On the oscillatory modes of compressible thermal convection in inclined differentially heated cavities
Lappa, Marcello and Gradinscak, Tomislav (2018) On the oscillatory modes of compressible thermal convection in inclined differentially heated cavities. International Journal of Heat and Mass Transfer, 121. pp. 412-436. ISSN 0017-9310
Preview |
Text (Lappa-Gradinscak-IJHMT-2017-oscillatory-modes-of-compressible-thermal-convection-in-inclined-differentially-heated-cavities)
Lappa_Gradinscak_IJHMT_2017_oscillatory_modes_of_compressible_thermal_convection_in_inclined_differentially_heated_cavities.pdf Accepted Author Manuscript License: 
Download (8MB)| Preview |
Abstract
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.
ORCID iDs
Lappa, Marcello
ORCID: https://orcid.org/0000-0002-0835-3420 and Gradinscak, Tomislav;
Item type: Article ID code: 62656 Dates: DateEvent30 June 2018Published10 January 2018Published Online19 December 2017AcceptedKeywords: differentially heated cavity, buoyancy flow, numerical method , compressibility, variable viscosity, Mechanical engineering and machinery, Aerospace Engineering, Fluid Flow and Transfer Processes Subjects: Technology > Mechanical engineering and machinery Department: Faculty of Engineering > Mechanical and Aerospace Engineering Depositing user: Pure Administrator Date deposited: 19 Dec 2017 13:37 Last modified: 25 Mar 2021 02:05 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/62656
CORE (COnnecting REpositories)
CORE (COnnecting REpositories)