Exact solutions of a(2+1)-dimensional extended shallow water wave equation

We give the bilinear form and n-soliton solutions of a（2+1）-dimensional [（2+1）-D] extended shallow water wave（eSWW） equation associated with two functions v and r by using Hirota bilinear method. We provide solitons, breathers,and hybrid solutions of them. Four cases of a crucial φ（y）, which is an arbitrary real continuous function appeared in f of bilinear form, are selected by using Jacobi elliptic functions, which yield a periodic solution and three kinds of doubly localized dormion-type solution. The first order Jacobi-type solution travels parallelly along the x axis with the velocity（3k12+ α, 0） on（x, y）-plane. If φ（y） = sn（y, 3/10）, it is a periodic solution. If φ（y） = cn（y, 1）, it is a dormion-type-Ⅰ solutions which has a maximum（3/4）k1p1 and a minimum-（3/4）k1p1. The width of the contour line is ln■. If φ（y） = sn（y, 1）, we get a dormion-type-Ⅱ solution（26） which has only one extreme value-（3/2）k1p1. The width of the contour line is ln■. If φ（y） = sn（y, 1/2）/（1 + y2）, we get a dormion-type-Ⅲ solution（21） which shows very strong doubly localized feature on（x, y） plane. Moreover, several interesting patterns of the mixture of periodic and localized solutions are also given in graphic way.

A more general form of lump solution,lumpoff,and instanton/rogue wave solutions of a reduced (3+1)-dimensional nonlinear evolution equation

In this manuscript,a reduced(3+1)-dimensional nonlinear evolution equation is studied.We first construct the bilinear formalism of the equation by using the binary Bell polynomials theory,then explore a lump solution to the special case for z=x.Furthermore,a more general form of lump solution of the equation is found which possesses seven arbitrary parameters and four constraint conditions.By cutting the lump by the induced soliton(s),lumpoff and instanton/rogue wave solutions are also constructed by the more general form of lump solution.

Residual symmetry, CRE integrability and interaction solutions of two higher-dimensional shallow water wave equations

Two(3+1)-dimensional shallow water wave equations are studied by using residual symmetry and the consistent Riccati expansion(CRE) method. Through localization of residual symmetries, symmetry reduction solutions of the two equations are obtained. The CRE method is applied to the two equations to obtain new B?cklund transformations from which a type of interesting interaction solution between solitons and periodic waves is generated.

Modified (2+1)-dimensional displacement shallow water wave system and its approximate similarity solutions

Recently, a new （2＋1）-dimensional shallow water wave system, the （2＋1）-dlmenslonal displacement shallow water wave system （2DDSWWS）, was constructed by applying the variational principle of the analytic mechanics in the Lagrange coordinates. The disadvantage is that fluid viscidity is not considered in the 2DDSWWS, which is the same as the famous Kadomtsev-Petviashvili equation and Korteweg-de Vries equation. Applying dimensional analysis, we modify the 2DDSWWS and add the term related to the fluid viscidity to the 2DDSWWS. The approximate similarity solutions of the modified 2DDSWWS （M2DDSWWS） is studied and four similarity solutions are obtained. For the perfect fluids, the coefficient of kinematic viscosity is zero, then the M2DDSWWS will degenerate to the 2DDSWWS.

Rogue Waves and Lump Solitons of the(3+1)-Dimensional Generalized B-type Kadomtsev–Petviashvili Equation for Water Waves

In this paper, the(3+1)-dimensional generalized B-type Kadomtsev–Petviashvili equation for water waves is investigated. Through the Hirota method and Kadomtsev–Petviashvili hierarchy reduction, we obtain the first-order,higher-order, multiple rogue waves and lump solitons based on the solutions in terms of the Gramian. The first-order rogue waves are the line rogue waves which arise from the constant background and then disappear into the constant background again, while the first-order lump solitons propagate stably. Interactions among several first-order rogue waves which are described by the multiple rogue waves are presented. Elastic interactions of several first-order lump solitons are also presented. We find that the higher-order rogue waves and lump solitons can be treated as the superpositions of several first-order ones, while the interaction between the second-order lump solitons is inelastic.

On the Quasi-Periodic Wave Solutions and Asymptotic Analysis to a(3+1)-Dimensional Generalized Kadomtsev–Petviashvili Equation

In this paper, a(3+1)-dimensional generalized Kadomtsev–Petviashvili(GKP) equation is investigated,which can be used to describe many nonlinear phenomena in fluid dynamics and plasma physics. Based on the generalized Bell's polynomials, we succinctly construct the Hirota's bilinear equation to the GKP equation. By virtue of multidimensional Riemann theta functions, a lucid and straightforward way is presented to explicitly construct multiperiodic Riemann theta function periodic waves(quasi-periodic waves) for the(3+1)-dimensional GKP equation. Interestingly,the one-periodic waves are well-known cnoidal waves, which are considered as one-dimensional models of periodic waves.The two-periodic waves are a direct generalization of one-periodic waves, their surface pattern is two-dimensional that they have two independent spatial periods in two independent horizontal directions. Finally, we analyze asymptotic behavior of the multiperiodic periodic waves, and rigorously present the relationships between the periodic waves and soliton solutions by a limiting procedure.

New Bilinear B?cklund Transformation and Higher Order Rogue Waves with Controllable Center of a Generalized(3+1)-Dimensional Nonlinear Wave Equation

In this paper, we first obtain a bilinear form with small perturbation u_0 for a generalized(3+1)-dimensional nonlinear wave equation in liquid with gas bubbles. Based on that, a new bilinear B?cklund transformation which consists of four bilinear equations and involves seven arbitrary parameters is constructed. After that, by applying a new symbolic computation method, we construct the higher order rogue waves with controllable center to the generalized(3+1)-dimensional nonlinear wave equation. The rogue waves present new structure, which contain two free parametersα and β. The dynamic properties of the higher order rogue waves are demonstrated graphically. The graphs tell that the parameters α and β can control the center of the rogue waves.

广义(3+1)维浅水波方程新周期波解（英文）

应用新三波法和Hirota双线型研究了一类广义(3+1)维浅水波方程.通过选取两组不同参数值,获得了它的新周期波解,进一步,给出这些解的图形以说明这些解的物理结构特征.

广义(3+1)维浅水波方程的Painlevé可积与新的复合解

广义(3+1)维浅水波方程是数学与物理学中重要方程之一。首先,利用Painlevé分析法证明了广义(3+1)维浅水波方程在Painlevé意义下的可积性;其次,根据截断的Painlevé展开式得到了广义(3+1)维浅水波方程与线性方程之间的Bäcklund变换;最后,通过Hirota双线性方法,得到了广义(3+1)维浅水波方程新的复合解。

两类(3+1)维广义BKP方程的Multiple exp-函数方法解

本文借助Multiple exp-函数法和齐次平衡原理,求解了两类(3+1)维广义BoussinesqKadomtsev-Petviashvili(BKP)方程,获得了其指数型函数波解.根据参数的任意性,对参数取不同的值,得到了方程不同类型的扭子波解和孤子波解.作为例子,借助Maple分别给出了不同情况下两种特殊类型的波解的图像.通过图像,能够更直观地理解两类广义BKP方程解的特点,这将对后期进行相关方面的研究和涉及广义BKP方程的工程领域的研究有着一定的参考价值.

广义(3+1)-维浅水波方程的3种Grammian解

孤子方程的多孤子解可表示成Grammian形式的行列式解,进而写成Pfaff的形式,从而在求解双线性方程以及证明中可以直接把解代入方程进行验证。借助于Pfaff式技巧,得到了广义(3+1)-维浅水波方程的3种不同Grammian解。

扩展的同宿检验法与(3+1)维广义KP方程的非行波解

扩展的同宿检验法是求解非线性偏微分方程精确解非常有效的方法.该文将扩展的同宿检验法与分离变量方法相结合,探索(3+1)维广义KP方程的非行波精确解.借助数学软件工具,讨论了4种情形下的非行波精确解.进而,通过分析系数在实数域、复数域中的取值情况,得到了(3+1)维广义KP方程15种类型的精确非行波解.

扩展的(3+1)维浅水波方程的新精确解

高维非线性偏微分方程在自然科学领域有着重要的应用,研究高维非线性偏微分方程的精确解是非常有价值的工作。利用一个特定的周期函数结合符号计算软件得到了扩展的(3+1)维浅水波方程的新精确解,并选定合适的参数通过三维图和密度图展示了部分解的物理结构和性质。

2+ 1维广义浅水波方程的类孤子解与周期解

该文基于一个Riccati方程组,提出了一个新的广义投影Riccati展开法,该方法直接简单并能构造非线性微分方程更多的新的解析解.利用该算法研究了(2+1)维广义浅水波方程,并求得了许多新的精确解,包括类孤子解和周期解.该算法也能应用到其它非线性微分方程中.

(2+1)维广义浅水波方程类孤子解和类周期解(英文)

在Riccati方程方法的基础上提出了新的广义投射Riccati方程展开法及其算法.该方法直接而有效,通过适当的变换将非线性发展方程转化为易于求解的微分方程组,从而可用来构造非线性发展方程更多新的精确解.利用这个方法研究了(2+1)维浅水波方程,并得到了许多新的精确解,其中包括类孤子解和类周期解.该算法可以用于构造其他更多非线性发展方程(组)的精确解.

(2+1)维浅水波方程的新精确解

对(2+1)维浅水波方程的现有解进行了推广.应用CK方法对方程进行求解,得到方程的Backlund变换公式,将已知解代入公式,求得一些新的精确解,从而推广了浅水波方程的解.

构造(2+1)维扩展浅水波方程的新奇精确解

本文研究了(2+1)维扩展浅水波方程,通过变量变换得到双线性形式.基于符号计算,获得一类新奇精确解.这些解包含一个任意实函数φ(y),选择特殊的函数φ(y)得到了这些解的动态图,孤子传播表明含有φ(y)的孤子比没有φ(y)的孤子更一般,并且φ(y)可以影响孤子解的特征.

广义(2+1)维浅水波类方程的反应解与呼吸解

利用广义双线性方法研究广义(2+1)维浅水波类方程。借助符号软件Mathematica得到了该方程的19类反应解、5类呼吸解。对一类反应解和一类呼吸解,当参数取特定值时通过它们的三维图进行分析,发现随时间t的变化,lump与孤子的反应效应图以及变化趋势。由此,说明了广义(2+1)维浅水波类方程解的丰富性和部分解的特性。

Abundant closed form wave solutions to some nonlinear evolution equations in mathematical physics

The propagation of waves in dispersive media,liquid flow containing gas bubbles,fluid flow in elastic tubes,oceans and gravity waves in a smaller domain,spatio-temporal rescaling of the nonlinear wave motion are delineated by the compound Korteweg-de Vries(KdV)-Burgers equation,the(2+1)-dimensional Maccari system and the generalized shallow water wave equation.In this work,we effectively derive abundant closed form wave solutions of these equations by using the double(G′/G,1/G)-expansion method.The obtained solutions include singular kink shaped soliton solutions,periodic solution,singular periodic solution,single soliton and other solutions as well.We show that the double(G′/G,1/G)-expansion method is an efficient and powerful method to examine nonlinear evolution equations(NLEEs)in mathematical physics and scientific application.

3+1维广义Kadomtsev-Petviashvili方程的Riemann-theta函数解

借助变量之间的变换,将3+1维广义Kadomtsev-Petviashvili方程化成双线性形式.利用多维Riemann-theta函数和双线性形式相结合的方法,获得所得方程的单Riemann-theta函数解和双Riemann-theta函数解.更进一步,对所有得的解进行渐近性讨论.另一方面,利用Hirota方法求出该方程的单奇异解和二奇异解,并借助数学软件画出解得图像.