WSEAS Transactions on Fluid Mechanics
Print ISSN: 1790-5087, E-ISSN: 2224-347X
Volume 20, 2025
Numerical Investigation of Turbulent Flow around an Obstacle:
Effects of Inclination Angle on Flow Dynamics
Authors: , ,
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Abstract: This paper proposes a numerical study of a turbulent flow around an inclined square obstacle in a channel. The objective of this work is to examine the effect of the obstacle inclination (θ) on the boundary layer separation. The two-dimensional unsteady Reynolds-averaged Navier-Stokes equations (2D-URANS) were solved by the finite volume method using the shear stress transport k- model ((SST-(k-ω)) for turbulence closure. Validation is carried out with available experimental data and large eddy simulation (LES) results of the no inclined case (θ=0∘). Six obstacle inclinations in the range 0∘ ≤θ≤45 ∘, for Reynolds number Re=3000, are examined. The results show that the Strouhal number (St) increases linearly until it reaches a maximum value (St = 0.145) for a critical angle (θ = 15°), then decreases below this value.
Keywords:
Obstacle inclination, Von Kármán vortex shedding, Strouhal Number, CFD, Finite volume method, Turbulence
Pages: 189-197
DOI: 10.37394/232013.2025.20.19