Swirling-strength based large eddy simulation of turbulent flow around single square cylinder at low Reynolds numbers

doi:10.1007/s10483-014-1847-7

Abstract

Abstract: In view of the fact that large scale vortices play the substantial role of momentum transport in turbulent flows, large eddy simulation (LES) is considered as a better simulation model. However, the sub-grid scale (SGS) models reported so far have not ascertained under what flow conditions the LES can lapse into the direct numerical simulation. To overcome this discrepancy, this paper develops a swirling strength based the SGS model to properly model the turbulence intermittency, with the primary characteristics that when the local swirling strength is zero, the local sub-grid viscosity will be vanished. In this paper, the model is used to investigate the flow characteristics of zero-incident incompressible turbulent flows around a single square cylinder (SC) at a low Reynolds number range Re ∈ [10³, 10⁴]. The flow characteristics investigated include the Reynolds number dependence of lift and drag coefficients, the distributions of time-spanwise averaged variables such as the sub-grid viscosity and the logarithm of Kolmogorov micro-scale to the base of 10 at Re = 2 500 and 10⁴, the contours of spanwise and streamwise vorticity components at t = 170. It is revealed that the peak value of sub-grid viscosity ratio and its root mean square (RMS) values grow with the Reynolds number. The dissipation rate of turbulent kinetic energy is larger near the SC solid walls. The instantaneous factor of swirling strength intermittency (FSI) exhibits some laminated structure involved with vortex shedding.

Key words: large scale vortex, lift and drag coefficient, turbulence intermittency, swirling strength

2010 MSC Number:

Zuo-jin ZHU;Jian-lei NIU;Ying-lin LI. Swirling-strength based large eddy simulation of turbulent flow around single square cylinder at low Reynolds numbers. Applied Mathematics and Mechanics (English Edition), 2014, 35(8): 959-978.

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