Wave dispersion in moderate channel turbulence
Peer reviewed, Journal article
Published version
Permanent lenke
https://hdl.handle.net/11250/3099632Utgivelsesdato
2023Metadata
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- Institutt for marin teknikk [3473]
- Publikasjoner fra CRIStin - NTNU [38672]
Sammendrag
We study channel turbulence by interpreting its vorticity as a random sea of ocean wave packet analogues. In particular, we investigate the ocean-like properties of vortical packets applying stochastic methods developed for oceanic fields. Taylor’s hypothesis of frozen eddies does not hold when turbulence is not weak, and vortical packets change shape as they are advected by the mean flow, altering their own speed. This is the physical manifestation of a hidden wave dispersion of turbulence. Our analysis at the bulk Reynolds number Reb = 5600 suggests that turbulent fluctuations behave dispersively as gravity-capillary waves, with capillarity being dominant near the wall region.