–Stokes equations are solved with the $$k{-}\varepsilon $$ turbulence model on a non-staggered grid using the indirect addressing treatment. The overall agreement is good between the predictions and the measurement data. Three-dimensional streamlines capture the helical trajectory of particles inside two separation and two stagnation zones. The complex interaction is observed between two stagnation zones so that some particles travel from one stagnation zone to the other. Counter-clockwise and clockwise secondary circulations exist at the branch channel of the opposing flow junctions. The ratio of two upstream main channels discharge affects the size of separation and stagnation zones and shear layers in the opposing flow junctions. One of the secondary circulations located at the branch channel decays due to the discharge ratio variation. The contraction coefficient slightly increases with decreasing discharge ratio in non-equal and opposing flow junctions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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