期刊
JOURNAL OF TURBULENCE
卷 15, 期 6, 页码 386-410出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14685248.2014.910604
关键词
discrete conservation; skew-symmetric discretisation; large-eddy simulation; compressible flow; regularisation modelling
资金
- Ubbo Emmius Fund of the University of Groningen
Most simulation methods for compressible flow attain numerical stability at the cost of swamping the fine turbulent flow structures by artificial dissipation. This article demonstrates that numerical stability can also be attained by preserving conservation laws at the discrete level. A new mathematical explanation of conservation in compressible flow reveals that many conservation properties of convection are due to the skew-symmetry of the convection operator. By preserving this skew-symmetry at the discrete level, a fourth-order accurate collocated symmetry-preserving discretisation with excellent conservation properties is obtained. Also a new symmetry-preserving regularisation subgrid-scale model is proposed. The proposed techniques are assessed in simulations of compressible turbulent channel flow. The symmetry-preserving discretisation for compressible flow has good stability without artificial dissipation and yields acceptable results already on coarse grids. Regularisation does not consistently improve upon no-model results, but often compares favourably with eddy-viscosity models.
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