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采用线性耦合Brusselator模型和Lengyel-Epstein模型, 数值研究了双层耦合非对称反应扩散系统中振荡图灵斑图的动力学, 并分析了图灵模、高阶模以及霍普夫模之间的相互作用及其对振荡图灵斑图的影响. 模拟结果表明, 在Lengyel-Epstein模型激发的超临界图灵模
$ {k_1}$ 的激励下, Brusselator模型中处于霍普夫区域的高阶模$ \sqrt 3 {k_1}$ 被激发, 这两个模式相互作用从而产生了同步振荡六边形斑图. 随着控制参数b的增加, 该振荡六边形斑图首先经历倍周期分岔进入双倍振荡周期, 经历多倍振荡周期后, 在霍普夫模式的参与下, 最终进入时空混沌态. 同步振荡六边形斑图形成的条件是Brusselator模型中的次临界图灵模$ {k_2}$ 的本征值高度低于处于霍普夫区域的高阶图灵模$ \sqrt 3 {k_1}$ 的本征值高度, 且两个图灵模之间不存在空间共振关系. 当两个图灵模满足空间共振时, 系统优先选择空间共振模式, 从而产生超点阵斑图. 霍普夫模和图灵模共同作用下只能产生非同步振荡图灵斑图. 此外, 耦合强度对振荡图灵斑图也有重要的影响.-
关键词:
- 非对称耦合反应扩散系统 /
- 振荡图灵斑图 /
- 图灵模 /
- 高阶模 /
- 霍普夫模
Pattern formation and self-organization are ubiquitous in nature and commonly observed in spatially extended non-equilibrium systems. As is well known, the origin of spatio-temporal patterns can be traced to the instability of the system, and is always accompanied by a symmetry breaking phenomenon. In reality, most of non-equilibrium systems are constructed by interactions among several different units, each of which has its unique symmetry breaking mechanism. The interaction among different units described by coupled pattern forming system gives rise to a variety of self-organized patterns including stationary and/or oscillatory patterns. In this paper, the dynamics of oscillatory Turing patterns in two-layered coupled non-symmetric reaction diffusion systems are numerically investigated by linearly coupling the Brusselator model and the Lengyel-Epstein model. The interaction among the Turing modes, higher-order harmonics and Hopf mode, and their effects on oscillatory Turing pattern are also analyzed. It is shown that the supercritical Turing mode${k_1}$ in the Lengyel-Epstein model is excited and interacts with the higher-order harmonics$\sqrt 3 {k_1}$ located in the Hopf region in the Brusselator model, and thus giving rise to the synchronous oscillatory hexagon pattern. The harmonic$\sqrt 2 {k_1}$ that can also be excited initially is some parameter domain, but it is unstable and vanishes finally. As the parameter b is increased, this oscillatory hexagon pattern first undergoes period-doubling bifurcation and transits into two-period oscillation, and then into multiple-period oscillation. When the Hopf mode participates in the interaction, the pattern will eventually transit into chaos. The synchronous oscillatory hexagon pattern can only be obtained when the subcritical Turing mode${k_2}$ in the Brusselator model is weaker than the higher-order harmonics$\sqrt 3 {k_1}$ located in the Hopf region and neither of the two Turing modes satisfies the spatial resonance condition. The system favorites the spatial resonance and selects the super-lattice patterns when these modes interact with each other. The interaction between Hopf mode and Turing mode can only give rise to non-synchronous oscillatory patterns. Moreover, the coupling strength also has an important effect on the oscillatory Turing pattern. These results not only provide a new pattern forming mechanism which can be extended to other nonlinear systems, but also gives an opportunity for more in-depth understanding the nature and their relevance to technological applications.-
Keywords:
- non-symmetric coupled reaction diffusion system /
- oscillatory Turing patterns /
- Turing mode /
- higher-order mode /
- Hopf mode
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图 1 双层线性耦合系统以及单层系统的色散关系 (a) 双层线性耦合系统; (b) 单层Brusselator模型; (c) 单层Lengyel-Epstein模型. 参数取值为:
$( a, b) = (3, 9)$ ,$(c, d) = $ $ (15, \;9)$ ,${D_{{u_1}}} = 2.2$ ,${D_{{v_1}}} = 4.0$ ,${D_{{u_2}}} =21.9$ ,${D_{{v_2}}} = $ $ 400,$ $\alpha = 0.15$ Fig. 1. Dispersion relationship of two-layered linear coupling system and single layer system: (a) Two-layered linear coupling system; (b) single layer Brusselator model; (c) single layer Lengyel-Epstein model. Parameter:
$(a, b) = (3, 9)$ ,$ \left( {c, d} \right) = \left( {15, 9} \right)$ ,${D_{{u_1}}} = 2.2$ ,${D_{{v_1}}} = 4.0$ ,${D_{{u_2}}} = 21.9$ ,${D_{{v_2}}} = $ $ 400$ ,$\alpha = 0.15$ 
图 3 参数 b对时空斑图的影响 (a) 不同参数b下的色散关系曲线; (b1)静态蜂窝状六边形斑图,
$b = 8.5$ ; (b2)单倍周期同步振荡六边形斑图,$ b =9$ ; (b3) 2倍周期非同步振荡六边形斑图,$ b =9.25$ ; (b4) 5倍周期非同步振荡六边形斑图,$ b =9.33$ ; (b5) 3倍周期非同步振荡斑图,$ b =9.5$ ; (b6)时空混沌,$ b =10$ Fig. 3. Influence of parameter bon spatio-temporal patterns: (a) Dispersion curves under different parameters b; (b1) static honeycomb hexagon pattern at
$b = 8.5$ ; (b2) single-period synchronous oscillation hexagon pattern at$b = 9$ ; (b3) non-synchronous oscillation hexagon pattern of 2 times the period at$b = 9.25$ ; (b4) non-synchronous oscillation hexagon pattern of 5 times the period at$b = 9.33$ ; (b5) non-synchronous oscillation pattern of 3 times the period at$b = 9.5$ ; (b6) spatio-temporal chaos at$b = 10$ .
图 4 非共振时不同本征值
${h_2}$ 下的时空斑图 (a) 不同本征值${h_2}$ 下的色散关系曲线; (b1) 静态蜂窝状六边形斑图,${h_2} = - 5.50$ ,${D_{{u_1}}} = 5.25$ ,${D_{{v_1}}} = 6.5$ ; (b2) 同步振荡六边形斑图,${h_2} = - 3.44$ ,${D_{u{}_1}} = 3.62$ ,${D_{{v_1}}} = 5$ ; (b3) 超六边形斑图,${h_2} = - 0.56$ ,${D_{{u_1}}} = 2.2$ ,${D_{{v_1}}} = 4.6$ ; (b4) 叠加斑图,${h_2} = - 0.21$ ,${D_{{u_1}}} = 2.1$ ,${D_{v{}_1}} = 4.8$ ; (b5)混合斑图,${h_2} = 0.26$ ,${D_{{u_1}}} = 2.03$ ,${D_{{v_1}}} = $ $ 5.3$ ; (b6) 条纹斑图,${h_2} = 0.62$ ,${D_{{u_1}}} = 1.98$ ,${D_{{v_1}}} = 5.8$ Fig. 4. Complex patterns under different eigenvalues
${h_2}$ at non-resonance: (a) Dispersion curves under different eigenvalues${h_2}$ ; (b1) static honeycomb hexagon pattern,${h_2} = - 5.50$ ,${D_{{u_1}}} = 5.25$ ,${D_{{v_1}}} = 6.5$ ; (b2) synchronous oscillation hexagon pattern,${h_2} = - 3.44$ ,${D_{{u_1}}} = 3.62$ ,${D_{{v_1}}} = 5$ ; (b3) super-hexagon pattern,${h_2} = - 0.56$ ,${D_{{u_1}}} = 2.2$ ,${D_{{v_1}}} = 4.6$ ; (b4) superposition pattern,${h_2} = - 0.21$ ,${D_{{u_1}}} = 2.1$ ,${D_{{v_1}}} = 4.8$ ; (b5) hybrid pattern,${h_2} = 0.26$ ,${D_{{u_1}}} = 2.03$ ,${D_{{v_1}}} = 5.3$ ; (b6) stripe pattern,${h_2} = 0.62$ ,${D_{{u_1}}} = 1.98$ ,${D_{{v_1}}} = 5.8$ .
图 5 共振时不同本征值
${h_2}$ 下的时空斑图 (a) 不同本征值${h_2}$ 下的色散关系曲线; (b1)静态蜂窝状六边形斑图,${h_2} = - 1.7$ ,${D_{{u_1}}} \!=\! 14.55$ ,${D_{{v_1}}} \!=\! 24$ ; (b2) 静态黑眼斑图,${h_2} \!=\! - 1.1$ ,${D_{{u_1}}} \!=\! 13.6$ ,${D_{{v_1}}} \!=\! 25$ ; (b3) 条纹斑图,${h_2} \!=\! 1.0$ ,${D_{{u_1}}} \!=\! 12$ ,${D_{{v_1}}} \!=\! 40$ Fig. 5. Spatiotemporal patterns under different eigenvalues
${h_2}$ at resonance: (a) Dispersion curves under different eigenvalues${h_2}$ ; (b1) static honeycomb hexagon pattern,${h_2} = - 1.7$ ,${D_{{u_1}}} = 14.55$ ,${D_{{v_1}}} = 24$ ; (b2) static black eye pattern,${h_2} = - 1.1$ ,${D_{{u_1}}} = 13.6$ ,${D_{{v_1}}} = 25$ ; (b3) stripe pattern,${h_2} = 1.0$ ,${D_{{u_1}}} = 12$ ,${D_{{v_1}}} = 40$ .
图 6 不同耦合强度下的时空斑图(其他参数同图1) (a) 不同耦合强度下的色散关系曲线图; (b1)静态蜂窝状六边形斑图,
$\alpha = 0.1$ ; (b2)同步振荡六边形斑图,$\alpha = 0.17$ ; (b3)非同步振荡六边形斑图,$\alpha = 0.3$ ; (b4)均匀态,$\alpha = 0.6$ Fig. 6. Spatio-temporal patterns under different coupling intensities at non-resonance: (a) Dispersion relationship curve diagram under different coupling intensities; (b1) static honeycomb hexagon pattern at
$\alpha = 0.1$ ; (b2) synchronous oscillation hexagon pattern at$\alpha = 0.17$ ; (b3) non-synchronous oscillation hexagon pattern at$\alpha = 0.3$ ; (b4) uniform state at$\alpha = 0.6$ . Other parameters are the same as those in Fig. 1.
图 7 振荡黑眼斑图(
$\left( {a, b} \right) = \left( {3, 10.5} \right)$ ,$\left( {c, d} \right) = \left( {15, 9} \right)$ ,${D_{{u_1}}} = 15$ ,${D_{{v_1}}} = 23$ ,${D_{{u_2}}} = 21.9$ ,${D_{{v_2}}} = 400$ ,$\alpha = 0.45$ ) (a) 耦合系统的色散关系曲线; (b) 振幅分布; (c) 3个位置处${u_1}$ 的时间变化关系图; (d) 斑图演化过程Fig. 7. Oscillatory black-eye pattern (
$\left( {a, b} \right) = \left( {3, 10.5} \right)$ ,$\left( {c, d} \right) = \left( {15, 9} \right)$ ,${D_{u1}} = 15$ ,${D_{v1}} = 23$ ,${D_{u2}} = 21.9$ ,${D_{v2}} = 400$ ,$\alpha = 0.45$ ): (a) Dispersion curve of coupled system; (b) amplitude distribution; (c) time variation of${u_1}$ at three positions; (d) evolution of pattern. -
[1] Marino F, Giacomelli G 2019 Phys. Rev. Lett. 122 174102
Google Scholar
[2] Bleicher P, Sciortino A, Bausch A R 2020 Sci. Rep. 10 62151
Google Scholar
[3] Fencl M 2020 Nonlinear Anal. Theory Methods Appl. 196 111815
Google Scholar
[4] Gao Y P, Zhang Y F, Schwen D, Jiang C, Gan J 2019 Sci. Rep. 9 7835
Google Scholar
[5] Dong L F, Mi Y L, Pan Y Y 2020 Phys. Plasmas 27 023504
Google Scholar
[6] Yu G L, Dong L F, Guo L T, Liu F C, Li C X, Dou Y Y, Ren C H, Pan Y Y 2020 Phys. Plasmas 27 053503
Google Scholar
[7] 郑志刚, 翟云 2020 中国科学: 物理学 力学 天文学 50 69
Google Scholar
Zheng Z G, Zhai Y 2020 Sci. China, Ser. G 50 69
Google Scholar
[8] Gao J, Gu C G 2019 IEEE Access 7 140391
Google Scholar
[9] Gu L C, Gong P L, Wang H Q 2020 Discrete Dyn. Nat. Soc. 2020 5293748
[10] Yang R, Song Y L 2016 Nonlinear Anal. Real World Appl. 31 356
Google Scholar
[11] Dolnik M, Rovinsky A B, Zhabotinsky A M, Epstein I R 1999 J. Phys. Chem. A 103 38
Google Scholar
[12] Yang L F, Zhabotinsky A M, Epstein I R 2004 Phys. Rev. Lett. 92 198303
Google Scholar
[13] Zhabotinsky A M, Dolnik M, Epstein I R 1995 J. Chem. Phys. 103 10306
Google Scholar
[14] Konishi K, Hara N 2018 Phys. Rev. E 97 052201
Google Scholar
[15] 李新政, 白占国, 李燕 2019 物理学报 68 068201
Google Scholar
Li X Z, Bai Z G, Li Y 2019 Acta Phys. Sin. 68 068201
Google Scholar
[16] Paquin-Lefebvre F, Xu B, Dipietro K L, Lindsay A E, Jilkine A 2020 J. Theor. Biol. 497 110242
Google Scholar
[17] Yang L F, Dolnik M, Zhabotinsky A M, Epstein I R 2002 Phys. Rev. Lett. 88 208303
Google Scholar
[18] Yang L F, Epstein I R 2003 Phys. Rev. Lett. 90 178303
Google Scholar
[19] Anguelov R, Stoltz S M 2017 Math. Comput. Simul. 133 39
Google Scholar
[20] Li X Z, Bai Z G, Li Y, Zhao K 2016 Mod. Phys. Lett. B 30 1650085
Google Scholar
[21] Pal K, Paul S, Ray D S 2020 Phys. Rev. E 101 052203
Google Scholar
[22] Scarabotti P, Govezensky T, Bolcatto P 2020 Sci. Rep. 10 124451
[23] Boccaletti S, Latora V, Moreno Y, Chavez M, Hwang D U 2006 Phys. Rep. 424 175
Google Scholar
[24] Li C X, Dong L F, Feng J Y, Huang Y P 2019 Phys. Plasmas 26 023505
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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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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Google Scholar
Feng J Y, Dong L F, Wei L Y 2016 Chin. J. Chromatogr. 37 1076
Google Scholar
[35] Dong L F, Liu W L, Wang H F, He Y F, Fan W L, Gao R L 2007 Phys. Rev. E 76 046210
Google Scholar
[36] Dai D, Zhao X F, Wang Q M 2014 EPL 107 15002
Google Scholar
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Google Scholar
Wang X Q, Dai D, Hao Y P, Li L C 2012 Acta Phys. Sin. 61 230504
Google Scholar
[38] Zhang J, Wang Y H, Wang D Z, Zhuang J 2014 Plasma Sci. Technol. 16 110
Google Scholar
[39] Dong L F, Li B, Lu N, Li X C, Shen Z K 2012 Phys. Plasmas 19 052304
Google Scholar
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