Numerical simulation of flow with large eddy simulation at Re = 3900

Niaz B. Khan (School of Mechanical and Manufacturing Engineering, National University of Sciences and Technology, Islamabad, Pakistan)
Zainah B. Ibrahim (Department of Civil Engineering, University of Malaya, Kuala Lumpur, Malaysia)
Mian Ashfaq Ali (School of Mechanical and Manufacturing Engineering, National University of Sciences and Technology, Islamabad, Pakistan)
Mohammed Jameel (Department of Civil Engineering, King Khalid University, Abha, Saudi Arabia)
Muhammad Ijaz Khan (Department of Mathematics, Quaid-I-Azam University, Islamabad, Pakistan)
Ahad Javanmardi (Department of Civil Engineering, University of Malaya, Kuala Lumpur, Malaysia)
D.O. Oyejobi (Department of Civil Engineering, University of Ilorin, Ilorin, Nigeria)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Publication date: 24 June 2019

Abstract

Purpose

Over the past few decades, the flow around circular cylinders has been one of the highly researched topics in the field of offshore engineering and fluid-structure interaction (FSI). In the current study, numerical simulations for flow around a fixed circular cylinder are performed at Reynolds number (Re) = 3900 with the LES method using the ICEM-CFD and ANSYS Fluent tool for meshing and analysis, respectively. Previously, similar studies have been conducted at the same Reynolds number, but there have been discrepancies in the results, particularly in calculating the recirculation length and angle of separation. In addition, the purpose of this study is to address the impact of time interval averaging to obtain the fully converged solution.

Design/methodology/approach

This study presents the LES method, using the ICEM-CFD and ANSYS fluent tool for meshing and analysis.

Findings

In the current study, turbulence statistics are sampled for 25, 50, 75 and 100 vortex-shedding cycles with the CFL value O (1). The recirculation length, angle of separation, hydrodynamic coefficients and the wake behind the cylinder are investigated up to ten diameters. The drag coefficient and Strouhal number are observed to be less sensitive, whereas the recirculation length appeared to be highly dependent on the average time statistics and the non-dimensional time step. Similarly, the mean streamwise and cross-flow velocity are observed to be sensitive to the average time statistics and non-dimensional time step in the wake region near the cylinder.

Originality/value

In the current investigation, turbulence statistics are sampled for 25, 50, 75 and 100 vortex-shedding cycles with the CFL value O (1), using large eddy simulation method at Re = 3900 around a circular cylinder. The impact of time interval averaging to obtain the fully converged mean flow field is addressed. No such consideration is yet published in the literature.

Keywords

Citation

Khan, N., Ibrahim, Z., Ali, M., Jameel, M., Khan, M., Javanmardi, A. and Oyejobi, D. (2019), "Numerical simulation of flow with large eddy simulation at Re = 3900", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/HFF-11-2018-0619

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Emerald Publishing Limited

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