On the oscillatory modes of compressible thermal convection in inclined differentially heated cavities

Research output: Research - peer-reviewArticle

We consider the case of a tall differentially heated cavity (containing air) for which the buoyancy flow is in the so-called boundary-layer regime (displaying thin regions featured by strong temperature gradients adjacent to the vertical walls and thermally stratified fluid in the centre). By using a numerical method able to account for compressibility and variable viscosity effects, we investigate the response of such a system to the application of temperature differences in a range of characteristic numbers for which the resulting flow is expected to be time-periodic or highly time-dependent. More precisely, the problem is examined by allowing both the Rayleigh number and the inclination (teta) of this configuration with respect to the vertical direction to span relatively wide intervals (1.8x10^5<=Ra<=3x10^6, -90<=teta<=90). Insights into the influence of variable thermodynamic properties are obtained by comparing such numerical results with equivalent simulations based on the classical Boussinesq approximation. The evolution of the considered system towards a fully turbulent state is also discussed to a certain extent.
Original languageEnglish
Pages (from-to)412-436
Number of pages25
JournalInternational Journal of Heat and Mass Transfer
Early online date10 Jan 2018
StatePublished - 30 Jun 2018

    Research areas

  • differentially heated cavity, buoyancy flow, numerical method , compressibility, variable viscosity

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