Flow reversals in thermally driven turbulence

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August undefined, 2024

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 … WebSpontaneous and stochastic reversal of large scale flow structure is an intriguing and crucial phenomenon in turbulent Rayleigh-Bénard type natural convection. This paper proposes a new control approach to eliminate the reversals through stabilising the corner flows using two small sidewall controllers.

Flow Reversals in Thermally Driven Turbulence - NASA/ADS

WebJul 7, 2024 · We present an overview of the most relevant, and sometimes contrasting, theoretical approaches to Rayleigh–Taylor and mean-gradient-forced Rayleigh–Bénard two-dimensional turbulence together with numerical and experimental evidences for their support. The main aim of this overview is to emphasize that, despite the different … WebApr 1, 1993 · @article{osti_6553407, title = {Thermally driven winds}, author = {Whiteman, C D}, abstractNote = {This presentation will summarize the present state of knowledge on slope and valley wind systems, emphasizing physical concepts and recent gains in understanding from observational programs in various parts of the world. The … signs of moisture in basement

Flow Reversals in Thermally Driven Turbulence

WebAs 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 … WebApr 1, 2016 · Abstract Direct numerical simulation and laboratory experiments are used to investigate turbulent convection beneath a horizontal ice–water interface. Scaling laws are derived that quantify the dependence of the melt rate of the ice on the far-field temperature of the water under purely thermally driven conditions. The scaling laws, the simulations, … WebJul 16, 2010 · These 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 … signs of mold in crawl space

Flow Reversals in Thermally Driven Turbulence

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. signs of molestation in toddler boysWebWe describe the spectral theory including energy flux and show that the thermally-driven turbulence is similar to hydrodynamic turbulence. We also describe large-scale … therapie basteln

"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 ... " - Flow reversals in thermally driven turbulence

Flow reversals in thermally driven turbulence

WebFeb 27, 2024 · where K Ko is the Kolmogorov's constant, and Π is the energy flux or energy cascade rate, which is assumed to be constant in the inertial range. In Kolmogorov's … WebSpontaneous and stochastic reversal of large scale flow structure is an intriguing and crucial phenomenon in turbulent Rayleigh-Bénard type natural convection. This paper …

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WebSep 30, 2011 · These 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 layers up to the time that they take over the main, large scale diagonal flow, thus leading to reversal. 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 …

WebSep 30, 2011 · We analyze the reversals of the large scale flow in Rayleigh-Bénard convection both through particle image velocimetry flow visualization and direct … WebWe analyze the reversals of the large-scale flow in Rayleigh-Bénard convection both through particle image velocimetry flow visualization and direct numerical simulations of the underlying Boussinesq equations in a (quasi-) two-dimensional, rectangular geometry of aspect ratio 1. For medium Prandtl number there is a diagonal large-scale convection roll …

WebM. K. Verma, S. C. Ambhire, and A. Pandey, Flow reversals in turbulent convection with free-slip walls, Phys. Fluids, 27, 047102 (2015). PDF A. Kumar and M. K. Verma, Shell model for buoyancy-driven turbulence, Phys. Rev. E 91, 043014 (2015). PDF WebApr 24, 2024 · Turbulent Rayleigh-Bénard convection in a square cavity with rough horizontal walls is investigated at a fixed Prandtl number Pr = 0.7 over the Rayleigh number range of 10 6 ≤ Ra ≤ 10 9.We have proposed five models with rough elements of the same height but different spatial distributions to evaluate their influences on the heat transport …

WebDuring a ``complete reversal'', the above phase changes by around $180^0$ leading to reversals of the vertical velocity at all the probes. On the contrary, the vertical velocity …

WebJun 1, 2024 · We describe the spectral theory including energy flux and show that the thermally-driven turbulence is similar to hydrodynamic turbulence. We also describe large-scale quantities like... therapie avwsWebRole of flow reversals in transition to turbulence and relaminarization of pulsatile flows - Volume 917 ... A piston driven by a programmable DC servo motor was used to set-up a … signs of mold in atticWebPDF - 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 … therapie autismus grazWebJul 16, 2010 · Search worldwide, life-sciences literature Search. Advanced Search Coronavirus articles and preprints Search examples: "breast cancer" Smith J signs of mold infestationWebWe analyze the reversals of the large-scale flow in Rayleigh-Bénard convection both through particle image velocimetry flow visualization and direct numerical simulations of … signs of mole crickets in lawnWebFeb 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 signs of molestation in womenWebCentrifugal-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... signs of mites on chickens