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采用间断有限元法(discontinuous finite element method, DFEM)求解非规则形状介质内的辐射导热耦合传热问题, 得到了典型非规则形状介质内辐射导热耦合传热问题的高精度数值结果. 和传统连续型有限元方法不同, DFEM将计算区域划分成相互独立的离散单元, 形函数的构造、未知量的加权近似以及控制方程的求解均在每一个离散单元上进行. 通过在单元之间施加迎风格式的数值通量, DFEM保证了整个计算区域的连续性, 因此这种方法兼具良好的几何灵活性和局部守恒性. 推导了辐射传输方程和能量扩散方程的DFEM离散格式, 验证了DFEM求解辐射导热耦合传热问题的正确性; 同时研究了不同几何形状介质内辐射导热耦合传热问题, 得到了典型非规则形状介质内辐射导热耦合传热的高精度数值结果.The discontinuous finite element method (DFEM) is used to investigate the coupled radiation-conduction heat transfer in an irregular medium, and the highly accurate solutions for several typical media are numerically obtained. Comparing with the traditional continuous finite element method, the computational domain in the DFEM application is discretized into unstructured meshes that are assumed to be separated from each other. The shape function construction, field variable approximation, and numerical solutions are obtained for every single element. The continuity of the computational domain is maintained by modeling a numerical flux with the up-winding scheme. Thus the DFEM has the salient feature of geometry flexibility and simultaneously supports locally conservative solutions. The DFEM discretization for the radiative transfer equation and the energy diffusion equation are first presented, and the accuracies of the DFEM for coupled radiation-conduction heat transfer problems are verified. Combined radiation-conduction heat transfer problems in several irregular media are afterward solved, and the highly accurate DFEM solutions are presented.
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Keywords:
- radiation-conduction /
- coupled heat transfer /
- numerical simulation /
- discontinuous finite element method
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图 9 (a)普朗克数Npl = 0.1和1.0时内含圆形热边界的非规则形状介质中线上温度分布; (b) Npl = 0.1时介质温度分布; (c) Npl = 1.0时介质温度分布
Fig. 9. (a) Temperature distributions along the centerline of the irregular medium with an inner hot boundary; (b) temperature distribution within the computation domain for the case of Npl = 0.1; (c) temperature distribution within the computation domain for the case of Npl = 1.0.
图 11 (a)普朗克数Npl = 0.1和1.0时内含两个圆形热边界的矩形介质中线上温度分布; (b) Npl = 0.1时介质温度分布; (c) Npl = 1.0时介质温度分布
Fig. 11. (a) Temperature distributions along the centerline of the square medium with two circular hot boundaries; (b) temperature distribution within the computation domain for the case of Npl = 0.1; (c) temperature distribution within the computation domain for the case of Npl = 1.0
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[1] Viskanta R 1965 J. Heat Transf. 87 143
Google Scholar
[2] Viskanta R, Incropera F P 1985 J. Sol. Energy Eng. 107 29
Google Scholar
[3] Wang P Y, Tan H P, Liu L H, Tong T W 2000 J. Thermophys. Heat Transf. 14 512
Google Scholar
[4] Zhang J Q, Nie L R, Chen C Y, Zhang X Y 2016 AIP Adv. 6 075212
Google Scholar
[5] Chen R Y, Pan W L, Zhang J Q, Nie L R 2016 Chaos 26 093113
Google Scholar
[6] Chen R Y, Tong L M, Nie L R, Wang C J, Pan W L 2017 Physica A 468 532
Google Scholar
[7] 李树, 李刚, 田东风, 邓力 2013 62 249501
Google Scholar
Li S, Li G, Tian D F, Deng L 2013 Acta Phys. Sin. 62 249501
Google Scholar
[8] Sun B, Wang H, Sun X B, Hong J, Zhang Y J 2012 Chin. Phys. B 21 129501
Google Scholar
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Google Scholar
[10] Chen R Y, Nie L R, Chen C Y 2018 Chaos 28 053115
Google Scholar
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Google Scholar
Liang Z C, Jin Y Q 2003 Acta Phys. Sin. 52 1319
Google Scholar
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Google Scholar
[13] 赵军明 2007 博士学位论文 (哈尔滨: 哈尔滨工业大学)
Zhao J M 2007 Ph. D. Dissertation (Harbin: Harbin Institute of Technology) (in Chinese)
[14] 赵军明, 刘林华 2007 化工学报 58 1110
Zhao J M, Liu L H 2007 J. Chem. Ind. Eng. 58 1110
[15] 胡帅, 高太长, 刘磊, 易红亮, 贲勋 2015 64 094201
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Hu S, Gao T C, Liu L, Yi H L, Ben X 2015 Acta Phys. Sin. 64 094201
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[17] 高效伟, 王静, 崔苗 2011 中国科学: 物理学 力学 天文学 41 302
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Gao X W, Wang J, Cui M 2011 Sci. Sin. Phys. Mech. Astron. 41 302
Google Scholar
[18] 孙杰 2016 博士学位论文 (哈尔滨: 哈尔滨工业大学)
Sun J 2016 Ph. D. Dissertation (Harbin: Harbin Institute of Technology) (in Chinese)
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[21] Tan J Y, Liu L H, Li B X 2006 Numer. Heat Transf. Part B-Fundam. 49 179
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[22] Wang C H, Qu L, Zhang Y, Yi H L 2018 J. Quant. Spectrosc. Radiat. Transf. 208 108
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[23] Liu L H, Tan J Y, Li B X 2006 J. Quant. Spectrosc. Radiat. Transf. 101 237
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Google Scholar
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Google Scholar
Zhang K J, Liu L, Zeng Q W, Gao T C, Hu S, Chen M 2019 Acta Phys. Sin. 68 194207
Google Scholar
[28] Mishra S C, Krishna C H, Kim M Y 2011 Numer. Heat Transf. Part A-Appl. 60 254
Google Scholar
[29] Mishra S C, Roy H K 2007 J. Comput. Phys. 223 89
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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