| Title | Controlling flow reversal in two-dimensional Rayleigh-Benard convection |
| Authors | Zhang, Shengqi Xia, Zhenhua Zhou, Quan Chen, Shiyi |
| Affiliation | Peking Univ, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China Zhejiang Univ, Dept Engn Mech, Hangzhou 310027, Peoples R China Shanghai Univ, Sch Mech & Engn Sci, Shanghai Inst Appl Math & Mech, Shanghai Key Lab Mech Energy Engn, Shanghai 200072, Peoples R China Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China |
| Keywords | THERMAL-CONVECTION HEAT-TRANSFER |
| Issue Date | 25-May-2020 |
| Publisher | JOURNAL OF FLUID MECHANICS |
| Abstract | In this paper, we report that reversals of large-scale circulation in two-dimensional Rayleigh-Benard convection could be suppressed or enhanced by imposing local constant-temperature control on sidewalls. When the control area is away from the centre of the sidewalls, the control can successfully eliminate the flow reversal if the size of the control region is large enough. With a proper location, the width can be as small as 1 % of the system size. When the control region is located around the centre, the control may enhance the flow reversal. It may also stimulate the occurrence of a double-roll mode when the control is located in the centre. Explanations are also discussed based on the twofold effects of the control region on the nearby plumes and the concept of symmetry. The present work provides a new way to control the flow reversals in Rayleigh-Benard convection through modifying sidewall boundary conditions. |
| URI | http://hdl.handle.net/20.500.11897/587772 |
| ISSN | 0022-1120 |
| DOI | 10.1017/jfm.2020.210 |
| Indexed | SCI(E) Scopus EI |
| Appears in Collections: | 其他实验室 湍流与复杂系统国家重点实验室 |
