| Autor: |
Gandía-Barberá, Sergio, Hoyas, Sergio, Oberlack, Martin, Kraheberger, Stefanie |
| Předmět: |
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| Zdroj: |
Physics of Fluids; 2018, Vol. 30 Issue 4, pN.PAG-N.PAG, 4p, 1 Chart, 6 Graphs |
| Abstrakt: |
The length and width of the long and wide structures appearing in turbulent Couette flows are studied by means of a new dataset of direct numerical simulation covering a stepped transition from pure Couette flow to pure Poiseuille one, at Reτ ≈ 130, based on the stationary wall. The existence of these structures is linked to the averaged Reynolds stress, u v ¯ : as soon as in any part of the channel u v ¯ changes its sign, the structures disappear. The length and width of the rolls are found to be, approximately, 50h and 2.5h, respectively. For this Reynolds number, simulations with a domain shorter than 100h cannot properly describe the behaviour of the longest structures of the flow. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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