Self-similar mixing in stratified plane Couette flow for varying Prandtl number
نویسندگان
چکیده
منابع مشابه
Turbulence, mixing and Prandtl number effects in stratified plane Couette flows
We report direct numerical simulations (DNS) of stratified plane Couette (SPC) flows in both continuous and layered stratifications for a wide range of Prandtl number Pr from 0.7, 7 to 70. In the continuously stratified set-up, Pr has a significant impact on the momentum and heat fluxes across the flow. Variations of these fluxes then modifies the turbulence characteristics in the way that is c...
متن کاملCoherent structures in stably stratified plane Couette flow
A large body of recent work in wall-bounded, unstratified shear flow has been dedicated to finding Exact Coherent Structures (ECS) (e.g. see the review Kawahara et al. (2012)). These are fully non-linear, invariably unstable, exact solutions which help understand how turbulence arises. The growing consensus is that the existence of these solutions is a necessary (but not sufficient) condition f...
متن کاملA Numerical Study of Turbulent Stably-Stratified Plane Couette Flow
Direct numerical simulations (DNS) of stably-stratified, turbulent plane Couette flow are currently being performed on the XC-4000. The friction Reynolds number is kept approximately constant, Reτ 540 and the Richardson number Riw varies between 0 and 0.1. The flow is divided into two regions: the region close to the wall and the core region. The region close to the wall presents strong velocit...
متن کاملThe effect of vortex pairing and Prandtl number on mixing in moderate Reynolds number stratified flows
Mixing resulting from Kelvin-Helmholtz instability is studied by direct numerical simulations for an intermediate Reynolds number in stratified flows where vortex pairing occurs. We investigate how the interaction of several billows changes the mixing properties. Simulations in a long domain show that only considering the interaction of two billows overestimates the amount of mixing and mixing ...
متن کاملLayer Formation in Stratified Taylor–Couette Flow
A new set of high Reynolds number experiments (Re = riΩi∆r ν ∼ 10 − 10) are conducted to examine the layer formation observed in stratified Taylor–Couette flow. A wider range of radius ratios η = ri ro (where ri and ro are the radii of the inner and outer cylinder, respectively) than previously possible is explored to examine the universality of the dependence of layer height l on U N , where U...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2017
ISSN: 0022-1120,1469-7645
DOI: 10.1017/jfm.2017.200