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| Effects Of Subgrid-Scale Modeling On Lagrangian Statistics In Large-Eddy Simulation | |
Yang Y(杨越); He GW(何国威) ; Wang LP; He, GW (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China.
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| Source Publication | Journal of Turbulence
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| 2008 | |
| Pages | 1-24 |
| ISSN | 1468-5248 |
| Abstract | The application of large-eddy simulation (LES) to turbulent transport processes requires accurate prediction of the Lagrangian statistics of flow fields. However, in most existing SGS models, no explicit consideration is given to Lagrangian statistics. In this paper, we focus on the effects of SGS modeling on Lagrangian statistics in LES ranging from statistics determining single-particle dispersion to those of pair dispersion and multiparticle dispersion. Lagrangian statistics in homogeneous isotropic turbulence are extracted from direct numerical simulation (DNS) and the LES with a spectral eddy-viscosity model. For the case of longtime single-particle dispersion, it is shown that, compared to DNS, LES overpredicts the time scale of the Lagrangian velocity correlation but underpredicts the Lagrangian velocity fluctuation. These two effects tend to cancel one another leading to an accurate prediction of the longtime turbulent dispersion coefficient. Unlike the single-particle dispersion, LES tends to underestimate significantly the rate of relative dispersion of particle pairs and multiple-particles, when initial separation distances are less than the minimum resolved scale due to the lack of subgrid fluctuations. The overprediction of LES on the time scale of the Lagrangian velocity correlation is further confirmed by a theoretical analysis using a turbulence closure theory. |
| Keyword | Homogeneous Isotropic Turbulence Relative Diffusion Settling Velocity Time Correlations Particle Motion Heavy-particles Fluid Particles Channel Flow Dispersion |
| DOI | 10.1080/14685240801905360 |
| URL | 查看原文 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000253860600001 |
| WOS Keyword | HOMOGENEOUS ISOTROPIC TURBULENCE ; RELATIVE DIFFUSION ; SETTLING VELOCITY ; TIME CORRELATIONS ; PARTICLE MOTION ; HEAVY-PARTICLES ; FLUID PARTICLES ; CHANNEL FLOW ; DISPERSION |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/26112 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | He, GW (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China. |
| Recommended Citation GB/T 7714 | Yang Y,He GW,Wang LP,et al. Effects Of Subgrid-Scale Modeling On Lagrangian Statistics In Large-Eddy Simulation[J]. Journal of Turbulence,2008:1-24. |
| APA | 杨越,何国威,Wang LP,&He, GW .(2008).Effects Of Subgrid-Scale Modeling On Lagrangian Statistics In Large-Eddy Simulation.Journal of Turbulence,1-24. |
| MLA | 杨越,et al."Effects Of Subgrid-Scale Modeling On Lagrangian Statistics In Large-Eddy Simulation".Journal of Turbulence (2008):1-24. |
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