Min Chen, Olivier Goubet
In this paper, we study various dissipative mechanics associated with the Boussinesq systems which model two-dimensional small amplitude long wavelength water waves. We will show that the decay rate for the damped one-directional model equations, such as the KdV and BBM equations, holds for some of the damped Boussinesq systems which model two-directional waves.
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In this article we consider the Boussinesq system supplemented with some dissipation terms. These equations model the propagation of a waterwave in shallow water. We prove the existence of a global smooth attractor for the corresponding dynamical system.
Asymptotic stability for monotone traveling kinks of the dissipative Boussinesq problem
研究耗散Boussinesq问题中单调递减行进扭结解的轨道稳定性和渐近稳定性，证明其在H^1中轨道稳定，在齐次Sobolev空间和L^p中渐近稳定。
We consider the Cauchy problem for an evolution equation modeling bidirectional surface waves in a convecting fluid. Under small condition on the initial value, the existence and asymptotic behavior of global solutions in some time weighted spaces are established by the contraction mapping principle.
Dispersive-Dissipative estimates for Boussinesq and other generalized wave equations
针对一类广义波动方程（特别是粘性Boussinesq方程），推导了与相位函数几何假设及低高频退化相关的色散-耗散估计，并分析了耗散对解衰减率的影响。
In this paper we establish local-in-time existence and uniqueness of strong solutions in $H^s$ for $s > \frac{n}{2}$ to the viscous, zero thermal-diffusive Boussinesq equations in $\mathbb{R}^n , n = 2,3$. Beale-Kato-Majda type blow-up criterion has been established in three-dimensions with respect to the $BMO$-norm of the vorticity. We further prove the local-in-time existence and blow-up criterion for non-viscous and fully ideal Boussinesq systems. Commutator estimates due to Kato and Ponce (1988) \cite {KP} and Fefferman et. al. (2014) \cite {Fe} play important roles in the calculations.
The three-dimensional incompressible Boussinesq system is one of the important equations in fluid dynamics. The system describes the motion of temperature-dependent incompressible flows. And the temperature naturally has diffusion. Recently, Elgindi, Ghoul and Masmoudi constructed a $C^{1,α}$ finite time blow-up solutions for Euler systems with finite energy. Inspired by their works, we constructed $C^{1,α}$ finite time blow-up solution for Boussinesq equations where the temperature has diffusion and finite energy. Generally speaking, the diffusion of temperature smooths the solution of the sy…
Large time behavior for the nonlinear dissipative Boussinesq equation
本文研究全空间中非线性耗散Boussinesq方程，通过WKB与Fourier分析导出线性化模型最优估计，并利用分数阶插值证明非线性模型小数据Sobolev解的全局存在性，给出大时间增长与衰减估计及新渐近轮廓。
We consider the initial value problem for the inviscid Primitive and Boussinesq equations in three spatial dimensions. We recast both systems as an abstract Euler-type system and apply the methods of convex integration of De Lellis and Székelyhidi to show the existence of infinitely many global weak solutions of the studied equations for general initial data. We also introduce an appropriate notion of dissipative solutions and show the existence of suitable initial data which generate infinitely many dissipative solutions.
The classical theory of water waves is based on the theory of inviscid flows. However it is important to include viscous effects in some applications. Two models are proposed to add dissipative effects in the context of the Boussinesq equations, which include the effects of weak dispersion and nonlinearity in a shallow water framework. The dissipative Boussinesq equations are then integrated numerically.
Norm Inflation for Inviscid and Fully Dissipative Boussinesq Systems in Supercritical Spaces
研究二维Boussinesq系统在超临界Besov空间的范数膨胀，通过分析无粘和全耗散系统在特定条件下的情况，得出范数膨胀发生在密度分量\(\rho\)且速度分量\(u\)有界等结论，覆盖多数满足条件的超临界空间。
We consider a dissipative, dispersive system of Boussinesq type, describing wave phenomena in settings where dissipation has an effect. Examples include undular bores in rivers or oceans where dissipation due to turbulence is important for their description. We show that the model system admits traveling wave solutions known as diffusive-dispersive shock waves, and we categorize them into oscillatory and regularized shock waves depending on the relationship between dispersion and dissipation. Comparison of numerically computed solutions with laboratory data suggests that undular bores are accu…
In this article, we study the long time behavior of solutions of a variant of the Boussinesq system in which the equation for the velocity is parabolic while the equation for the temperature is hyperbolic. We prove that the system has a global attractor which retains some of the properties of the global attractors for the 2D and 3D Navier-Stokes equations. Moreover, this attractor contains infinitely many invariant manifolds in which several universal properties of the Batchelor, Kraichnan, Leith theory of turbulence are potentially present.
On the attractor of the semi-dissipative Boussinesq equations revised
研究具有粘性且无热扩散的二维Boussinesq方程的弱σ吸引子\(\mathcal{A}\)结构，证明其在温度分量投影是满射，且对任意\(r>0\)，\(\mathcal{A}_r\)在速度分量投影含无限维希尔伯特椭球。
This paper is concerned with the asymptotic stability of certain stationary solution to Boussinesq equations without thermal conduction in the infinite flat strip $Ω=\mathbb{R}\times (0,1)$. It is shown that the solution starting from initial data close to the stationary solution will converge to it with explicit algebraic rates as time tends to infinity.
The water wave theory traditionally assumes the fluid to be perfect, thus neglecting all effects of the viscosity. However, the explanation of several experimental data sets requires the explicit inclusion of dissipative effects. In order to meet these practical problems, the theory of visco-potential flows has been developed (see P.-F. Liu & A. Orfila (2004) and D. Dutykh & F. Dias (2007)). Then, usually this formulation is further simplified by developing the potential in an entire series in the vertical coordinate and by introducing thus, the long wave approximation. In the present study we…
We investigate the asymptotic stability of solution to Boussinesq equations without thermal conduction with the initial data near a specific stationary solution in the three--dimensional domain $Ω= \mathbb{R}^{2}\times (0,1)$. It is shown that the solution starting from a small perturbation to the stationary solution converges to it with explicit algebraic rates as time tends to infinity.
On Asymptotic Properties of the Boussinesq Equations
本文研究了 Boussinesq 系统的长时间行为，通过构造解验证了先前得到的先验界。
On the existence of solutions to generalized Navier--Stokes--Fourier system with dissipative heating
针对高温度梯度下Oberbeck--Boussinesq系统的不足，研究带耗散加热的广义Navier--Stokes--Fourier系统，证明其耗散适宜弱解的大数据长时间存在性，为后续稳定性分析奠定基础。
Suppression of Fluid Echoes and Sobolev Stability Threshold for 2D Dissipative Fluid Equations Around Couette Flow
本文研究了围绕Couette流的2D耗散流体方程的Sobolev稳定性阈值，通过证明一般非线性交互的界将非线性稳定性证明简化为线性分析，并应用于Navier-Stokes、Boussinesq和MHD方程，提升了后两者的稳定性阈值。
We address the asymptotic properties for the Boussinesq equations with vanishing thermal diffusivity in a bounded domain with no-slip boundary conditions. We show the dissipation of the $L^2$ norm of the velocity and its gradient, convergence of the $L^2$ norm of $Au$, and an $o(1)$-type exponential growth for $\Vert A^{3/2}u\Vert_{L^2}$. We also obtain that in the interior of the domain the gradient of the vorticity is bounded by a polynomial function of time.
We consider the 2D Boussinesq equations with a velocity damping term in a strip $\mathbb{T}\times[-1,1]$, with impermeable walls. In this physical scenario, where the \textit{Boussinesq approximation} is accurate when density/temperature variations are small, our main result is the asymptotic stability for a specific type of perturbations of a stratified solution. To prove this result, we use a suitably weighted energy space combined with linear decay, Duhamel's formula and "bootstrap" arguments.
In this paper, we first address the space-time decay properties for higher order derivatives of strong solutions to the Boussinesq system in the usual Sobolev space. The decay rates obtained here are optimal. The proof is based on a parabolic interpolation inequality, bootstrap argument and some weighted estimates. Secondly, we present a new solution integration formula for the Boussinesq system, which will be employed to establish the existence of strong solutions in scaling invariant function spaces. We further investigate the asymptotic profiles and decay properties of these strong solution…
Long-time asymptotics of the good Boussinesq equation and its modified version: Painlevé region
针对Painlevé区域内良Boussinesq方程与修正Boussinesq方程的初值问题，采用Deift-Zhou最速下降法结合Miura变换推导两类方程的长时间渐近公式与首阶项，经数值模拟验证了渐近分析结果的准确性。
We consider an initial boundary value problem of the multi-dimensional Boussinesq equations in the absence of thermal diffusion with velocity damping or velocity diffusion under the stress free boundary condition in horizontally periodic strip domain. We prove the global-in-time existence of classical solutions in high order Sobolev spaces satisfying high order compatibility conditions around the linearly stratified equilibrium, the convergence of the temperature to the asymptotic profile, and sharp decay rates of the velocity field and temperature fluctuation in all intermediate norms based o…
In this article we prove highly improved and flexible Strichartz-type estimates allowing us to generalize the asymptotics we obtained for a stratified and rotating incompressible Navier-Stokes system: for large (and less regular) initial data, we obtain global well-posedness, asymptotics (as the Rossby number $ε$ goes to zero) and convergence rates as a power of the small parameter $ε$. Our approach is lead by the special structure of the limit system: the 3D quasi-geostrophic system.
We obtain a family of nonlinear maximum principles for linear dissipative nonlocal operators, that are general, robust, and versatile. We use these nonlinear bounds to provide transparent proofs of global regularity for critical SQG and critical d-dimensional Burgers equations. In addition we give applications of the nonlinear maximum principle to the global regularity of a slightly dissipative anti-symmetric perturbation of 2d incompressible Euler equations and generalized fractional dissipative 2d Boussinesq equations.
The aim of this article is to extend previous works about the asymptotics of an ill-prepared fast rotating, highly stratified incompressible Navier-Stokes system. Thanks to improved Strichartz estimates, we are able not only to cover a case which was unanswered in our previous work (allowing bigger ill-prepared initial data) but also to reduce some assumptions on the initial data. In passing we also widen the range of some parameters and compare two methods to obtain dispersive estimates.
In this paper, we study the asymptotic stability for the two-dimensional Navier-Stokes Boussinesq system around the Couette flow with small viscosity $ν$ and small thermal diffusion $μ$ in a finite channel. In particular, we prove that if the initial velocity and initial temperature $(v_{in},ρ_{in})$ satisfies $\|v_{in}-(y,0)\|_{H_{x,y}^2}\leq \e_0 \min\{ν,μ\}^{\f12}$ and $\|ρ_{in}-1\|_{H_x^{1}L_y^2}\leq \e_1 \min\{ν,μ\}^{\f{11}{12}}$ for some small $\e_0,\e_1$ independent of $ν, μ$, then for the solution of the two-dimensional Navier-Stokes Boussinesq system, the velocity remains within $O(\m…
J.-Y. Chemin proved the convergence (as the Rossby number $ε$ goes to zero) of the solutions of the Primitive Equations to the solution of the 3D quasi-geostrophic system when the Froude number F = 1 that is when no dispersive property is available. The result was proved in the particular case where the kinematic viscosity $ν$ and the thermal diffusivity $ν$ ' are close. In this article we generalize this result for any choice of the viscosities, the key idea is to rely on a special feature of the quasi-geostrophic structure.
This work deals with the local rapid exponential stabilization for a Boussinesq system of KdV-KdV type introduced by J. Bona, M. Chen and J.-C. Saut. This is a model for the motion of small amplitude long waves on the surface of an ideal fluid. Here, we will consider the Boussinesq system of KdV-KdV type posed on a finite domain, with homogeneous Dirichlet--Neumann boundary controls acting at the right end point of the interval. Our goal is to build suitable integral transformations to get a feedback control law that leads to the stabilization of the system. More precisely, we will prove that …
Mechanical balance laws for two-dimensional Boussinesq systems
本文针对二维弱非线性弱色散Boussinesq系统，利用两种渐近展开对质量、动量和能量的近似力学平衡律进行严格数学论证，并通过数值实验验证近似阶数。
Fractional regularity, global persistence, and asymptotic properties of the Boussinesq equations on bounded domains
该研究针对二维Boussinesq系统的长时间行为，构造了光滑有界域上的全局持续解，推导了速度和密度的渐近性质并给出收敛到稳态的充要条件，证明采用抛物型极大正则性和初始相容性条件。
We analyze the spectral stability of small-amplitude, periodic, traveling-wave solutions of a Boussinesq-Whitham system. These solutions are shown numerically to exhibit high-frequency instabilities when subject to bounded perturbations on the real line. We use a formal perturbation method to estimate the asymptotic behavior of these instabilities in the small-amplitude regime. We compare these asymptotic results with direct numerical computations. This is the second paper in a series of three that investigates high-frequency instabilities of Stokes waves.
Asymptotic long-time behavior of Darcy--Boussinesq convection in layered porous media with narrow transition zones
研究多层多孔介质中达西-布西埃对流的渐近长期行为，证明了全局吸引子、不变测度和努塞尔数的收敛性，并扩展了有限时间收敛理论至长期领域。
Hidden asymptotics for the weak solutions of the strongly stratified Boussinesq system without rotation
本文针对无旋转强分层Boussinesq系统，通过引入非常规初始数据和新的Strichartz估计，得到了依赖热扩散系数的更丰富渐近行为，证明了弱解收敛性并给出收敛速率，还可导出相关全局存在性结果。
Linear and nonlinear stability for the $3$D stratified Boussinesq equations with the horizontal viscosity and diffusivity
本文研究具有水平粘性和热扩散率的稳定分层流体$3$D Boussinesq方程的大时间行为，利用各向异性Littlewood--Paley理论获得精确的$L^1$-$L^p$衰减估计，揭示了分层斜对称项的色散效应和速度场第三分量的增强耗散效应。
Stability for the Boussinesq Equations with Horizontal Dissipation near the Hydrostatic Balance on $\mathbb{R}^2$
研究二维平面上近静水平衡处仅具水平耗散的Boussinesq方程，利用速度-温度耦合产生内重力波及色散衰减与水平耗散构成稳定机制，并对特定初始扰动建立经典解全局存在唯一性及给出速度和温度衰减率。
We consider the long time behavior of weak and strong solutions of the n-dimensional viscous Boussinesq system in the half space, with $n\geq3$ . The $L^r(R^n_+)$-asymptotics of strong solutions and their first three derivatives, with $1\leq r\leq\infty$, are derived combining $L^q-L^r$ estimates and properties of the fractional powers of the Stokes operator. For the $L^\infty-$asymptotics of the second order derivatives the unboundedness of the projection operator $P: L^\infty(R^n_+)\rightarrow L^\infty_σ(R^n_+)$ is dealt by an appropriate decomposition of the nonlinear term.
We compute the sharp time decay rates of the solutions of the IVP for quasi-geostrophic equation and the Boussinesq model, subject to fractional dissipation. Moreover, we explicitly identify the asymptotic profiles, the kernel of the $α$ stable processes, which are analogues of the Oseen vortices.
A refined long time asymptotic bound for 3D axially symmetric Boussinesq system with zero thermal diffusivity
本文改进了三维轴对称零热扩散Boussinesq系统解的长时间渐近上界，证明了速度场Sobolev范数的代数增长及在势条件下的有界性，并给出了温度波动和更高阶范数的更优增长估计。
In this paper, we study the nonlinear asymptotic stability of the Couette flow in the stably stratified regime, namely the Richardson number $γ^2>\frac{1}{4}$. Precisely, we prove that if the initial perturbation $(u_{in},\vartheta_{in})$ of the Couette flow $v_s=(y,0)$ and the linear temperature $ρ_s=-γ^2y+1$ satisfies $\|u_{in}\|_{H^{s+1}}+\|\vartheta_{in}\|_{H^{s+2}}\leq ε_0ν^{\frac{1}{2}}$, then the asymptotic stability holds.
We study here some asymptotic models for the propagation of internal and surface waves in a two-fluid system. We focus on the so-called long wave regime for one dimensional waves, and consider the case of a flat bottom. Starting from the classical Boussinesq/Boussinesq system, we introduce a new family of equivalent symmetric hyperbolic systems. We study the well-posedness of such systems, and the asymptotic convergence of their solutions towards solutions of the full Euler system. Then, we provide a rigorous justification of the so-called KdV approximation, stating that any bounded solution o…
This study deals with higher-ordered asymptotic equations for the water-waves problem. We considered the higher-order/extended Boussinesq equations over a flat bottom topography in the well-known long wave regime. Providing an existence and uniqueness of solution on a relevant time scale of order $1/\sqrt{\eps}$ and showing that the solution's behavior is close to the solution of the water waves equations with a better precision corresponding to initial data, the asymptotic model is well-posed in the sense of Hadamard. Then we compared several water waves solitary solutions with respect to the…
In this paper we deal with the long time existence for the Cauchy problem associated to BBM-type Boussinesq systems of equations which are asymptotic models for long wave, small amplitude gravity surface water waves. As opposed to previous papers devoted to the long time existence issue, we consider initial data with nontrivial behaviour at innity which may be used to model bore propagation.
New asymptotics for strong solutions of the strongly stratified Boussinesq system without rotation and for large ill-prepared initial data
本文将强分层 Boussinesq 系统在 Froude 数趋于零时的极限系统结果从弱 Leray 型解推广至强 Fujita-Kato 型解，针对大范围振荡的不适定初始数据获得了更优的收敛率。
In this paper, we study the existence and asymptotic properties of the traveling vortex pairs for the two-dimensional inviscid incompressible Boussinesq equations. We construct a family of traveling vorticity pairs, which constitutes the de-singularization of a pair of point vortices with equal intensity but opposite sign. Using the improved vorticity method, we also give limiting position of the supports of vorticities.
Asymptotic stability of the 2D Boussinesq equations around Couette flow in infinite channel
本文针对无限通道中Couette流周围的二维Boussinesq系统，通过两层频率依赖时间分解和增强耗散效应，证明了在特定初始扰动条件下系统存在全局渐近稳定解。
The "good'' Boussinesq equation: long-time asymptotics
针对直线上“良态”Boussinesq方程初值问题，借助逆散射技术将解表示为3×3矩阵Riemann-Hilbert问题的解，通过Deift-Zhou最速下降分析其正则化形式，得到解的长时间渐近公式。
In a recent paper, we showed that the large $(x,t)$ behavior of a class of physically relevant solutions of Boussinesq's equation for water waves is described by ten main asymptotic sectors. In the sector adjacent to the positive $x$-axis, referred to as Sector I, we stated without proof an exact expression for the leading asymptotic term together with an error estimate. Here we provide a proof of this asymptotic formula.
In this paper we deal with the long time existence for the Cauchy problem associated to some asymptotic models for long wave, small amplitude gravity surface waves. We generalize some of the results that can be found in the literature devoted to the study of Boussinesq systems by implementing an energy method on spectrally localized equations. In particular, we obtain better results in terms of the regularity level required to solve the initial value problem on large time scales.
Remarks on the smoothness of the $C^{1,α}$ asymptotically self-similar singularity in the 3D Euler and 2D Boussinesq equations
本文通过精心设计的初始扰动和加权Hölder估计，将三维欧拉和二维Boussinesq方程的$C^{1,\alpha}$自相似奇点构造推广到仅在一点不光滑的情形，并建立了相应的BKM型延拓准则。
In this article we consider the asymptotic stability of the two-dimensional Boussinesq equations with partial dissipation near a combination of Couette flow and temperature profiles $T(y)$. As a first main result we show that if $T'$ is of size at most $ν^{1/3}$ in a suitable norm, then the linearized Boussinesq equations with only vertical dissipation of the velocity but not of the temperature are stable. Thus, mixing enhanced dissipation can suppress Rayleigh-Bénard instability in this linearized case. We further show that these results extend to the (forced) nonlinear equations with vertica…
Long time stability and instability in the two-dimensional Boussinesq system with kinematic viscosity
本文研究二维Boussinesq系统在周期通道中的长时间行为，证明静水平衡在低正则扰动下不稳定，并利用新发现的Lyapunov泛函建立分层密度的渐近稳定性。
In this paper we study the Cauchy problem for the generalized Boussinesq equation with initial data in modulation spaces $M^{s}_{p^\prime,q}(\mathbb{R}^n),$ $n\geq 1.$ After a decomposition of the Boussinesq equation in a $2\times 2$-nonlinear system, we obtain the existence of global and local solutions in several classes of functions with values in $ M^s_{p,q}\times D^{-1}JM^s_{p,q}$ spaces for suitable $p,q$ and $s,$ including the special case $p=2,q=1$ and $s=0.$ Finally, we prove some results of scattering and asymptotic stability in the framework of modulation spaces.
Through Borel summation methods, we analyze two different variations of the Navier-Stokes equation --the Boussinesq equation and the magnetic Benard equation. This method has previously been applied to the Navier-Stokes equation. We prove that an equivalent system of integral equations in each case has a unique solution, which is exponentially bounded for p in R^{+}, p being the Laplace dual variable of 1/t. This implies the local existence of a classical solution in a complex t-region that includes a real positive time (t)-axis segment. In this formalism, global existence of PDE solutions bec…
In this article we consider the stability and damping problem for the 2D Boussinesq equations with partial dissipation near a two parameter family of stationary solutions which includes Couette flow and hydrostatic balance. In the first part we show that for the linearized problem in an infinite periodic channel the evolution is asymptotically stable if any diffusion coefficient is non-zero. In particular, this imposes weaker conditions than for example vertical diffusion. Furthermore, we study the interaction of shear flow, hydrostatic balance and partial dissipation. In a second part we adap…
Local existence of solutions and blow-up criteria for the Boussinesq equations in Lei-Lin-Gevrey Spaces
本文在Lei-Lin和Lei-Lin-Gevrey空间中研究三维分数阶Boussinesq方程的局部适定性和有限时间爆破行为，通过不动点论证和Fourier估计得到解的存在唯一性，并建立爆破准则和范数增长下界。
On asymptotic stability of stable Good Boussinesq solitary waves
本文研究一维广义 Good-Boussinesq 模型，通过引入运动环境下的新 virial 估计和混合变量处理方法，证明了在一般初始数据和特定速度条件下稳定 GB 孤立波的渐近稳定性。
In this paper, we study the viscous Boussinesq equation in the whole space $\mathbb{R}^n$, which describes the propagation of small amplitude and long waves on the surface of water with viscous effects. Concerning the linearized Cauchy problem, some qualitative properties of solutions including $L^m-L^q$ estimates with $1\leqslant m\leqslant q\leqslant \infty$, inviscid limits and asymptotic profiles of solution with respect to the small viscosity are investigated by means of the Fourier analysis and the WKB method. For another, by applying some fractional order interpolations in the harmonic …
In this paper, we consider the Boussinesq equations with magnetohydrodynamics convection in the domain $\mathbb{T} \times \mathbb{R}$ and establishes the nonlinear stability of the Couette flow $(\mathbf{u}_{sh} = (y,0), \mathbf{b}_{sh} = (1,0), p_{sh} = 0, θ_{sh} = 0$). The novelty in this paper is that we design a new Fourier multiplier operator by using the properties of the enhanced dissipation to overcome the difficult term $\partial_{xy}(-Δ)^{-1}j$ in the linearized and nonlinear system. Then, we prove the asymptotic stability for the linearized system. Finally, we establish the nonlinea…
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