Summary
The paper addresses the predictive capabilities of different computational modelling practices which employ various eddy-viscosity models for turbulence, that are based on a linear, a quadratic and two cubic representations of the Reynolds stress tensor in terms of strain and vorticity rates respectively, in the context of a comparative study between Reynolds-Averaged Navier-Stokes Equations and Large Eddy Simulation of vortex-shedding flows. The test case considered here refers to the familiar vortex-shedding flow past a square cylinder at Re = 22.000 studied experimentally by Lyn et al.. All the models were found to reproduce fairly well the shedding dynamics with the exception of eddy-viscosity models employed with a high rate of oncoming turbulence. The total kinetic energy was fairly well predicted by all models, whereas the turbulent part was significantly underestimated. Comparison of this latter quantity has emphasized the effective role of turbulence anisotropy in rendering the effects of shedding mechanisms. The integral parameters were determined with much better agreement with measurements than the averaged quantities. The essential finding is that the explicit algebraic stress models predict much better the global parameters with increasing the order of anisotropy. The confusing results of Large Eddy Simulation, i.e. satisfactory agreements of the time-averaged velocity and energy profiles to the expense of a less accurate prediction of the global coefficients, did not support the superiority of the concept. Still, the practice has revealed a particular sentivity to the near-wall treatment.
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Lakehal, D., Thiele, F., de Lageneste, L.D., Buffat, M. (1998). Computation of Vortex-Shedding Flows Past a Square Cylinder Employing LES and RANS. In: Hirschel, E.H. (eds) Numerical Flow Simulation I. Notes on Numerical Fluid Mechanics (NNFM), vol 66. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-44437-4_13
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DOI: https://doi.org/10.1007/978-3-540-44437-4_13
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