Evaluation of eddy- and non-eddy-viscosity subgrid scale models in stratified turbulence

Abstract eng:
This paper presents a detailed study on the performance of eddy- and non-eddy-viscosity subgrid scale (SGS) models using direct numerical simulations (DNS) of decaying stratified turbulence, when two types of test filters – the Gaussian and sharp spectral filters – are applied. It is shown that non-eddy-viscosity models yield very good results when a Gaussian filter is applied. On the other hand, the eddy-viscosity models show less dissipative results when the spectral filter is applied. Overall, this study provides a strong support for the choice of minimum grid spacing in eddy- and non-eddy-viscosity SGS parameterizations using theoretical scale analysis and DNS data.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket