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- W2809673435 abstract "The influence of tilt on flow reversals in two-dimensional thermal convection in rectangular cells with two typical aspect ratios, $unicode[STIX]{x1D6E4}=text{width/height}=1$ and 2, are investigated by means of direct numerical simulations. For $unicode[STIX]{x1D6E4}=1$ , tilt tends to suppress flow reversals. However, it is found that flow reversals characterized by two main rolls are promoted by tilt for $unicode[STIX]{x1D6E4}=2$ , which are even observed for some cases of small Prandtl numbers ( $Pr$ ) and large tilt angles ( $unicode[STIX]{x1D6FD}$ ). Different from level cases where the four corner rolls all have opportunities to grow and trigger a flow reversal, the reversals in an anticlockwise tilted cell with $unicode[STIX]{x1D6E4}=2$ are always led by the growth of the bottom-right or the top-left corner roll. Tilt is favourable for the growth of the bottom-right or the top-left corner roll and thus for breaking the balance between the two main rolls and triggering a flow reversal. The mode decomposition analysis shows that the appearance of the intermediate single-roll mode is crucial for reversals, and flow reversals in a tilted cell with $unicode[STIX]{x1D6E4}=2$ can be viewed as a mode competition process between single-roll mode and horizontally adjacent double-roll mode. They can only occur in a limited range of $unicode[STIX]{x1D6FD}$ where the two modes have comparable strength. Furthermore, the Nusselt numbers at the hot plate $Nu_{h}$ and at the cold plate $Nu_{c}$ behave differently during a flow reversal for $unicode[STIX]{x1D6E4}=2$ due to the preference of single corner roll growth." @default.
- W2809673435 created "2018-06-29" @default.
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- W2809673435 date "2018-06-18" @default.
- W2809673435 modified "2023-10-02" @default.
- W2809673435 title "Flow reversals in two-dimensional thermal convection in tilted cells" @default.
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- W2809673435 doi "https://doi.org/10.1017/jfm.2018.451" @default.
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