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The variational iteration method, based on the variational principle, is a numerical format with high numerical accuracy and convenience, has been widely applied in the numerical solution of various strong-nonlinear solitary wave equations. In this paper, the modified variational iteration method is used to improve the original numerical method, that is, the parameter h is introduced before the variational item. By defining the discrete two norm of the error function and drawing the h-curve in the domain of definition, the h that minimizes the error is determined and then returned to the original iteration process for solution. In this paper, We choose the uniform grid points to caculate the error. At the same time, the introduction of parameters also expands the convergence domain of the original numerical solution and achieves the numerical optimization under the condition of a certain number of iterations, which shows better than the general method. In the numerical experiment, the above results are applied to the fourth-order Cahn-Hilliard equation and the Benjamin-Bona-Mahony-Burgers equation. The Cahn-Hilliard equation was first found to describe the phenomeno in interface dynamics. It has vital application in physical. For the fourth-order Cahn-Hilliard equation, the error order of the ordinary variational iteration method is about
$10^{-1}$ , and the absolute error is reduced to$10^{-4}$ after the modification. Moreover, the modified method expands the convergence domain of the original numerical solution. And the Benjamin-Bona-Mahony-Burgers equation can be degenerated to the Benjamin-Bona-Mahony and the Burgers equation under the appropriate parameter selection. For the Benjamin-Bona-Mahony-Burgers equation, if using the normal method, we can find that the numerical solution will not converge. But the accuracy of the numerical solution is decreased to$10^{-3}$ by using the variational iteration method with auxiliary parameters, which is superior to the original variational iteration method in the approximation effect of the true solution. This numerical method also provides a scheme and reference for the numerical solution of other strong-nonlinear solitary wave differential equations. This scheme provieds a continuous solution in the time and space domain, which differs from the finite difference method, finite volume scheme and so on. That means we can use this method independently without using any other scheme to match our approarch, this is also the advantage of the modified variational iteration method.-
Keywords:
- modified variational iteration method /
- nonlinear solitary wave equation /
- fourth order Cahn-Hilliard equation /
- Benjamin-Bona-Mahony-Burgers equation
[1] Kartashov Y V, Astrakharchik G E, Malomed B A, Torner L 2019 Nat. Rev. Phys. 1 185Google Scholar
[2] Kengne E, Liu W M, Malomed B A 2020 Phys. Rep. 1 899
[3] 张大军 2020 物理学报 69 010202Google Scholar
Zhang D J 2020 Acta Phys. Sin. 69 010202Google Scholar
[4] 宋彩芹, 朱佐农 2020 物理学报 69 010204Google Scholar
Song C Q, Zhu Z N 2020 Acta Phys. Sin. 69 010204Google Scholar
[5] Wang P, Zheng Y L, Chen X F, Huang C M, Kartashov Y V, Torner L, Konotop, V V, Ye F W 2020 Nature 577 42Google Scholar
[6] Fu Q D, Wang P, Huang C M, Kartashov Y V, Torner L, Konotop V V, Ye F W 2020 Nat. Photonics 14 663Google Scholar
[7] Tian S F 2016 Proc. Math. Phys. Eng. Sci. 472 20160588Google Scholar
[8] Tian S F 2017 J. Differ. Equ. 262 506Google Scholar
[9] Ma W X 2020 Appl. Math. Lett. 102 106161Google Scholar
[10] Zhang G Q, Yan Z Y 2020 Physica D 402 132170Google Scholar
[11] Wang X B, Han B 2020 J. Math. Anal. Appl. 487 123968Google Scholar
[12] Li B Q, Ma Y L 2020 Appl. Math. Comput. 386 125469Google Scholar
[13] Su J J, Gao Y T, Ding C C 2019 Appl. Math. Lett. 88 201Google Scholar
[14] Zhang X, Wang R, Zhang Y Q, Kartashov Y V, Li F, Zhong H, Guan H, Gao K, Li F, Zhang Y P, Xiao M 2020 Nat. Commun. 11 1902Google Scholar
[15] Jin K, Li Y, Li F, Belic M R, Zhang Y P, Zhang Y Q 2020 Adv. Photonics 2 046002Google Scholar
[16] Zeng L, Zeng J 2019 Adv. Photonics. 1 046004Google Scholar
[17] Zeng L, Zeng J 2020 Commun. Phys. 3 26Google Scholar
[18] Yang J K 2008 J. Comput. Phys. 227 6862Google Scholar
[19] Bao W Z, Yin J 2019 Res. Math. Sci. 6 1Google Scholar
[20] Antoine X, Bao W Z, Besse C 2013 Comput. Phys. Commun. 184 2621Google Scholar
[21] Cockburn B, Shu C W 1998 SIAM J. Math. Anal. 35 2440Google Scholar
[22] Jiang G S, Shu C W 1996 J. Comput. Phys. 126 202Google Scholar
[23] He J H 1999 Int. J. Non. Linear Mech. 34 699Google Scholar
[24] He J H 2007 J. Comput. Appl. Math. 207 3Google Scholar
[25] He J H 2007 Comput. Math. Appl. 54 881Google Scholar
[26] Hesameddini E, Latifizadeh H 2009 J. Nonlinear Sci. Numer. Simul. 10 1377Google Scholar
[27] Salkuyeh D K 2008 Comput. Math. Appl. 56 2027Google Scholar
[28] Noor M A, Mohyud-Din S T 2008 J. Nonlinear Sci. Numer. Simul. 9 141Google Scholar
[29] Liao S J 2004 Appl. Math. Comput. 147 499Google Scholar
[30] Zayed E M, Rahman H 2009 J. Nonlinear Sci. Numer. Simul. 10 1093Google Scholar
[31] Hosseini M M, Mohyud-Din S T, Ghaneai H, Usman M 2010 J. Comput. Appl. Math. 11 495Google Scholar
[32] Cahn J W, Hilliard J E 1958 J. Chem. Phys. 28 258Google Scholar
[33] Barrett J W, Blowey J F 1997 Numer. Math. 77 1Google Scholar
[34] Wells G N, Kuhl E, Garikipati K 2006 J. Comput. Phys. 218 860Google Scholar
[35] Kay D, Welford R 2006 J. Comput. Phys. 212 288Google Scholar
[36] Benjamin T B, Bona J L, Mahony J J 1972 Philos. Trans. R. Soc. A 272 47Google Scholar
[37] Karakoc S B G, Bhowmik S K 2019 Comput. Math. Appl. 77 1917Google Scholar
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表 1 不同点处真解与数值解对比
Table 1. Comparison of true and numerical solutions at different points
$ (x, t)$ 原始数值解$ u_1$ 修正数值解$ u_2$ 精确解u (1, 0.2) –1.855 × 10–1 –1.855 × 10–1 –1.855 × 10–1 (1, 0.4) –2.176 × 10–1 –1.857 × 10–1 –1.864 × 10–1 (1, 0.6) –2.970 × 10–1 –1.860 × 10–1 –1.873 × 10–1 (1, 0.8) –4.234 × 10–1 –1.862 × 10–1 –1.881 × 10–1 (1, 1.0) –6.297 × 10–1 –1.863 × 10–1 –1.889 × 10–1 (1, 1.2) –8.914 × 10–1 –1.866 × 10–1 –1.893 × 10–1 (1, 1.4) –1.212 –1.868 × 10–1 –1.903 × 10–1 (1, 1.6) –1.590 –1.870 × 10–1 –1.910 × 10–1 (1, 1.8) –2.033 –1.872 × 10–1 –1.916 × 10–1 (1, 2.0) –2.429 –1.874 × 10–1 –1.922 × 10–1 -
[1] Kartashov Y V, Astrakharchik G E, Malomed B A, Torner L 2019 Nat. Rev. Phys. 1 185Google Scholar
[2] Kengne E, Liu W M, Malomed B A 2020 Phys. Rep. 1 899
[3] 张大军 2020 物理学报 69 010202Google Scholar
Zhang D J 2020 Acta Phys. Sin. 69 010202Google Scholar
[4] 宋彩芹, 朱佐农 2020 物理学报 69 010204Google Scholar
Song C Q, Zhu Z N 2020 Acta Phys. Sin. 69 010204Google Scholar
[5] Wang P, Zheng Y L, Chen X F, Huang C M, Kartashov Y V, Torner L, Konotop, V V, Ye F W 2020 Nature 577 42Google Scholar
[6] Fu Q D, Wang P, Huang C M, Kartashov Y V, Torner L, Konotop V V, Ye F W 2020 Nat. Photonics 14 663Google Scholar
[7] Tian S F 2016 Proc. Math. Phys. Eng. Sci. 472 20160588Google Scholar
[8] Tian S F 2017 J. Differ. Equ. 262 506Google Scholar
[9] Ma W X 2020 Appl. Math. Lett. 102 106161Google Scholar
[10] Zhang G Q, Yan Z Y 2020 Physica D 402 132170Google Scholar
[11] Wang X B, Han B 2020 J. Math. Anal. Appl. 487 123968Google Scholar
[12] Li B Q, Ma Y L 2020 Appl. Math. Comput. 386 125469Google Scholar
[13] Su J J, Gao Y T, Ding C C 2019 Appl. Math. Lett. 88 201Google Scholar
[14] Zhang X, Wang R, Zhang Y Q, Kartashov Y V, Li F, Zhong H, Guan H, Gao K, Li F, Zhang Y P, Xiao M 2020 Nat. Commun. 11 1902Google Scholar
[15] Jin K, Li Y, Li F, Belic M R, Zhang Y P, Zhang Y Q 2020 Adv. Photonics 2 046002Google Scholar
[16] Zeng L, Zeng J 2019 Adv. Photonics. 1 046004Google Scholar
[17] Zeng L, Zeng J 2020 Commun. Phys. 3 26Google Scholar
[18] Yang J K 2008 J. Comput. Phys. 227 6862Google Scholar
[19] Bao W Z, Yin J 2019 Res. Math. Sci. 6 1Google Scholar
[20] Antoine X, Bao W Z, Besse C 2013 Comput. Phys. Commun. 184 2621Google Scholar
[21] Cockburn B, Shu C W 1998 SIAM J. Math. Anal. 35 2440Google Scholar
[22] Jiang G S, Shu C W 1996 J. Comput. Phys. 126 202Google Scholar
[23] He J H 1999 Int. J. Non. Linear Mech. 34 699Google Scholar
[24] He J H 2007 J. Comput. Appl. Math. 207 3Google Scholar
[25] He J H 2007 Comput. Math. Appl. 54 881Google Scholar
[26] Hesameddini E, Latifizadeh H 2009 J. Nonlinear Sci. Numer. Simul. 10 1377Google Scholar
[27] Salkuyeh D K 2008 Comput. Math. Appl. 56 2027Google Scholar
[28] Noor M A, Mohyud-Din S T 2008 J. Nonlinear Sci. Numer. Simul. 9 141Google Scholar
[29] Liao S J 2004 Appl. Math. Comput. 147 499Google Scholar
[30] Zayed E M, Rahman H 2009 J. Nonlinear Sci. Numer. Simul. 10 1093Google Scholar
[31] Hosseini M M, Mohyud-Din S T, Ghaneai H, Usman M 2010 J. Comput. Appl. Math. 11 495Google Scholar
[32] Cahn J W, Hilliard J E 1958 J. Chem. Phys. 28 258Google Scholar
[33] Barrett J W, Blowey J F 1997 Numer. Math. 77 1Google Scholar
[34] Wells G N, Kuhl E, Garikipati K 2006 J. Comput. Phys. 218 860Google Scholar
[35] Kay D, Welford R 2006 J. Comput. Phys. 212 288Google Scholar
[36] Benjamin T B, Bona J L, Mahony J J 1972 Philos. Trans. R. Soc. A 272 47Google Scholar
[37] Karakoc S B G, Bhowmik S K 2019 Comput. Math. Appl. 77 1917Google Scholar
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