Investigation of high-order methods in large-eddy simulation of separated flow in a channel with periodic constrictions
Résumé
In large-eddy simulations (LES), only the dynamics of large scales is computed
and the effect of smaller scales is modelled. Scale separation is however difficult to
establish since the low-pass filtering arises from a complex combination of implicit
filtering by the grid and the discretization schemes. Evenwhen explicit filtering is performed,
the implicit filtering due to the application of discretizationmethods changes
the shape of the filter function.
The principal objective of the current study is to identify the sensitivity of the predictive accuracy to resolution
and modelling issues. Simulations were performed for six different finite-difference
schemes, six explicit filters and five subgrid-scalemodels on a coarse grid. It is shown
in particular that the dissipative part of the discretization scheme plays a determinant
role and overwhelms the choice of a SGS closure.
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