Development of inflow turbulence in microscale urban atmospheric environment
| Autor: | Haifeng Li, Zhaoshun Zhang, Guixiang Cui |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
Characteristic length Field (physics) Turbulence Applied Mathematics Mechanical Engineering Reynolds stress Inflow Atmospheric sciences 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics Mechanics of Materials Physics::Space Physics 0103 physical sciences Turbulence kinetic energy Environmental science Diffusion (business) Microscale chemistry 0105 earth and related environmental sciences |
| Zdroj: | Applied Mathematics and Mechanics. 38:1377-1396 |
| ISSN: | 1573-2754 0253-4827 |
| DOI: | 10.1007/s10483-017-2247-6 |
| Popis: | The sensitivity of turbulence-development to inflow turbulent statistics is investigated in microscale urban atmospheric environment flows. Large-eddy simulations (LESs) are carried out, in which the inflow error is brought in by transforming a fully developed turbulent field according to the Reynolds stress or energy spectra. A theoretical analysis is performed by neglecting the diffusion term in the budget equations of the turbulent kinetic energy. The results show that, (i) the error caused by the Reynolds stress decays until the fully developed level is achieved, and (ii) the error caused by the characteristic length scale increases immediately and then decreases. The streamwise changing rate of the inflow error weakens when the vertical coordinate increases. Further testing of the effects of the inflow inner- and outer-layer data shows that, the inflow inner-layer data dominate the near field, and the inflow outer-layer data dominate the far field. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|