دورية أكاديمية
Taylor's hypothesis in turbulent channel flow considered using a transport equation analysis
| العنوان: | Taylor's hypothesis in turbulent channel flow considered using a transport equation analysis |
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| المؤلفون: | Geng, CH, 何国威, Wang, YS, Xu, CX, Lozano-Duran, A, Wallace, JM, Geng, CH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. |
| سنة النشر: | 2015 |
| المجموعة: | IMECH-IR (Institute of Mechanics, Chinese Academy of Sciences) / 中国科学院力学研究所机构知识库 |
| مصطلحات موضوعية: | Mechanics, Physics, Fluids & Plasmas, NAVIER-STOKES EQUATIONS, CONVECTION VELOCITIES, ISOTROPIC TURBULENCE, REYNOLDS-NUMBER, SHEAR FLOWS, WALL FLOWS, STATISTICS, APPROXIMATION, APPLICABILITY, ACCELERATIONS, 一类/力学重要期刊 |
| الوصف: | Direct numerical simulations of turbulent channel flow at Re-tau = 205 and 932 have been carried out to examine Taylor's "frozen turbulence" hypothesis. The terms in Taylor's hypothesis appear in the transport equation for instantaneous momentum (Navier-Stokes) in this flow. The additional terms, i.e., the additional convective acceleration term and the pressure gradient and viscous force terms, act to diminish the validity of Taylor's hypothesis when they are relatively large compared to the Taylor's hypothesis terms and are not in balance. A similar analysis has been applied to the transport equation for instantaneous vorticity. The additional terms in this equation, namely, the additional convective rates of change of vorticity terms, the stretching/compression/rotation of vorticity terms, and the viscous diffusion of vorticity terms, similarly act to diminish the validity of Taylor's hypothesis when they are relatively large compared to the terms in the hypothesis and are not in balance. Where in the channel flow this diminishment occurs, and to what degree, and which of the non-Taylor's hypothesis terms in the momentum and vorticity equations contribute most to this diminishment are unraveled here. (C) 2015 AIP Publishing LLC. |
| نوع الوثيقة: | article in journal/newspaper report |
| اللغة: | English |
| العلاقة: | PHYSICS OF FLUIDS; Geng, CH,He GW,Wang, YS,et al. Taylor's hypothesis in turbulent channel flow considered using a transport equation analysis[J]. PHYSICS OF FLUIDS,2015,27(2):25111.; http://dspace.imech.ac.cn/handle/311007/49912Test; http://dx.doi.org/10.1063/1.4908070Test |
| DOI: | 10.1063/1.4908070 |
| الإتاحة: | https://doi.org/10.1063/1.4908070Test http://dspace.imech.ac.cn/handle/311007/49912Test |
| حقوق: | cn.org.cspace.api.content.CopyrightPolicy@1653f47 |
| رقم الانضمام: | edsbas.821D2E39 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1063/1.4908070 |
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