Results 11 to 20 of about 9,868,888 (379)
Prandtl and Rayleigh number dependence of heat transport in high Rayleigh number thermal convection [PDF]
Journal of Fluid Mechanics, 2011 Results from direct numerical simulation for three-dimensional Rayleigh–Bénard convection in samples of aspect ratio $\Gamma = 0. 23$ and $\Gamma = 1/ 2$ up to Rayleigh number $\mathit{Ra}= 2\ensuremath{\times} 1{0}^{12} $ are presented.
Richard J.A.M. Stevens +2 more
semanticscholar +8 more sources
Reversals in infinite-Prandtl-number Rayleigh-B\'enard convection [PDF]
Physical Review E, 2018 Using direct numerical simulations, we study the statistical properties of reversals in two-dimensional Rayleigh-B\'enard convection for infinite Prandtl number. We find that the large-scale circulation reverses irregularly, with the waiting time between
Barma, Mustansir +2 more
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Magneto-bio-thermal Convection in Rotating Nanoliquid containing Gyrotactic Microorganism [PDF]
Journal of Applied and Computational Mechanics, 2021 The magneto-convection influenced by a gyrotactic behavior of algal suspensions along with rotation in the nanoliquid layer is investigated. Linear theory based on normal mode analysis is used to find out the inquisitive results of the problem for rigid ...
Meenakshi Khurana +3 more
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High Rayleigh number variational multiscale large eddy simulations of Rayleigh-Bénard convection [PDF]
Mechanics Research Communications, 2021 The variational multiscale (VMS) formulation is used to develop residual-based VMS large eddy simulation (LES) models for Rayleigh-B nard convection. The resulting model is a mixed model that incorporates the VMS model and an eddy viscosity model. The Wall-Adapting Local Eddy-viscosity (WALE) model is used as the eddy viscosity model in this work. The
Sondak, David +4 more
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Mathematics, 2023 One of the practical methods for examining the stability and dynamical behaviour of non-linear systems is weakly non-linear stability analysis. Time-varying gravitational acceleration and triple-diffusive convection play a significant role in the ...
Pervinder Singh +4 more
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Inclined Rayleigh–Benard Convection: Role of Critical Aspect Ratio in Vertical Cavities
Engineering Proceedings, 2023 Inclined Rayleigh–Benard Convection (RBC) is numerically investigated in a two-dimensional vertical cavity; the critical aspect ratio and the critical Rayleigh number are discussed.
Wajeeha Siddiqui
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Critical Rayleigh number in Rayleigh-Bénard convection [PDF]
Quarterly of Applied Mathematics, 2009 Summary: The Rayleigh-Bénard convection is a classical problem in fluid dynamics. In the presence of rigid boundary condition, we identify the critical Rayleigh number \( R_{a}^{\ast }\) by a reduced variational problem. We prove nonlinear asymptotic stability for motionless steady states for \( R_{a}R_{a}^{\ast }.\) The dynamic of such instability is ...
Guo, Yan, Han, Yongqian
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Large-eddy simulation of Rayleigh–Bénard convection at extreme Rayleigh numbers
Physics of Fluids, 2022 We adopt the stretched spiral vortex sub-grid model for large-eddy simulation (LES) of turbulent convection at extreme Rayleigh numbers. We simulate Rayleigh–Bénard convection (RBC) for Rayleigh numbers ranging from 106 to 1015 and for Prandtl numbers 0.768 and 1. We choose a box of dimensions 1:1:10 to reduce computational cost. Our LES yields Nusselt
Roshan Samuel +2 more
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Prandtl and Rayleigh numbers dependences in Rayleigh-Bénard convection [PDF]
Europhysics Letters (EPL), 2002 Using low-temperature gaseous helium close to the critical point, we investigate the Prandtl-number dependence of the effective heat conductivity (Nusselt number) for a 1/2 aspect ratio Rayleigh-Benard cell. Very weak dependence is observed in the range 0.7 < Pr < 21; 2 × 108 < Ra < 2 × 1010: the absolute value of the average logarithmic slope δ = (∂ln
Roche, Philippe-Emmanuel +3 more
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