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- W4294681503 abstract "We employ a recently introduced structured input-output analysis (SIOA) approach to analyze streamwise and spanwise wavelengths of flow structures in stably stratified plane Couette flow. In the low-Reynolds number ($Re$) low-bulk Richardson number ($Ri_b$) spatially intermittent regime, we demonstrate that SIOA predicts high amplification associated with wavelengths corresponding to the characteristic oblique turbulent bands in this regime. SIOA also identifies quasi-horizontal flow structures resembling the turbulent-laminar layers commonly observed in the high-$Re$ high-$Ri_b$ intermittent regime. An SIOA across a range of $Ri_b$ and $Re$ values suggests that the classical Miles-Howard stability criterion ($Ri_bleq 1/4$) is associated with a change in the most amplified flow structures when Prandtl number is close to one ($Prapprox 1$). However, for $Prll 1$, the most amplified flow structures are determined by the product $PrRi_b$. For $Prgg 1$, SIOA identifies another quasi-horizontal flow structure that we show is principally associated with density perturbations. We further demonstrate the dominance of this density-associated flow structure in the high $Pr$ limit by constructing analytical scaling arguments for the amplification in terms of $Re$ and $Pr$ under the assumptions of unstratified flow (with $Ri_b=0$) and streamwise invariance." @default.
- W4294681503 created "2022-09-06" @default.
- W4294681503 creator A5051253792 @default.
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- W4294681503 date "2022-09-05" @default.
- W4294681503 modified "2023-09-27" @default.
- W4294681503 title "Structured input–output analysis of stably stratified plane Couette flow" @default.
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- W4294681503 doi "https://doi.org/10.1017/jfm.2022.648" @default.
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