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Effect of incoming boundary layer thickness on the flow dynamics of a square finite wall-mounted cylinder.
- Source :
- Physics of Fluids; Jan2022, Vol. 34 Issue 1, p1-27, 27p
- Publication Year :
- 2022
-
Abstract
- This paper investigates the flow dynamics around a square finite wall-mounted square cylinder of two different aspect ratios (A R = H / D = 6 and 10, H and D are the height and width, respectively) under six boundary layer thickness ( δ / D = 0.5 – 4.0 , δ is the boundary layer thickness) using the improved delayed detached eddy simulation turbulence model. The Reynolds number based on the square cylinder width and incoming velocity is Re = 1.4 × 10 4 . The aerodynamic force, surface mean and fluctuating pressure, wake closure length, Reynolds stresses, turbulence production, and the anisotropy of turbulence are analyzed in detail to investigate the effect of A R and δ / D combinations. The Q-criterion vortex identification method is adopted to identify and classify the vortex structures of different A R and δ / D combinations. The parametric diagram based on A R and δ / D to predict the dipole/quadrupole wake structure proposed in Yauwenas et al. ["The effect of aspect ratio on the wake structure of finite wall-mounted square cylinders," J. Fluid Mech. 875, 929–960 (2019)] is refined based on results of the present study (quadrupole wake for A R = 6 with δ / D ≥ 1.5 and A R = 10 with δ / D ≥ 1.0). The instantaneous space–time pressure distribution along the whole span proves the existence of cellular shedding (A R = 10 for δ / D = 0.5 – 2.0), and the spectral proper orthogonal decomposition technique is adopted to investigate the cellular shedding phenomenon and its distribution. With the increase in δ / D from 2.0 to 4.0, the cellular shedding process is absent, implying the inhibitory effect of increasing boundary layer thickness on the cellular shedding. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10706631
- Volume :
- 34
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Physics of Fluids
- Publication Type :
- Academic Journal
- Accession number :
- 154998952
- Full Text :
- https://doi.org/10.1063/5.0076541