Large-eddy simulation of non-equilibrium inflow conditions and of the spatial development of a confined plane jet with co-flowing streams

Raddaoui, Maher; Chauve, Pascal; Wengle, Hans; Schiestel, Roland

doi:10.1016/b978-008043328-8/50018-7

Cited by 2 publications

(1 citation statement)

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“…The work of Shao shows that the usual diffusion modelling of turbulence leads to an underestimation of the transport term compared to experimental values. The simulation of the spatial development of the mixing layer allows to represent more closely the real flow, it has been studied by Meri et al [29]. Comparisons between LES and DNS results have also been made by Knaepen and Carati [22] using the mixed subgrid-scale model.…”

Section: Introductionmentioning

confidence: 98%

Non-Equilibrium Mixing of Turbulence Scales Using a Continuous Hybrid RANS/LES Approach: Application to the Shearless Mixing Layer

Befeno

Schiestel

2007

Flow Turbulence Combust

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A new subgrid-scale (SGS) model based on partially integrated transport method (PITM) is applied to the case of a turbulent spectral non-equilibrium flow created by the mixing of two turbulence fields of differing scales: the shearless mixing layer. The method can be viewed as a continuous hybrid RANS/LES approach. In this model the SGS length scale is no longer given by the size of the discretization step, but is dynamically estimated using an additional transport equation for the dissipation rate. The results are compared to those corresponding to the classical model of Smagorinsky and to the experimental data of Veeravalli and Warhaft. A method for creating an anisotropic analytical pseudo-random field for inflow conditions is also proposed. This approach based on subgrid-scale transport modelling combined with anisotropic inlet conditions gives better results for the prediction of the shearless mixing layer.

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Section: Introductionmentioning

confidence: 98%