| Autor: |
Agbakaja, Casimir Uchenna, Kiono, Berkah Fajar Tamtomo, Rozi, Khoiri |
| Předmět: |
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| Zdroj: |
International Research Journal of Innovations in Engineering & Technology; Jul2023, Vol. 7 Issue 7, p1-11, 11p |
| Abstrakt: |
This study deals with the flow investigation of a backward-facing incline step using the RANS turbulence model (SKD κ-εand SKD κ-ω) with angle 5°,10° and 15°. The Reynolds number used are 17,500 and 30,000. The motivation for this research stems from the fact that in aerodynamics analysing, the flow over an inclined step will enable us in understanding the features of the rear wake. A great amount of the energy necessary to propel the airfoil gets dissipated by vortex shedding generated in the rear, so it is of paramount importance to understand the properties of the wake. In this paper, the flow over a backward step is analysed and the results are compared with existing scholarly literature for validation. Attention was paid specifically to the separation region behind the step and the shear layer relaxation after the reattachment in the downstream part of the channel. The influence of Reynolds number, expansion ratio and turbulence intensity on flow separation and reattachment was investigated and obtained for various step angles using the SKD κ-εand SKD κ -εmodel and it was observed that the SKD κ -εpredict recirculation better than the SKD κ-εmodel with about 0.1 percent. In conclusion, the upstream boundary layer plays a decisive role in flow separation and reattachment. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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