Abstract
Decaying turbulence in neutral and stratified fluids has been studied experimentally for relatively high mesh Reynolds numbers and long time-histories. The neutral case indicates an initial period decay law, q 2 ∝ t −1 , through non-dimensional time \[ W_gt/M \simeq 800 \] which is considerably longer than previous measurements at the same mesh Reynolds number ( Re = 48260). The stratified experiment resulted in a decay rate virtually identical to that of the neutral case through W g t / M = 275. However the decay rate sharply decreased after this time when the field of turbulence was replaced by internal gravity waves. A critical Richardson number marks the transition from the turbulence to an internal gravity wave domain.
Keywords
TurbulencePhysicsReynolds numberStratified flowsRichardson numberInternal waveStratified flowMechanicsK-epsilon turbulence model
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Publication Info
- Year
- 1980
- Type
- article
- Volume
- 99
- Issue
- 1
- Pages
- 13-31
- Citations
- 116
- Access
- Closed
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Cite This
Tommy D. Dickey,
George L. Mellor
(1980).
Decaying turbulence in neutral and stratified fluids.
Journal of Fluid Mechanics
, 99
(1)
, 13-31.
https://doi.org/10.1017/s002211208000047x
Identifiers
- DOI
- 10.1017/s002211208000047x