Direct Numerical Simulation of Air Heated Cylinder Wake in Transitional State. Part I: Cylinder Heating Effect on Strong Turbulence Anisotropy (STA), and Determination of STA Suppression
| Autor: | Katsuhisa Noto |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Physics
Numerical Analysis Richardson number Turbulence Direct numerical simulation Reynolds number Laminar flow Mechanics Wake Condensed Matter Physics Computer Science Applications Physics::Fluid Dynamics symbols.namesake Classical mechanics Mechanics of Materials Modeling and Simulation symbols Cylinder Anisotropy |
| Zdroj: | Numerical Heat Transfer, Part B: Fundamentals. 66:43-76 |
| ISSN: | 1521-0626 1040-7790 |
| DOI: | 10.1080/10407790.2014.894446 |
| Popis: | A variation of strong turbulence anisotropy (STA) with cylinder heating, and, as a result, STA suppression, are here first elucidated in the air heated wake in the transitional state at Reynolds number Re = 300 and Richardson number Ri = 0.3. Simultaneously, new facts for variations of velocities u, v, and w, i.e., the upward, horizontal, and spanwise directions, and wake motion by cylinder heating are first elucidated. Here STA is defined such that, in velocities u, v, and w, laminar velocities arise in at least one directions but turbulence arises in the remainder of directions. 1. STA is determined to arise in isothermal and heated wakes by employing the new method. With cylinder heating, STA is found to be suppressed because the turbulent region in w is decreased, the three-dimensionality is suppressed, but the two-dimensionality and laminarization are enhanced in the heated wake. 2. With cylinder heating, the spanwise velocity |w| is found to be suppressed strongly in the probability density function... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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