Two different types of instantaneous wall boundary conditions have been proposed for resolved large scale simulations that extend inside the viscous sublayer. These conditions transfer the physical no-slip and impermeability/permeability information,which can only be rigorously applied to the unfiltered variables,to the filtered variables. The first condition is universal,while the second one specifies the wall stress and relevant distribution and can be used to treat inverse flow problems. The filter scale close to the wall is a function which varies according to its position and thus the problem of the noncommutation of the filter and differentiation operators arises. Used together with the explicit noncommutation procedure by Iovieno and Tordella,these boundary conditions constitute a wall treatment which could improve the use of the large-eddy methodology in relation to aspects that are independent of the modeling of the subgrid scale motion. When applied in the test case of the plane periodic channel,intentionally using the most crude subgrid scale model (Smagorinsky,with no dynamic procedure or wall damping function) to prove its efficacy,the proposed near-wall treatment yielded resolved large-eddy simulations which compare well with both direct numerical simulations and with experimental data. The effects of the Reynolds number on the structure of the flow are retained. Distributions of the noncommutation error on the turbulent solution are also reported.
|Titolo:||A new large-eddy simulation near-wall treatment|
|Data di pubblicazione:||2004|
|Digital Object Identifier (DOI):||10.1063/1.1783371|
|Appare nelle tipologie:||1.1 Articolo in rivista|