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Research article

Asymptotic behavior of a viscous incompressible fluid flow in a fractal network of branching tubes

  • We considered a viscous incompressible fluid flow in a varying bounded domain consisting of branching thin cylindrical tubes whose axes are line segments that form a network of pre-fractal curves constituting an approximation of the Sierpinski gasket. We supposed that the fluid flow is driven by volumic forces and governed by Stokes equations with boundary conditions for the velocity and the pressure on the wall of the tubes and inner continuity conditions for the normal velocity on the interfaces between the junction zones and the rest of the pipes. We constructed local perturbations, related to boundary layers in the junction zones, from solutions of Leray problems in semi-infinite cylinders representing the rescaled junctions. Using Γ-convergence methods, we studied the asymptotic behavior of the fluid as the radius of the tubes tends to zero and the sequence of the pre-fractal curves converges in the Hausdorff metric to the Sierpinski gasket. Based on the constructed local perturbations, we derived, according to a critical parameter related to a typical Reynolds number of the flow in the junction zones, three effective flow models in the Sierpinski gasket, consisting of a singular Brinkman flow, a singular Darcy flow, and a flow with constant velocity.

    Citation: Haifa El Jarroudi, Mustapha El Jarroudi. Asymptotic behavior of a viscous incompressible fluid flow in a fractal network of branching tubes[J]. Communications in Analysis and Mechanics, 2024, 16(3): 655-699. doi: 10.3934/cam.2024030

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  • We considered a viscous incompressible fluid flow in a varying bounded domain consisting of branching thin cylindrical tubes whose axes are line segments that form a network of pre-fractal curves constituting an approximation of the Sierpinski gasket. We supposed that the fluid flow is driven by volumic forces and governed by Stokes equations with boundary conditions for the velocity and the pressure on the wall of the tubes and inner continuity conditions for the normal velocity on the interfaces between the junction zones and the rest of the pipes. We constructed local perturbations, related to boundary layers in the junction zones, from solutions of Leray problems in semi-infinite cylinders representing the rescaled junctions. Using Γ-convergence methods, we studied the asymptotic behavior of the fluid as the radius of the tubes tends to zero and the sequence of the pre-fractal curves converges in the Hausdorff metric to the Sierpinski gasket. Based on the constructed local perturbations, we derived, according to a critical parameter related to a typical Reynolds number of the flow in the junction zones, three effective flow models in the Sierpinski gasket, consisting of a singular Brinkman flow, a singular Darcy flow, and a flow with constant velocity.



    Soliton theory is a branch of nonlinear science and is widely used in various fields of physical science. Over the past decades, with the rapid development of soliton theory, the use of numerical analysis and scientific computing in mathematical physics has attracted considerable attention, especially for solving real-world problems [1,2,3,4,5,6]. Accordingly, interest in studies related to exact solutions is likely to increase in the field of nonlinear mathematics, where extracted solutions are of considerable significance for furthering our understanding of nonlinear wave dynamics in applications such as optical fibers [3,4], magneto-electro-elastic circular rod [5] and multifaceted bathymetry [6]. Inelastic interactions of traveling waves play an important role in various complex physical phenomena. It is known that related physical phenomena could be simulated using nonlinear evolution equations (NLEEs) under certain constraints. Furthermore, the inelastic interactions can be represented by resonant multi-soliton solutions. The findings are expected to contribute to a better understanding of wave propagation in fields such as optics, plasmas and fluid mechanics [7,8,9,10,11,12,13,14,15,16,17,18,19]. Although various reliable approaches have been proposed, obtaining exact resonant soliton solutions and identifying inelastic interactions remains a major challenge for researchers in the field of soliton theory. Past studies have focused on finding exact solutions in mathematical physics to better explain and understand mechanisms underlying physical phenomena. Fortunately, two state-of-the-art approaches, namely the simplified linear superposition principle (LSP) [9,10,11,12,13,14,15,16,17,18,19] and velocity resonance (VR) [20,21,22,23,24,25,26,27,28,29], have been developed to deal with inelastic interactions based on two resonant mechanisms. Importantly, two recent studies have detailed the special connection between a resonant multi-soliton solution and a soliton molecule [15,29]. The results obtained in these studies provided new information about different types of wave solutions, and the studies showed that the obtained solutions were accurate.

    Very recently, Ma [7] developed a new fourth-order nonlinear model, which is as follows:

    N(u)=α[3(uxut)x+uxxxt]+β[3(uxuy)x+uxxxy]+δ1uyt         +δ2uxx+δ3uxt+δ4uxy+δ5uyy=0, (1.1)

    where α,β and δj(j=1,2,3,4,5) are variable coefficients. Notably, the study of the formulation of new NLEEs and the simultaneous determination of their exact wave solutions has attracted considerable attention, and newly constructed equations and solutions are helpful for simulating the propagation of traveling waves. Moreover, the obtained results could help unravel the nature of nonlinearity in various sciences [30,31,32,33,34,35,36,37,38,39,40,41,42,43]; examples of such studies are those of Wazwaz [42] and Ma [43]. Resonant multi-soliton solutions are mainly used to simulate inelastic collisions of multi-wave solutions, which are relevant to real-world problems. To the best of our knowledge, there are few studies on the model in Eq (1.1). By determining the specific values of the free coefficients, we can reduce the model in Eq (1.1) to a variety of well-known NLEEs used in shallow-water wave theory and Jimbo–Miwa (JM) classification [16,19,30,32,40,41,43], such as the Hirota–Satsuma–Ito (HSI) [19,43], Calogero–Bogoyavlenskii–Schiff (CBS) [30,32], JM equations [16,41] and the references therein. However, a variety of models that are likely to be useful in mathematical physics and that have hitherto been unreported can be derived from Eq (1.1). For determining the mechanism of the resonant wave and for constructing new NLEEs, this study derived several models from Eq (1.1). Furthermore, in order to determine the exact resonant multi-soliton solutions for different cases, we employed the simplified LSP and VR to examine the extended equations.

    The objectives of this work were twofold. First, we identified specific conditions of Eq (1.1) and used them along with the simplified LSP to determine the existence of resonant multi-soliton solutions. Second, the extracted new equations and solutions were examined using VR, and the particular conditions for displaying the soliton molecules were formally confirmed.

    The LSP is an effective tool for obtaining resonant N-wave solutions with the aid of the Hirota bilinear form [9,10,11,12]. The constraint guaranteeing the existence of resonant solutions is that wave numbers should satisfy the related bilinear equation.

    L(kikj,lilj,mimj,ωiωj)=0,1ijN. (2.1)

    Solving Eq (2.1) is considerably difficult for highly nonlinear partial equations, (i.e., high-dimensional high-order equations), and it involves a considerable amount of tedious calculations. In order to reduce the complex calculations and simultaneously increase the accuracy of the extracted results, we present the simplified version of the LSP. Detailed algorithms can be found in recent works [13,14,15,16,17,18,19,29]. Herein, we briefly illustrate the main steps of the simplified LSP.

    Step 1. Extract the dispersion relation of the examined equation as

    ω=F(k,l,m,ω), (2.2)

    where k,l,m and ω are wave numbers, and η=kx+ly+mz++ωt.

    Step 2. From the formula form of the dispersion relation, we can intuitively conjecture the corresponding wave numbers to be

    ki=ki,li=akλi,ωi=bkμi, (2.3)

    where λ and μ are powers of ki, and a and b are real constants to be determined later. Importantly, μ should be consistent with the one obtained by substituting ki=ki and li=akλi into Eq (2.2).

    Substituting Eq (2.3) into Eq (2.1) and solving the equation yields the values of λ,μ,a and b, and the resonant N-wave solutions can be directly constructed.

    In [4], the expression u=2(lnf)x was used to transform Eq (1.1) into the bilinear form

    (αD3xDt+βD3xDy+δ1DyDt+δ2D2x+δ3DxDt+δ4DxDy+δ5D2y)ff=0. (3.1)

    After applying the algorithms mentioned in Section 2, we thoroughly investigated Eq (3.1) and divided the constraints into two cases, which guarantees the existence of resonant multi-soliton solutions to the corresponding equations.

    Case 1.

    β=δ3=δ4=δ5=0, (3.2)

    and

    ki=ki,li=ak3i,ωi=bk1i. (3.3)

    Using Eq (2.1) and substituting Eqs (3.2) and (3.3) into Eq (3.1), we obtain

    αb(kikj)3(k1ik1j)+abδ1(k3ik3j)(k1ik1j)+δ2(kikj)2=0. (3.4)

    We solve this equation and obtain

    a=αδ1,b=δ23α, (3.5)

    and

    ξi=kixαδ1k3iyδ23αk1it. (3.6)

    Then, the corresponding equation and resonant multi-soliton solution can be constructed as

    α[3(uxut)x+uxxxt]+δ1uyt+δ2uxx=0, (3.7)
    u=2(lnf)x=2(ln(Ni=1eξi))x. (3.8)

    Specifying α=δ1=δ2=1 in Eq (3.7) gives the HSI equation, and the results are consistent with our report in [19].

    Case 2.

    δ1=δ3=0,δ2+aδ4+a2δ5=0, (3.9)

    and

    ki=ki,li=aki,ωi=bki. (3.10)

    Using Eqs (3.9) and (3.10) and proceeding as before, we obtain

    α(kikj)3b(kikj)+a(k3ik3j)β(kikj)=0. (3.11)

    Clearly, from this equation, we can obtain

    αb+aβ=0, (3.12)

    where the free coefficients α and b can be determined by specifying values for δ2,δ4 and δ5 in Eq (3.9). For example, specifying δ2=δ5=1 and δ4=2 yields

    a=1,b=βα. (3.13)

    Thus, the corresponding equation and resonant multi-soliton solution can be constructed as

    α[3(uxut)x+uxxxt]+β[3(uxuy)x+uxxxy]+δ2uxx+δ4uxy+δ5uyy=0, (3.14)
    u=2(lnf)x=2(ln(Ni=1eξi))x, (3.15)

    where

    ξi=kix+akiy+bkit. (3.16)

    Equations (3.6) and (3.16) are constructed with distinct physical structures. In other words, they represent different traveling waves. Hence, the corresponding nonlinear wave equations (3.7) and (3.14) describe different physical phenomena, respectively.

    We recall that in [15,29], the VR conditions (kikj,lilj) were

    kikj=lilj=ωiωj. (3.17)

    Using the related dispersion relation of Eq (3.7) [15,29], we obtain

    αk3jωj+δ1ljωj+δ2k2j=0. (3.18)

    Equation (3.17) can be used to solve Eq (3.18), and the wave numbers can then be obtained as

    kj=±kiαωi(δ1liωik2i+δ2),lj=±l2iαkiωi(δ1liωik2i+δ2),ωj=±ωiαki(δ1liωik2i+δ2). (3.19)

    Thus, VR is successfully used to extract the wave numbers in Eq (3.19) to soliton molecules. In what follows, we show that the solutions (3.3) and (3.5) are consistent with the VR conditions (3.17) and (3.19).

    Specifying α=δ1=δ2=1 and substituting Eqs (3.3) and (3.5) into (3.19) yields

    kj=±2ki,lj=±2k3i,ωj=±23k1i. (3.20)

    Apparently, the result (3.20) reveals that the results (3.3), (3.5) and (3.19) are perfect because of the relationship

    kikj=lilj=ωiωj=±12. (3.21)

    In other words, by choosing the appropriate values for the free parameters ki,li and ωi, the two approaches give the same results. Equation (3.19) can be used to simulate the dynamics of soliton molecules, and Eq (3.21) revealed that the special connection between resonant multi-soliton and soliton molecule is considered as one kink wave

    u=2(ln(ekix+liy+ωit+e2kix2liy2ωit))x. (3.22)

    Case 1 guarantees the existence of resonant multi-soliton solutions by using the simplified LSP and VR. Moreover, the derived Eq (3.7) with variable coefficients provides many more versions of mathematical models than the constant-coefficient equation [19]. Notably, VR cannot be used for Case 2 since for the special conditions in (3.9), the corresponding dispersion relation is obtained as αωi=βli; similar cases were reported in [15].

    In this work, a novel fourth-order (2+1)-dimensional nonlinear wave equation was investigated using the LSP and VR. The following results were obtained.

    (ⅰ) Equation (3.1) was examined in detail by using the simplified LSP, and it was confirmed that the two reduced equations (3.7) and (3.14) guarantee the existence of a resonant multi-soliton solution. The results were double checked by using VR. Moreover, compared to the methods reported in the critical references [44,45], the simplified LSP is found to be much easier to use to generate the exact resonant multi-soliton solutions without resorting to computational software. In other words, by applying the simplified LSP with the dispersion relationship, researchers can handle the examined nonlinear NLEEs directly. Furthermore, the accuracy of exact multi-soliton solutions can be checked by substituting the wave numbers into the phase shift term and making the phase shift term vanish, and detailed explanations can be found in the literature [16,17,18,19].

    (ⅱ) Compared with the existing HSI equation [19], Eq (3.7) in Case 1 can be considered as a general form of the HSI equation. Furthermore, we found that Case 2 cannot be solved using VR because its dispersion relation is αωi=βli, which is consistent with the work reported in [15]. Importantly, a literature survey showed that Eq (3.14) is new, and it may be of great help in studying real-world nonlinear wave problems.

    (ⅲ) By assigning specific values to the free parameters in solutions (3.6), (3.8), (3.15) and (3.16), we can simulate a variety of inelastic interactions of Y-type multi-soliton waves by using the mathematical software MATLAB. Moreover, the dynamic characteristics of the obtained solution (3.8) can be determined by considering the distinct values of free parameters presented in Figures 14. Figure 1(a1)(a4) shows 3D plots of the solution (3.8) in the (x, y)-plane for N=2,N=3,N=4 and N=5 and correspondingly gives one kink, 2-kink, 3-kink and 4-kink waves, respectively. Figure 2(a1)(a4) shows the contour plots corresponding to Figure 1(a1)(a4). It is apparent from Figures 1 and 2 that when N3, the solution (3.8) signifies a multi-kink wave. From the above observations, we found that the number of stripes increased with N at t=0. Figure 3 presents the splitting propagation of a traveling 2-kink wave at different times in solution (3.8) for N=3. In Figures 3 and 4, 3D plots and their corresponding contour graphs for different times, namely, t=200,50,0,50 and 200, are displayed. It is remarkable that the graphs and plots show the fission behavior when time (t) increases. In particular, the ki value affects the amplitude and speed of the traveling wave. Accordingly, the kink wave is split into two waves that travel at different speeds. The upward kink wave moves faster than the other one. Furthermore, in Figures 5 and 6, 3D plots and their corresponding contour graphs with α=0.1,α=0.5,α=1,α=3,α=10 are displayed, where the nonlinear term α influences the traveling wave speed and the initiation time of splitting. The result is consistent with Eq (3.6). Similar results can be obtained for N=4 and N=5.

    Figure 1.  Three-dimensional plots of multi-kink waves described by the solution (3.8) for (a1) N=2, (a2) N=3, (a3) N=4 and (a4) N=5 when k1=0.25, k2=0.50, k3=0.75, k4=1.00, k5=1.25, α=1, δ1=δ2=1 and t=0.
    Figure 2.  Panels (a1)–(a4) correspond to the contour plots (a1)–(a4) in Figure 1, respectively.
    Figure 3.  Fission of traveling 2-kink wave by the solution (3.8) with k1=0.25, k2=0.50, k3=0.75, α=1 and δ1=δ2=1 at (a1) t=200, (a2) t=50, (a3) t=0, (a4) t=50 and (a5) t=200.
    Figure 4.  Panels (a1)–(a5) correspond to the contour plots (a1)–(a5) in Figure 3, respectively.
    Figure 5.  The effect of nonlinear term α to the traveling 2-kink wave by the solution (3.8) with k1=0.25, k2=0.50, k3=0.75, t=0 and δ1=δ2=1 at (a1) α=0.1, (a2) α=0.5, (a3) α=1, (a4) α=3 and (a5) α=10.
    Figure 6.  Panels (a1)–(a5) correspond to the contour plots (a1)–(a5) in Figure 5, respectively.

    (ⅳ) Other equations derived from Eq (1.1) may provide multi-soliton, lump and rogue wave solutions, but they should be free from resonant multi-soliton solutions, such as the CBS and JM equations [30,31,32]. The main reason for this is that the related wave numbers are constructed as ki±kj=0; the related works can be found in [1,15,19,30].

    In summary, this study investigated resonant Y-type multi-soliton solutions and the soliton molecules for the fourth-order nonlinear wave equation (1.1) by using the simplified LSP and VR. The results of multi-soliton solutions and the soliton molecule for the generated equations (3.7) and (3.14) are discussed. In case 1, under the specified constraints, Eq (3.7) provides resonant Y-type multi-soliton solutions and the soliton molecule. On the basis of past studies, Eq (3.7) can be considered as a general variable-coefficient HSI equation. In case 2, Eq (3.14) can be considered as a novel nonlinear wave model. However, under certain constraints, Eq (3.14) provides only resonant multi-soliton solutions, without any soliton molecule, because of the corresponding dispersion relation constructed as αωi=βli. Notably, the results demonstrate the fact that the ki value affects the amplitude and the speed of the traveling wave; furthermore, the nonlinear term α influences the traveling wave speed and the initiation time of splitting.

    To the best of our knowledge, the presented resonant Y-type waves and equations are new and have not been reported before. This study presents comprehensive results and contributes significantly to existing knowledge in nonlinear wave dynamics. The presented simplified LSP and VR are direct, concise and effective mathematical tools for generating resonant multi-soliton solutions and soliton molecules. Finally, the newly formulated equations (3.7) and (3.14) will boost the study of resonant multi-wave solutions. The soliton molecule is a special kind of N-soliton solution, and the dynamic characteristics of nonlinear traveling waves play an important role in studying real-world problems. Therefore, investigating the dynamical behaviors of soliton molecules, lump waves, and rogue waves associated with these equations are worth further exploring in future studies.

    This work was supported by the Ministry of National Defense, Taiwan, and the Ministry of Science and Technology, Taiwan, under grant number MOST 111-2221-E-013-002.

    The authors declare that they have no conflict of interest.



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