Turbulent flow over a swept backward-facing step

Kaltenbach, Hans-Jakob

doi:10.1016/j.euromechflu.2003.10.015

Cited by 14 publications

(5 citation statements)

References 27 publications

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“…The influence area on the downstream is increased obviously by downward flow from the step trailing edge. This phenomenon match the experimental result in Ref [8][9]. Figure7 shows the profiles of pressure isolines for different sweep angles at different z values along the x direction.…”

supporting

confidence: 89%

Numerical Investigation of Three-Dimensional Flow over a Swept Backward-Facing Step Using a Multi-Scale Turbulence Model

Yang

Shao

et al. 2013

AMM

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Using a multiscale model based on the variable interval time average method and a set of averaged equations for incompressible turbulent flows, we simulate the three-dimensional separated and reattaching flow over a swept backward-facing step. The results show that the reattachment length and vortex structure vary with the swept angles from 15° to 60° through a detailed study about velocity profile and pressure distribution. Generally the reattachment length and span wise vorticity decrease dramatically after =30°. The result fully accord with experimental data. Results show that this model is suitable for separated flows, and accurately predict the flow field, so this model should be useful in engineering application.

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supporting

confidence: 89%

Numerical Investigation of Three-Dimensional Flow over a Swept Backward-Facing Step Using a Multi-Scale Turbulence Model

Yang

Shao

et al. 2013

AMM

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“…The flow upstream of the step was laminar and shear-layer transition took place prior to reattachment. Further, Kaltenbach (2004) used Large Eddy Simulation to study turbulent flow over a swept backward facing step when Res = 5000 and for a range of swept angles. The configuration studied was the same as presented in Kaltenbach and Janke (2000).…”

mentioning

confidence: 99%

A numerical investigation of laminar flow over a backward facing inclined step

2015

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Aquesta és una còpia de la versió author's final draft d'un article publicat a la revista Meccanica.La publicació final està disponible a Springer a través de http://dx.doi.org/10.1007/s11012-015- This is a copy of the author 's final draft version of an article published in the journal Meccanica. The aim of the present study is to analyze the two dimensional flow over a backward-facing-inclined step in laminar flow regime. The inspiration for the present work is derived from the fact that in automobile industry, analyzing the flow over an inclined step shall help in understanding the characteristics of the rear vehicle wake. A considerable percentage of the energy needed to propel the vehicle is dissipated by the vorticity generated in the rear of the vehicle, hence it is of utmost importance to understand the properties of the wake. In the present paper, the flow over a backward step is initially analyzed and the results are compared with the existing literature to validate the code developed. The inclined step simulations were carried out by varying different aspects of the geometry i.e. different tilts, several upstream lengths and a range of different Reynolds numbers. Critical Reynolds numbers for vortex shedding in the wake of different step inclinations have been analyzed for all cases studied. A discussion on the time-averaged drag and lift coefficients as a function of Reynolds number and for all cases undertaken, are among the results presented. Among the conclusions, it is particularly interesting to point out that the inclination angle of 15º was found to be the critical angle for vortex shedding, after which critical Reynolds number remains constant.

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“…In regions above the plume, the flow approaches the BFS under an angle with the centerplane. The study by Kaltenbach [60] shows that the streamline reattachment length downstream of a BFS rotated by 40°about a vertical axis reduces to 5.5 step heights, which further supports this assumption. Additionally, the flow is pushed towards the wall since the CRVP secondary flow adds a vertical component to the flow near the BFS.…”

Section: Effect Of a Bfs On The Mean Flowmentioning

confidence: 53%

“…For the studied cases, the BFS modifies the turbulent structure of the flow at about 15 to 16 times the step height downstream of the step. However, streamline reattachment at the centerplane occurs at a distance of 4 to 5 step heights, which is relatively close compared to undisturbed BFS wakes [59,60]. This might be explained by the secondary flow induced by the CRVP interacting with the BFS wake.…”

Section: Effect Of a Bfs On The Mean Flowmentioning

confidence: 82%