Direct numerical simulation of a turbulent 90° bend pipe flow

Wang Z, Orlu R, Schlatter P, Chung YM (2018)

Publication Type: Journal article

Publication year: 2018

Journal

International Journal of Heat and Fluid Flow Elsevier

Book Volume: 73

Pages Range: 199-208

DOI: 10.1016/j.ijheatfluidflow.2018.08.003

Abstract

Direct numerical simulation (DNS) has been performed for a spatially developing 90° bend pipe flow to investigate the unsteady flow motions downstream of the bend. A recycling method is implemented to generate a fully-developed turbulent inflow condition. The Reynolds number of the pipe flow is ReD=5300 and the bend curvature is γ=0.4. A long straight pipe section (40D) is attached in the downstream of the bend to allow the flow to develop. Flow oscillations downstream of the bend are measured using several methods, and the corresponding oscillation frequencies are estimated. It is found that different characteristic frequencies are obtained from various flow measurements. The stagnation point movement and single-point velocity measurements may not be good measures to determine the swirl-switching frequency. The oscillations of the lateral pressure force on the pipe wall and half-sided mass flow rate are proposed to be a more unambiguous measure of the unsteady flow motions downstream of the bend.

Authors with CRIS profile

Philipp Schlatter

Involved external institutions

University of Warwick GB United Kingdom (GB) Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH) SE Sweden (SE)

How to cite

APA:

Wang, Z., Orlu, R., Schlatter, P., & Chung, Y.M. (2018). Direct numerical simulation of a turbulent 90° bend pipe flow. International Journal of Heat and Fluid Flow, 73, 199-208. https://doi.org/10.1016/j.ijheatfluidflow.2018.08.003

MLA:

Wang, Zhixin, et al. "Direct numerical simulation of a turbulent 90° bend pipe flow." International Journal of Heat and Fluid Flow 73 (2018): 199-208.

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