Flow reversals in thermally driven turbulence
WebApr 21, 2015 · After a flow reversal, the odd modes, e.g., (1, 1) and (3, 1), switch sign, but the even modes, e.g., (2, 2), retain their sign. The mixed modes (1, 2) and (2, 1) fluctuate around zero. Using the properties of the modes and their interactions, we show that they form a Klein four-group Z2 × Z2. WebThese corner-flow rolls play a crucial role for the large-scale wind reversal: They grow in kinetic energy and thus also in size thanks to plume detachments from the boundary …
Flow reversals in thermally driven turbulence
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WebJul 16, 2010 · Flow reversals in thermally driven turbulence Phys Rev Lett. 2010 Jul 16;105(3) :034503. doi ... We analyze the reversals of the large-scale flow in Rayleigh … WebRayleigh-Bénard convection (RBC), a fluid layer heated from below and cooled from above, is an ideal model for the study of thermally driven turbulent flows ( 5 – 7 ). The main challenge for thermal turbulence studies is to explore the flow dynamics and heat transfer of the system in a wide range of the control parameters.
WebFeb 27, 2024 · The phenomenology of RBC should apply to other flows where the buoyancy feeds the kinetic energy, e.g. bubbly turbulence and fully-developed Rayleigh Taylor instability. This paper also covers several models that predict the Reynolds and Nusselt numbers of RBC. Web2 days ago · It is found that the flow reversal can be promoted at a Rayleigh number around 10⁷. ... We describe the spectral theory including energy flux and show that the thermally-driven turbulence is ...
WebFlow Reversals in Thermally Driven Turbulence Kazuyasu Sugiyama, 1,3 Rui Ni, 2 Richard J.A.M. Stevens, 1 Tak Shing Chan, 1,2 Sheng-Qi Zhou, 2 Heng-Dong Xi, 2 … WebFeb 21, 2024 · Sugiyama K, Ni R Stevens R J A M, et al. Flow reversals in thermally driven turbulence. Phys Rev Lett, 2010, 105: 034503. Article Google Scholar Zhang Y, Huang Y X, Jiang N, et al. Statistics of velocity and temperature fluctuations in two-dimensional Rayleigh-Bénard convection. Phys Rev E, 2024, 96: 023105
Web•Dynamically driven flowsproduced by the interaction of the large-scale flow with topography •Thermally driven flows(a.k.a. diurnal mountain winds) produced by horizontal contrasts in heating and cooling that arise from topographic and land-surface contrasts •Frequently combined to some extent This Lecture Thermally Driven Mountain Winds
WebVarious models have recently been developed to describe Arctic coastal erosion. Current process-based models simulate multiple physical processes and combine them interactively to resemble the unique mechanism of Arctic coastal erosion. One limitation of such models is the difficulty of including hydrodynamic forces. The available coastal erosion models … curcumin phytosome meriva 500 benefitsWebNov 10, 2024 · Here, α, ν, and k are the thermal expansion coefficient, kinematic viscosity, and thermal diffusivity of the fluid, respectively; Δ is the temperature difference across the fluid layer of height H; and g is the gravitational acceleration. Pervious studies 7–9 7. R. H. Kraichnan, “ Turbulent thermal convection at arbitrary Prandtl number,” Phys. Fluids 5, … curcumin pills walmartWebPDF - We analyze the reversals of the large-scale flow in Rayleigh-Benard convection both through particle image velocimetry flow visualization and direct numerical simulations of … curcumin pills benefitsWebApr 18, 2024 · For buoyancy-driven turbulence with stable stratification, ... We, however, remark that the recent thermal convection simulations in a cube [57,58] exhibit flow reversals for a set of parameters. Hence, we … easy egg foo young recipeWebAs examples for turbulent flow where buoyancy is important and at the same time can easily be tuned, we take thermal convection, namely Rayleigh–Bénard (RB) ... Our … curcumin pills doctors bestWebSep 16, 2016 · Emergence of substructures inside the large-scale circulation induces transition in flow reversals in turbulent thermal convection. Journal of Fluid Mechanics, … easy egg drop projectsWebCentrifugal-Force-Induced Flow Bifurcations in Turbulent Thermal Convection Article Dec 2024 Hu Yunbing Shi-Di Huang Yi-Chao Xie Ke-Qing Xia An important and unresolved issue in rotating... easy egg free cupcakes