In:
Physics of Fluids, AIP Publishing, Vol. 33, No. 2 ( 2021-02-01)
Abstract:
The present study analyzes the transport characteristics and associated instability of a forced convective flow past a semi-circular cylinder at incidence with a downstream circular cylinder. Considering air as an operating fluid, unsteady computations are performed for the ranges of incidence angles ϕ and Reynolds numbers (Re) (0° ≤ ϕ ≤ 90°, 60≤Re≤160). The numerical model is adequately validated with the available experimental and numerical data from the literature. It is found that the presence of the upstream semi-circular cylinder at various incidence angles yields a rotational effect on the flow structures that evolve from the downstream circular cylinder. The modulation of the incidence angle reveals three separation regimes of the shed-vortex structures, which shows wake confluence. The dependencies of the coefficient of drag CD and the root mean square values of the lift coefficient CL,rms on the angles of incidence are examined for both of the cylinders. The frequency of vortex shedding increases with increasing ϕ and attains its peak value at ϕ ∼ 30°. The forced convective heat transfer for the semi-circular cylinder decreases with increasing ϕ, whereas a contrasting trend is observed for the circular cylinder until ϕ ∼ 45°. The global stability analysis through the dynamic mode decomposition shows a stabilizing flow situation for the present range of operating parameters.
Type of Medium:
Online Resource
ISSN:
1070-6631
,
1089-7666
Language:
English
Publisher:
AIP Publishing
Publication Date:
2021
detail.hit.zdb_id:
1472743-2
detail.hit.zdb_id:
241528-8
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