.png){kind=icon}
返回
Minimum-dissipation models for large-eddy simulation
.png){kind=icon}
OA
AI
DOI：10.1063/1.4928700.png)
.png){kind=icon}
.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
Minimum-dissipation eddy-viscosity models are a class of sub-filter models for large-eddy simulation that give the minimum eddy dissipation required to dissipate the energy of sub-filter scales. A previously derived minimum-dissipation model is the QR model. This model is based on the invariants of the resolved rate-of-strain tensor and has many desirable properties. It appropriately switches off for laminar and transitional flows, has low computational complexity, and is consistent with the exact sub-filter tensor on isotropic grids. However, the QR model proposed in the literature gives insufficient eddy dissipation. It is demonstrated that this can be corrected by increasing the model constant. The corrected QR model gives good results in simulations of decaying grid turbulence on an isotropic grid. On anisotropic grids the QR model is not consistent with the exact sub-filter tensor and requires an approximation of the filter width. It is demonstrated that the results of the QR model on anisotropic grids are primarily determined by the used filter width approximation, and that no approximation gives satisfactory results in simulations of both a temporal mixing layer and turbulent channel flow. A new minimum-dissipation model for anisotropic grids is proposed. This anisotropic minimum-dissipation (AMD) model generalizes the desirable practical and theoretical properties of the QR model to anisotropic grids and does not require an approximation of the filter width. The AMD model is successfully applied in simulations of decaying grid turbulence on an isotropic grid and in simulations of a temporal mixing layer and turbulent channel flow on anisotropic grids. (C) 2015 AIP Publishing LLC.
Keyword:
TURBULENT CHANNEL FLOW
SYMMETRY-PRESERVING DISCRETIZATION
TENSOR
AI总结
对已上传原文的论文进行重点信息的提取，主要内容包括：简要概述、研究摘要、背景介绍、关键亮点、图文解析、展望与总结。
期刊
IF:
4.3
论文数:
2.9W
被引数:
8.0W
机构
引用论文
Using singular values to build a subgrid-scale model for large eddy simulations.png)
PHYSICS OF FLUIDS
OAAI
PHYSICS OF FLUIDSIF4.3
OAAI分享收藏Decaying turbulence in an active-grid-generated flow and comparisons with large-eddy simulation
PREAI
分享收藏A numerical study of self-similarity in a turbulent plane wake using large-eddy simulationPHYSICS OF FLUIDS
PHYSICS OF FLUIDSIF4.3
PREAI
分享收藏
查看更多内容