Results 21 to 30 of about 25,406 (266)

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-Bénard 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.
Sondak, David, Smith, Thomas M., Pawlowski, Roger P., Conde, Sidafa, Shadid, John N.   +4 more
openaire   +2 more sources

Marginal Stability of Oscillatory Bénard-Marangoni Convection With Internal Heat Generation

Journal of Computing Research and Innovation, 2023
The onset of oscillatory Benard-Marangoni convection in a horizontal fluid layer with internal heat generation and a deformable free surface is studied using an analytical technique employing the classical linear stability theory.
Mohamad Najib Mohamad Fadzil, Izleen Ibrahim   +1 more
doaj   +1 more source

Large Scale Structures in Rayleigh-Bénard Convection at High Rayleigh Numbers

Physical Review Letters, 2003
Direct numerical simulations of Rayleigh-Bénard convection in a plane layer with periodic boundary conditions at Rayleigh numbers up to 10(7) show that flow structures can be objectively classified as large or small scale structures because of a gap in spatial spectra. The typical size of the large scale structures does not always vary monotonically as
Hartlep, T., Tilgner, Andreas, Busse, Fritz H.   +2 more
openaire   +3 more sources

Electro-Hydrodynamic Convection in a Rotating Dielectric Micropolar Fluid Layer

International Journal of Applied Mechanics and Engineering, 2019
Thermal convection of a rotating dielectric micropolar fluid layer under the action of an electric field and temperature gradient has been investigated. The dispersion relation has been derived using normal mode analysis.
H. Kaur, G.N Verma
doaj   +1 more source

Variable Gravity Effects on Thermal Instability of Nanofluid in Anisotropic Porous Medium

International Journal of Applied Mechanics and Engineering, 2013
In this paper, we study the effects of variable gravity on thermal instability in a horizontal layer of a nanofluid in an anisotropic porous medium. Darcy model been used for the porous medium.
R. Chand, G.C. Rana, S. Kumar
doaj   +1 more source

Penetrative convection at high Rayleigh numbers

Physical Review Fluids, 2018
We study penetrative convection of a fluid confined between two horizontal plates, the temperatures of which are such that a temperature of maximum density lies between them. The range of Rayleigh numbers studied is $Ra = \left[10^6, 10^8 \right]$ and the Prandtl numbers are $Pr = 1$ and $11.6$.
Toppaladoddi, S, Wettlaufer, J
openaire   +2 more sources

Plume structure in high-Rayleigh-number convection [PDF]

Journal of Fluid Mechanics, 2005
Near-wall structures in turbulent natural convection at Rayleigh numbers of $10^{10}$ to $10^{11}$ at A Schmidt number of 602 are visualized by a new method of driving the convection across a fine membrane using concentration differences of sodium chloride. The visualizations show the near-wall flow to consist of sheet plumes.
Puthenveettil, Baburaj A, Arakeri, Jaywant H   +1 more
openaire   +5 more sources

Numerical investigation of steady state, laminar, natural convection of Bingham fluids in a trapezoidal enclosure heated from the bottom and cooled from the sides

International Journal of Thermofluids, 2023
Laminar, steady-state, natural convection of Bingham fluids in trapezoidal enclosures with a heated bottom wall, cooled inclined sidewalls and an adiabatic top wall has been studied based on numerical simulations for a range of values of nominal Bingham ...
S. Malkeson, S. Alshaaili, N. Chakraborty   +2 more
doaj   +1 more source

A study of Free Convection in A solar Chimney Model [PDF]

Engineering and Technology Journal, 2011
A solar chimney is a hot air channel attached to a circular translucent roof opens at the periphery. The roof and the ground below it form an air collector. It enhances natural ventilation by employing air temperature difference between channal inlet and
Sabah Tarik Ahmed, Miqdam Tariq Chaichan
doaj   +1 more source

Double-Diffusive Effects on the Onset of Rayleigh-Benard Convection of Water-Based Nanofluids

Applied Sciences, 2022
A numerical study on the Rayleigh–Benard convection in a shallow cavity filled with different metal-oxide water-based nanofluids is presented through a two-phase model, which accounts for the effects of the Brownian diffusion and thermophoresis, at ...
Massimo Corcione, Alessandro Quintino
doaj   +1 more source