Backward Scatter of Subgrid-Scale Energy in Wall-Bounded and Free Shear Turbulence
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概要
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The energy exchange between the grid scale (GS) and the subgrid-scale (SGS) is investigated inlarge-eddy sixnulations (BES) of wall-bovxnded (fvxlly developed channel) and free shear' (rnixinglayer) turbtrlent flows. It is shown in the direct nurnerical simtnlation (DNS) data analysis thatthe forward and backward scatters of energy which arise are typically of' the S2lLl11(II; order ofmagnitude in both flows, with the net transfer being slightly fron? GS to SGS, but the backwardscatter is more pronotrnced in the mixing layer. A naechanisnn of the SGS energy generationis discussed in relation to the coherent structures. For the strbgrid-scale models, assessznent ismade of the eddy viscosity coefficient models and the scale-sinailarity rnodels, In correlationwith the DNS data, the scale-sinailarity model was shown to be naore accurate and capable ofrepresenting the backward scatter effect, while conctrrrently providing a drain of the GS energyinto SGS. The drawback of the previous scale-sinailarity model, however, was its overestirtaateof the backward scatter. A new scale-siuauilarity model that rectifies this drawback is proposed.These SGS rnodels were tested f'urther in acttral LES of the channel and mixing layer flows. Theresults were consistent with those of 'a priori' tests.
- 社団法人日本物理学会の論文
- 1997-01-15