Jiangbo Zhou, Lixin Tian
New travelling wave solutions to the Fornberg-Whitham equation are investigated. They are characterized by two parameters. The expresssions for the periodic and solitary wave solutions are obtained.
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In this paper, we employ the bifurcation method of dynamical systems to investigate the exact travelling wave solutions for the Fornberg-Whitham equation. The implicit expression for solitons is given. The explicit expressions for peakons and periodic cusp wave solutions are also obtained. Further, we show that the limits of soliton solutions and periodic cusp wave solutions are peakons.
In this paper, by using bifurcation method, we successfully find the Fornberg-Whitham equation has a type of traveling wave solutions called kink-like wave solutions and antikinklike wave solutions. They are defined on some semifinal bounded domains and possess properties of kink waves and anti-kink waves. Their implicit expressions are obtained. For some concrete data, the graphs of the implicit functions are displayed, and the numerical simulation is made. The results show that our theoretical analysis agrees with the numerical simulation.
Orbital Stability of Smooth Traveling Solitary Waves to the Fornberg-Whitham Equation
本文研究Fornberg-Whitham方程的光滑孤立波解的轨道稳定性，采用变分方法证明部分解具有轨道稳定性。
We consider a class of pseudodifferential evolution equations of the form $$u_t + (n(u) + Lu)_x = 0,$$ in which $L$ is a linear smoothing operator and $n$ is at least quadratic near the origin; this class includes in particular the Whitham equation. A family of solitary-wave solutions is found using a constrained minimisation principle and concentration-compactness methods for noncoercive functionals. The solitary waves are approximated by (scalings of) the corresponding solutions to partial differential equations arising as weakly nonlinear approximations; in the case of the Whitham equation …
The Whitham equation is a nonlocal shallow water-wave model which combines the quadratic nonlinearity of the KdV equation with the linear dispersion of the full water wave problem. Whitham conjectured the existence of a highest, cusped, traveling-wave solution, and his conjecture was recently verified in the periodic case by Ehrnström and Wahlén. In the present paper we prove it for solitary waves. Like in the periodic case, the proof is based on global bifurcation theory but with several new challenges. In particular, the small-amplitude limit is singular and cannot be handled using regular b…
Solitary waves of moderate amplitude and dispersive radiation in the Serre equations: the extended KdV-Whitham approximation
研究中等振幅孤立波在SSSGN方程中的行为，通过扩展KdV-Whitham近似和慢空间公式化方法进行建模与数值比较。
This paper considers the propagation of shallow-water solitary and nonlinear periodic waves over a gradual slope with bottom friction in the framework of a variable-coefficient Korteweg-de Vries equation. We use the Whitham averaging method, using a recent development of this theory for perturbed integrable equations. This general approach enables us not only to improve known results on the adiabatic evolution of isolated solitary waves and periodic wave trains in the presence of variable topography and bottom friction, modeled by the Chezy law, but also importantly, to study the effects of th…
Whitham modulation equations for the regularized Boussinesq equation with cubic nonlinearity
研究正则Boussinesq方程作为Fermi-Pasta-Ulam晶格的色散长波（准连续）近似，分类了显式周期行波解，并推导了描述周期行波解慢调制的Whitham调制方程，分析了其凸性及非线性特性，揭示了周期行波的调制不稳定性。
Whitham modulation theory for the Zakharov-Kuznetsov equation and transverse instability of its periodic traveling wave solutions
本文推导了Zakharov-Kuznetsov方程的Whitham调制方程，证明其周期行波解均线性不稳定，给出最不稳定波数增长率显式表达式，并通过数值与解析验证。
Solitary wave-mean flow interaction in strongly nonlineardispersive shallow water waves
本文利用 Whitham 调制理论和 Riemann 不变量解析研究了 SGN 方程中孤立波与平均流的相互作用，揭示了孤立波的捕获与透射机制，并证明了基于 DSW 拟合的近似方法具有二阶精度。
We derive an asymptotic formula for the amplitude distribution in a fully nonlinear shallow-water solitary wave train which is formed as the long-time outcome of the initial-value problem for the Su-Gardner (or one-dimensional Green-Naghdi) system. Our analysis is based on the properties of the characteristics of the associated Whitham modulation system which describes an intermediate "undular bore" stage of the evolution. The resulting formula represents a "non-integrable" analogue of the well-known semi-classical distribution for the Korteweg-de Vries equation, which is usually obtained thro…
We are concerned with numerical approximations of breather solutions for the cubic Whitham equation which arises as a water-wave model for interfacial waves. The model combines strong nonlinearity with the non-local character of the water-wave problem. The equation is non-integrable as suggested by the inelastic interaction of solitary waves. As a non local model, it generalizes, in the low frequency limit, the well known modified KdV (mKdV) equation which is a completely-integrable model. The mKdV equation has breather solutions, i.e. periodic in time and localized in space biparametric solut…
Solitary waves and kinks in FPU lattices with soft-hard-soft trilinear interactions
本文研究具有软-硬-软三线性非对称力-应变关系的FPU晶格，通过非线性映射不动点方法求解孤立波、超声速扭结及平顶孤立波等行波解，并在零弹性模量退化情形下获得显式紧致解，揭示了Whitham激波的形成及解的稳定性特征。
This paper presents a theoretical and experimental study of the long-standing fluid mechanics problem involving the temporal resolution of a large, localised initial disturbance into a sequence of solitary waves. This problem is of fundamental importance in a range of applications including tsunami and internal ocean wave modelling. This study is performed in the context of the viscous fluid conduit system-the driven, cylindrical, free interface between two miscible Stokes fluids with high viscosity contrast. Due to buoyancy induced nonlinear self-steepening balanced by stress induced interfac…
A study of variational single solitary waves governed by the conservative-extended KdV equation with applications to shallow water dispersive shocks
本文通过变分方法研究了由保守扩展KdV方程支配的单孤立波解，其方法更简洁且适用于实际问题，通过与数值模拟对比验证了理论预测与数值结果的一致性。
The interaction of localised solitary waves with large-scale, time-varying dispersive mean flows subject to nonconvex flux is studied in the framework of the modified Korteweg-de Vries (mKdV) equation, a canonical model for nonlinear internal gravity wave propagation in stratified fluids. The principal feature of the studied interaction is that both the solitary wave and the large-scale mean flow -- a rarefaction wave or a dispersive shock wave (undular bore) -- are described by the same dispersive hydrodynamic equation. A recent theoretical and experimental study of this new type of dynamic s…
Obliquely interacting solitary waves and wave wakes in free-surface flows
本文针对描述浅海表面与内波的Benney--Luke方程，结合Whitham调制理论推导孤子演化相关方程与解析公式，验证了其与KP方程的一致性及数值吻合度，还得到受迫BL方程远场近似下的圆弧形前驱波前解。
Dam breaks in the discrete nonlinear Schrödinger equation
研究离散非线性薛定谔方程中坝破现象的动力学，揭示离散化阈值及丰富的波模式，包括Whitham激波、DSW等。
On shallow water non-convex dispersive hydrodynamics: the extended KdV model
本文研究浅水波理论中扩展 KdV（eKdV）方程的非凸色散流体动力学，探讨色散激波与共振波列的形成机制，扩展色散激波拟合方法与等振幅近似，并引入 Whitham 激波解，理论预测与数值解高度一致。
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