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浙江大学学报(理学版)  2022, Vol. 49 Issue (5): 564-569    DOI: 10.3785/j.issn.1008-9497.2022.05.007
数学与计算机科学     
多尺度有限元法结合分层网格模拟二维奇异摄动的两端边界层问题
孙美玲1,2(),江山2()
1.南通职业大学 数学教研室,江苏 南通 226007
2.南通大学 理学院,江苏 南通 226019
Simulation of multiscale finite element method on graded meshes for two-dimensional singularly perturbed twin boundary layers problems
Meiling SUN1,2(),Shan JIANG2()
1.Department of Mathematics,Nantong Vocational University,Nantong 226007,Jiangsu Province,China
2.School of Science,Nantong University,Nantong 226019,Jiangsu Province,China
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摘要:

通过摄动系数建立分层网格,用多尺度有限元法捕捉对流扩散方程的两端边界层,研究二维奇异摄动模型。基于分层网格并利用多尺度基函数刻画了边界层的微观信息,用有限的计算资源、较短的计算时间, 得到了不依赖于摄动系数、一致稳定的模拟结果。

关键词: 奇异摄动自适应网格两端边界层多尺度有限元一致稳定    
Abstract:

To solve a two-dimensional singularly perturbed model, a multiscale finite element method on graded meshes built from the perturbed parameter is presented for capturing the twin boundary layers of convection-diffusion equations effectively. Based on the graded meshes, the multiscale basis functions are capable of subtly describing the microscopic information in the boundary layers. No wonder, it just costs a handful of computing resource and short time to achieve the accurate and efficient results, and the results are independent of the perturbed parameter with uniform stability.

Key words: singular perturbation    adaptive meshes    twin boundary layers    multiscale finite element    uniform stability
收稿日期: 2021-08-24 出版日期: 2022-09-14
CLC:  O 241.82  
基金资助: 南通市基础科学研究指令性项目(JC2021123);国家自然科学基金面上项目(11771224);江苏省高校青蓝工程优秀骨干教师资助项目
通讯作者: 江山     E-mail: sunmeiling81@163.com;jiangshan@ntu.edu.cn
作者简介: 孙美玲(1981—),ORCID: https://orcid.org/0000-0003-0061-5155,女,博士,副教授,主要从事偏微分方程数值解及其应用研究,E-mail:sunmeiling81@163.com.
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引用本文:

孙美玲,江山. 多尺度有限元法结合分层网格模拟二维奇异摄动的两端边界层问题[J]. 浙江大学学报(理学版), 2022, 49(5): 564-569.

Meiling SUN,Shan JIANG. Simulation of multiscale finite element method on graded meshes for two-dimensional singularly perturbed twin boundary layers problems. Journal of Zhejiang University (Science Edition), 2022, 49(5): 564-569.

链接本文:

https://www.zjujournals.com/sci/CN/10.3785/j.issn.1008-9497.2022.05.007        https://www.zjujournals.com/sci/CN/Y2022/V49/I5/564

图1  区域Ω的子分块
图2  当ε=10-1和 10-5时的真解
图3  当ε=10-5时传统有限元法与多尺度有限元法的解
hε=10-5ε=10-6ε=10-7
NFEM误差NFEM误差NFEM误差
2+01364.510×10-31604.664×10-31924.748×10-3
2-12401.310×10-32881.362×10-33281.402×10-3
2-24483.870×10-45364.054×10-46164.189×10-4
2-38881.083×10-41 0481.142×10-41 2001.186×10-4
表1  不同ε下传统有限元法在分层网格上的误差能量范数
hε=10-5ε=10-6ε=10-7
NMsFEM误差NMsFEM误差NMsFEM误差
2+0348.866×10-2409.084×10-2489.083×10-2
2-1602.270×10-2722.303×10-2822.329×10-2
2-21124.686×10-31344.938×10-31544.955×10-3
2-32229.228×10-42629.565×10-43009.627×10-4
表2  不同ε下多尺度有限元法在分层网格上的误差能量范数
图4  当ε=10-5时传统有限元法于NFEM=136和多尺度有限元法于NMsFEM=112的误差
图5  当ε=10-5时传统有限元法于NFEM=240和多尺度有限元法于NMsFEM=222的误差
NFEM2FEM(G)CPU时间/sNMsFEM2MsFEM(G)CPU时间/s
13624.13423.3
24024960212
4482659112284
888210 27722221 106
表3  当ε=10-5时传统有限元法与多尺度有限元法的CPU时间
图6  ε=10-6和10-7时2种方法的剖分数N与CPU时间的log-log图示
1 苏煜城, 吴启光. 奇异摄动问题数值方法引论[M]. 重庆: 重庆出版社, 1991.
SU Y C, WU Q G. An Introduction to Numerical Methods for the Singular Perturbation Problems[M]. Chongqing: Chongqing Publishing House, 1991.
2 MILLER J J H, O’RIORDAN E, SHISHKIN G I. Fitted Numerical Methods for Singular Perturbation Problems (Revised Edition)[M]. Singapore: World Scientific, 2012. doi:10.1142/8410
doi: 10.1142/8410
3 KADALBAJOO M K, GUPTA V. A parameter uniform B-spline collocation method for solving singularly perturbed turning point problem having twin boundary layers[J]. International Journal of Computer Mathematics, 2010, 87(14): 3218-3235. doi:10.1080/00207160902980492
doi: 10.1080/00207160902980492
4 GENG F Z, QIAN S P. Reproducing kernel method for singularly perturbed turning point problems having twin boundary layers[J]. Applied Mathematics Letters, 2013, 26(10): 998-1004. DOI:10.1016/j.aml.2013.05.006
doi: 10.1016/j.aml.2013.05.006
5 杨宇博, 祝鹏, 尹云辉. 分层网格上奇异摄动问题的一致NIPG分析[J]. 计算数学, 2014, 36(4): 437-448. doi:10.12286/jssx.2014.4.437
YANG Y B, ZHU P, YIN Y H. Uniform analysis of the NIPG method on graded meshes for singularly perturbed convection-diffusion problems[J]. Mathematica Numerica Sinica, 2014, 36(4): 437-448. doi:10.12286/jssx.2014.4.437
doi: 10.12286/jssx.2014.4.437
6 ZHENG Q, LI X Z, GAO Y. Uniformly convergent hybrid schemes for solutions and derivatives in quasilinear singularly perturbed BVPs[J]. Applied Numerical Mathematics, 2015, 91: 46-59. DOI:10. 1016/j.apnum.2014.12.010
doi: 10. 1016/j.apnum.2014.12.010
7 江山, 孙美玲. 多尺度有限元结合Bakhvalov-Shishkin网格法高效处理边界层问题[J]. 浙江大学学报(理学版), 2015, 42(2): 142-146. DOI:10. 3785/j.issn.1008-9497.2015.02.004
JIANG S, SUN M L. Combining the multiscale finite element and Bakhvalov-Shishkin grid to solve the boundary layer problems[J]. Journal of Zhejiang University (Science Edition), 2015, 42(2): 142-146. DOI:10.3785/j.issn.1008-9497.2015.02.004
doi: 10.3785/j.issn.1008-9497.2015.02.004
8 郑权, 刘颖, 刘忠礼. 奇异摄动问题在修正的Bakhvalov-Shishkin网格上的混合差分格式[J]. 浙江大学学报(理学版), 2020, 47(4): 460-468. DOI:10. 3785/j.issn.1008-9497.2020.04.009
ZHENG Q, LIU Y, LIU Z L. The hybrid finite difference schemes on the modified Bakhvalov-Shishkin mesh for the singularly perturbed problem[J]. Journal of Zhejiang University (Science Edition), 2020, 47(4): 460-468. DOI:10.3785/j.issn.1008-9497.2020. 04.009
doi: 10.3785/j.issn.1008-9497.2020. 04.009
9 CHENG Y. On the local discontinuous Galerkin method for singularly perturbed problem with two parameters[J]. Journal of Computational and Applied Mathematics, 2021, 392: 113485. DOI:10. 1016/j.cam.2021.113485
doi: 10. 1016/j.cam.2021.113485
10 FRANZ S, LINß T, ROOS H G, et al. Uniform superconvergence of a finite element method with edge stabilization for convection-diffusion problems[J]. Journal of Computational Mathematics, 2010, 28(1): 32-44. DOI:10.4208/jcm.2009.09-m1005
doi: 10.4208/jcm.2009.09-m1005
11 BRDAR M, ZARIN H, TEOFANOV L. A singularly perturbed problem with two parameters in two dimensions on graded meshes[J]. Computers and Mathematics with Applications, 2016, 72(10): 2582-2603. DOI:10.1016/j.camwa.2016.09.021
doi: 10.1016/j.camwa.2016.09.021
12 JIANG S, PRESHO M, HUANG Y Q. An adapted Petrov-Galerkin multi-scale finite element method for singularly perturbed reaction-diffusion problems[J]. International Journal of Computer Mathematics, 2016, 93(7): 1200-1211. DOI:10.1080/00207160. 2015.1041935
doi: 10.1080/00207160. 2015.1041935
13 LI Z W, WU B, XU Y S. High order Galerkin methods with graded meshes for two-dimensional reaction-diffusion problems[J]. International Journal of Numerical Analysis and Modeling, 2016, 13(3): 319-343.
14 XU S P, DENG W B, WU H J. A combined finite element method for elliptic problems posted in domains with rough boundaries[J]. Journal of Computational and Applied Mathematics, 2018, 336: 235-248. DOI:10.1016/j.cam.2017.12.049
doi: 10.1016/j.cam.2017.12.049
[1] 郑权, 刘颖, 刘忠礼. 奇异摄动问题在修正的Bakhvalov-Shishkin网格上的混合差分格式[J]. 浙江大学学报(理学版), 2020, 47(4): 460-468.
[2] 梁克维,金中秋,李大明. 关于X一致的奇异摄动问题的差分格式及其收敛速度[J]. 浙江大学学报(理学版), 2000, 27(5): 473-476.