DNS of Instantaneous Behavior in Turbulent Forced and Mixed Convection of Liquid Metal Past a Backward-Facing Step
文献类型：期刊论文
| 作者 | Wang, Chaozheng2; Zhao, Pinghui1; Lei, Mingzhun1 ; Lu, Kun1; Ge, Zhihao2; Liu, Jiaming2; Li, Yuanjie2; Pei, Gang3
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| 刊名 | FLOW TURBULENCE AND COMBUSTION
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| 出版日期 | 2020-09-01 |
| 关键词 | DNS Liquid metal Backward-facing step Instantaneous behavior Buoyancy |
| ISSN号 | 1386-6184 |
| DOI | 10.1007/s10494-020-00214-1 |
| 通讯作者 | Zhao, Pinghui(phzhao@mail.ustc.edu.cn) |
| 英文摘要 | A direct numerical simulation has been performed to study instantaneous behavior in leadbismuth eutectic flows past a vertical, backward-facing step. A turbulent forced convection case and two cases of mixed convection, the first buoyancy-aided flow at a Richardson number Ri of 0.1 and the second buoyancy-opposed flow at Ri = 0.02, are simulated and discussed. The Reynolds number based on the bulk velocity and step height is 4805. A uniform heat flux is imposed on the expansion wall behind the step. In the forced convection case, the numerical results reveal two characteristic unsteady flow phenomena. The first is vortex-shedding motion along the separating shear layer, while the second is wall-normal flapping of the shear layer. These unsteady motions have significant influences on the thermal field. The vortex-shedding motion induces some streak-like low-temperature structures on the heated wall, while the flapping motion induces oscillation of the maximum temperature on the wall. In the mixed convection cases, buoyancy alters the flow field substantially. The two unsteady flow phenomena noted above constitute motions inherent to backwardfacing step flow. Buoyancy plays a material role in vortex development, affecting vortex ranges and time-scales. While the vortex shedding frequency is insensitive to buoyancy, the frequency of the flapping motion increases with the buoyancy. These results contribute to an improved understanding of separating and reattaching flows, especially in association with buoyancy and temperature fluctuations. The data serve to aid future development and validation of improved heat-flux modeling of low-Prandtl-number fluids. |
| WOS关键词 | DIRECT NUMERICAL-SIMULATION ; LARGE-EDDY SIMULATION ; HEAT-TRANSFER ; FLOW |
| 资助项目 | National Key R&D Program of China[2018YFB1900602] ; Collaborative Innovation Program of Hefei Science Center, CAS[2019HSC-CIP006] |
| WOS研究方向 | Thermodynamics ; Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:000565144200001 |
| 出版者 | SPRINGER |
| 资助机构 | National Key R&D Program of China ; Collaborative Innovation Program of Hefei Science Center, CAS |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/70342]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Zhao, Pinghui |
| 作者单位 | 1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Sch Phys Sci, Hefei 230026, Peoples R China 3.Univ Sci & Technol China, Sch Engn Sci, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Chaozheng,Zhao, Pinghui,Lei, Mingzhun,et al. DNS of Instantaneous Behavior in Turbulent Forced and Mixed Convection of Liquid Metal Past a Backward-Facing Step[J]. FLOW TURBULENCE AND COMBUSTION,2020. |
| APA | Wang, Chaozheng.,Zhao, Pinghui.,Lei, Mingzhun.,Lu, Kun.,Ge, Zhihao.,...&Pei, Gang.(2020).DNS of Instantaneous Behavior in Turbulent Forced and Mixed Convection of Liquid Metal Past a Backward-Facing Step.FLOW TURBULENCE AND COMBUSTION. |
| MLA | Wang, Chaozheng,et al."DNS of Instantaneous Behavior in Turbulent Forced and Mixed Convection of Liquid Metal Past a Backward-Facing Step".FLOW TURBULENCE AND COMBUSTION (2020). |
入库方式： OAI收割
来源：合肥物质科学研究院
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