000013874 001__ 13874
000013874 005__ 20161115094004.0
000013874 04107 $$aeng
000013874 046__ $$k2016-08-21
000013874 100__ $$aWan, Zhenhua
000013874 24500 $$aOn non-Oberbeck-Boussinesq effects in cessation-led reversals in Rayleigh-Bénard convection

000013874 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000013874 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000013874 506__ $$arestricted
000013874 520__ $$2eng$$aThe non-Oberbeck-Boussinesq (NOB) effects on flow reversals in two-dimensional (2D) Rayleigh-Bénard convection (RBC) are studied by direct numerical simulation. The Prandtl number is fixed to 0.71. The flow reversals are triggered by NOB effects when Rayleigh number (Ra) is approximately in the range of 105 S Ra S 1.5 X 107. Once the NOB effects are included, the flow pattern of only one dominant roll, becomes unstable and turns into its symmetric counterpart while the flow circulates clockwise and counter-clockwise in tum, i.e. reversal. The parameter range where flow reversals occur is considerably affected by temperature differential a. It is found the flow reversals are led by the growth in size of the single cold comer roll, and two kinds of physical mechanisms are identified to be responsible for the comer roll's growth: baroclinicity and asymmetry of buoyancy force.

000013874 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013874 653__ $$a

000013874 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000013874 720__ $$aWan, Zhenhua
000013874 8560_ $$ffischerc@itam.cas.cz
000013874 8564_ $$s163087$$uhttps://invenio.itam.cas.cz/record/13874/files/PO.FM05-1.10.23.pdf$$yOriginal version of the author's contribution as presented on CD, XMLout( page 763, code PO.FM05-1.10.23).
000013874 962__ $$r13812
000013874 980__ $$aPAPER