Reprint of: Influence of corner geometry on the secondary flow in turbulent square ducts
Vidal A, Vinuesa R, Schlatter P, Nagib HM (2017)
Publication Type: Journal article
Publication year: 2017
Journal
Book Volume: 67
Pages Range: 94-103
DOI: 10.1016/j.ijheatfluidflow.2017.09.011
Abstract
Direct numerical simulations of fully-developed turbulent flow through a straight square duct with increasing corner rounding radius r were performed to study the influence of corner geometry on the secondary flow. Unexpectedly, the increased rounding of the corners from r=0 to 0.75 does not lead to a monotonic trend towards the pipe case of r=1. Instead, the secondary vortices relocate close to the region of wall-curvature change. This behavior is connected to the inhomogeneous interaction between near-wall bursting events, which are further characterized in this work with the definition of their local preferential direction. We compare our results with those obtained for the flow through a square duct (which corresponds to r=0) and through a round pipe (r=1), focusing on the influence of r on the wall-shear stress distribution and the turbulence statistics along the centerplane and the corner bisector. The former shows that high-speed streaks are preferentially located near the transition between straight and curved surfaces. The Reynolds numbers based on the centerplane friction velocity and duct half-height are Re
Authors with CRIS profile
Involved external institutions
Indian Institute of Technology (IIT) Gandhinagar
India (IN)
Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH)
Sweden (SE)
India (IN)
Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH)
Sweden (SE)
How to cite
APA:
Vidal, A., Vinuesa, R., Schlatter, P., & Nagib, H.M. (2017). Reprint of: Influence of corner geometry on the secondary flow in turbulent square ducts. International Journal of Heat and Fluid Flow, 67, 94-103. https://doi.org/10.1016/j.ijheatfluidflow.2017.09.011
MLA:
Vidal, A., et al. "Reprint of: Influence of corner geometry on the secondary flow in turbulent square ducts." International Journal of Heat and Fluid Flow 67 (2017): 94-103.
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