Abstract
The present study investigates the spectral analysis for natural convection in a tilted rectangular cavity, lled with high Prandtl oil ”Pr =880” by the code CFD. A constant vertical temperature gradient has been performed by subjecting the horizontal walls to constant temperatures Th and Tc; respectively. Other walls are adiabatic except the left small sidewall is differentially heating with temperature TA creating the horizontal temperature gradient. The results are presented for different values of lateral heating and inclination angle. The spectral analysis is used to identify and show effects on the original oscillation of the natural convection by the various investigated parameters (TA and θ).
Highlights
In the engineering field, closed enclosures heated from below (Rayleigh-Bnard convection) and differentially heated are a particular interest
A considerable numerical work has been carried out considering more complex thermal and geometric boundary conditions, due to the many technological applications, and because they constitute an ideal case for developing digital models to solve the equations of Navier-Stokes
The spectral analysis is a mean to clarify the original amplitude of any system
Summary
In the engineering field, closed enclosures heated from below (Rayleigh-Bnard convection) and differentially heated are a particular interest. A considerable numerical work has been carried out considering more complex thermal and geometric boundary conditions, due to the many technological applications, and because they constitute an ideal case for developing digital models to solve the equations of Navier-Stokes. The spectral analysis is a mean to clarify the original amplitude of any system. It is presented the stability of the natural convection by a magnitude as a function to the frequency in different characteristic points (Mergui and Penot, 1996), (Douamna et al, 1999) and (Laouar et al, 2007). A finite volume analysis is performed by the Ansys / Fluent 17.0 code for a two-dimensional enclosure in an unstable state
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