Jamel Benameur, Lotfi Jlali
In this paper we prove, if $u$ is a global solution to Navier-Stokes equations in the Sobolev-Gevrey spaces $H^1_{a,σ}(\mathbb R^3)$, then $\|u(t)\|_{H^1_{a,σ}}$ decays to zero as time goes to infinity. Fourier analysis is used.
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In \cite{JB1}, Benameur proved a blow-up result of the non regular solution of $(NSE)$ in the Sobolev-Gevrey spaces. In this paper we improve this result, precisely we give an exponential type explosion in Sobolev-Gevrey spaces with less regularity on the initial condition. Fourier analysis is used.
In this paper, we prove that there exists a unique global solution of $3D$ Navier-Stokes equation if $\exp(a|D|^{1/σ})u^0\in{\mathcal{X}}^{-1}(\mathbb R^3)$ and $\|u^0\|_{\mathcal{X}^{-1}}<ν$. Moreover, we will show that $\|\exp(a|D|^{1/σ}) u(t)\|_{\mathcal{X}^{-1}}$ goes to zero if the time $t$ goes to infinity.
In this paper, we study the asymptotic behavior of solutions to the three-dimensional incompressible Navier-Stokes equations (NSE) with periodic boundary conditions and potential body forces. In particular, we prove that the Foias-Saut asymptotic expansion for the regular solutions of the NSE in fact holds in {\textit{all Gevrey classes}}. This strengthens the previous result obtained in Sobolev spaces by Foias-Saut. By using the Gevrey-norm technique of Foias-Temam, the proof of our improved result simplifies the original argument of Foias-Saut, thereby, increasing its adaptability to other d…
A priori bounds for Gevrey-Sobolev norms of space-periodic three-dimensional solutions to equations of hydrodynamic type
我们提出了一种技术推导的先验界的空间周期三维解的Gevrey-Sobolev范数的发展偏微分方程的流体动力类型。它涉及傅立叶空间中的流速的变换，其在范数的指数和变换后的解的范数之间引入反馈，并且导致出现温和耗散项。为了说明这种技术，我们推导出有限时间的界限Gevrey-Sobolev范数的解决方案的欧拉和无粘Burgers方程，和全球的Voigt型正则化的欧拉和Navier-斯托克斯方程的时间界限（假设各自的范数的初始条件是有界的）。范数的有界性意味着解在空间中的解析性。
It is well known that the Prandtl boundary layer equation is instable, and the well-posedness in Sobolev space for the Cauchy problem is an open problem. Recently, under the Oleinik's monotonicity assumption for the initial datum, [1] have proved the local well-posedness of Cauchy problem in Sobolev space (see also [21]). In this work, we study the Gevrey smoothing effects of the local solution obtained in [1]. We prove that the Sobolev's class solution belongs to some Gevrey class with respect to tangential variables at any positive time.
In this paper we study the weighted Gevrey class regularity of Euler equation in the whole space R 3. We first establish the local existence of Euler equation in weighted Sobolev space, then obtain the weighted Gevrey regularity of Euler equation. We will use the weighted Sobolev-Gevrey space method to obtain the results of Gevrey regularity of Euler equation, and the use of the property of singular operator in the estimate of the pressure term is the improvement of our work.
Gevrey regularity for the supercritical quasi-geostrophic equation
本文采用Foias和Temam的方法，以“临界”索伯列夫空间为初值，建立了超临界准地转方程解在全空间上的Gevrey类正则性.此外，我们得到的Gevrey类是“近最优”的，作为推论，我们得到的时间衰减率的高阶Sobolev规范的解决方案。与Navier-Stokes方程或亚临界准地转方程不同，低耗散对建立Gevrey正则性造成了困难。一个新的交换子估计Gevrey类，涉及并矢Littlewood-Paley算子，建立，使我们能够利用方程的取消属性，规避这一困难。
Exponential blow-up of mild solutions to the fractional Boussinesq equations in the Gevrey class
研究分数耗散波西莫诺方程在格维雷类中的温和解存在性与唯一性，并揭示解在接近最大时间时的指数爆炸行为。
We show that the fifth-order Kadomtsev-Petviashvili II equation is globally well-posed in an anisotropic Gevrey space, which complements earlier results on the well-posedness of this equation in anisotropic Sobolev spaces.
Gevrey regularity for a class of dissipative equations with analytic nonlinearity
本文建立了一类具有解析非线性项的耗散方程在全空间上解的Gevrey类正则性。这推广了Ferrari和Titi在周期空间的情况下，初始数据在$L^2-$为基础的索伯列夫空间的$L^p$设置和整个空间的结果。我们的推广还包括考虑粗糙的初始数据，在负索伯列夫空间在某些情况下，包括Navier-Stokes方程和亚临界准地转方程，并允许耗散算子是一个分数拉普拉斯算子。此外，我们得到全球（在时间上）估计Gevrey规范产生的高阶导数的衰减是最佳的。应用程序包括（时间）衰减的解决方案，在较高的Sobolev规范的一个大类的方程，包括Navier-斯托克斯方程，亚临界准地转方程，非线性热方程的分数耗散，一个变种的Burgers方程的立方或高阶非线性，和广义Cahn-Hilliard方程。最后三种情况下的衰减结果似乎是新的，而我们的方法提供了一个替代的证明最近获得的$L^p\, (1<p<2)$衰减结果的Navier-斯托克斯方程的Bae，Biswas和Tadmor。这些应用程序遵循我们的全球Gevrey正则性结果的初始数据在\emph{critical spaces}与低规律性。
After defining classical weighted modulation spaces we show some basic properties. In this work we additionally choose an approach in terms of the frequency-uniform decomposition and a discussion on the weights of modulation spaces leads to a definition of Gevrey-modulation spaces, where we leave the Sobolev frame and proceed to the Gevrey frame in order to get better results. We prove that Gevrey-modulation spaces are algebras under multiplication. Moreover, we obtain a non-analytic superposition result which gives rise to discuss the possibility to apply Gevrey-modulation spaces to non-linea…
In a recent article Jia established linear inviscid damping in Gevrey regularity for compactly supported Gevrey regular shear flows in a finite channel, which is of great interest in view of existing nonlinear results. In this article we provide an alternative very short proof of stability in Gevrey regularity as a consequence of stability in high Sobolev regularity. Here, we consider both the setting of a finite channel with compactly supported perturbations and of an infinite channel without this restriction. Furthermore, we consider the setting where perturbations vanish only of finite orde…
In this paper we prove that the Cauchy problem for first-order quasi-linear systems of partial differential equations is ill-posed in Gevrey spaces, under the assumption of an initial ellipticity. The assumption bears on the principal symbol of the first-order operator. Ill-posedness means instability in the sense of Hadamard, specifically an instantaneous defect of Hölder continuity of the flow from $G^σ$ to $L^2$, where $σ\in(0,1)$ depends on the initial spectrum. Building on the analysis carried out by G. Métivier [\textit{Remarks on the well-posedness of the nonlinear Cauchy problem}, Cont…
Motivated by \cite{DG19}, we prove the global existence and large time behavior of small solutions to 2-D Prandtl system for data with Gevrey 2 regularity in the $x$ variable and Sobolev regularity in the $y$ variable. In particular, we extend the global well-posedness result in \cite{PZ5} for 2-D Prandtl system with analytic data to data with optimal Gevery regularity in the sense of \cite{Ger1}.
Well-posedness of the compressible boundary layer equations with data in the Gevrey class
本文研究压缩边界层方程在Gevrey-2空间中的适定性，通过引入辅助函数和消去机制，证明了在切向变量上的Gevrey-2空间和法向变量上的Sobolev正则性下的局部存在性和唯一性。
The present paper analyzes a spectral regularization of a time-reversed reaction-diffusion problem with globally and locally Lipschitz nonlinearities. This type of inverse and ill-posed problems arises in a variety of real-world applications concerning heat conduction and tumour source localization. In accordance with the weak solvability result for the forward problem, we focus on the inverse problem with high-order Sobolev-Gevrey smoothness and with Sobolev measurements. As expected from the well-known results for the linear case, we prove that this nonlinear spectral regularization possesse…
In the paper, we study the Prandtl system with initial data admitting non-degenerate critical points. For any index $σ\in[3/2, 2],$ we obtain the local in time well-posedness in the space of Gevrey class $G^σ$ in the tangential variable and Sobolev class in the normal variable so that the monotonicity condition on the tangential velocity is not needed to overcome the loss of tangential derivative. This answers the open question raised in the paper of D. Gérard-Varet and N. Masmoudi [{\it Ann. Sci. Éc. Norm. Supér}. (4) 48 (2015), no. 6, 1273-1325], in which the case $σ=7/4$ is solved.
In this paper, we study local well-posedness for the Navier-Stokes equations (NSE) with the arbitrary initial value in homogeneous Sobolev-Lorentz spaces $\dot{H}^s_{L^{q, r}}(\mathbb{R}^d):= (-Δ)^{-s/2}L^{q,r}$ for $d \geq 2, q > 1, s \geq 0$, $1 \leq r \leq \infty$, and $ \frac{d}{q}-1 \leq s < \frac{d}{q}$, this result improves the known results for $q > d,r=q, s = 0$ (see M. Cannone (1995) and M. Cannone and Y. Meyer (1995)) and for $q =r= 2, \frac{d}{2} - 1 < s < \frac{d}{2}$ (see M. Cannone (1995, J. M. Chemin (1992)). In the case of critical indexes ($s=\frac{d}{q}-1$), we prove global …
Large scale dynamics of the oceans and the atmosphere are governed by the primitive equations (PEs). It is well-known that the three-dimensional viscous PEs is globally well-posed in Sobolev spaces. On the other hand, the inviscid PEs without rotation is known to be ill-posed in Sobolev spaces, and its smooth solutions can form singularity in finite time. In this paper, we extend the above results in the presence of rotation. First, we construct finite-time blowup solutions to the inviscid PEs with rotation, and establish that the inviscid PEs with rotation is ill-posed in Sobolev spaces in th…
In this manuscript, we study the theory of conformal relativistic viscous hydrodynamics introduced in arXiv:1708.06255, which provided a causal and stable first-order theory of relativistic fluids with viscosity. The local well-posedness of its equations of motion has been previously established in Gevrey spaces. Here, we improve this result by proving local well-posedness in Sobolev spaces.
Optimal Gevrey stability of hydrostatic approximation for the Navier-Stokes equations in a thin domain
本文研究了薄区域中 Navier-Stokes 系统的流体静力近似，利用独立于 ε 的方法验证了在最优 Gevrey 指标 3/2 下的极限，并证明了系统的适定性，改进了已有结果。
We investigate the stability of boundary layer solutions of the two-dimensional incompressible Navier-Stokes equations. We consider shear flow solutions of Prandtl type : $$ u^ν(t,x,y) \, = \, \big (U^E(t,y) + U^{BL}(t,\frac{y}{\sqrtν})\,, \, 0 \big )\, , \quad 0<ν\ll 1\,. $$ We show that if $U^{BL}$ is monotonic and concave in $Y = y /\sqrtν$ then $u^ν$ is stable over some time interval $(0,T)$, $T$ independent of $ν$, under perturbations with Gevrey regularity in $x$ and Sobolev regularity in $y$. We improve in this way the classical stability results of Sammartino and Caflisch in analytic c…
This paper studies the dissipative generalized surface quasi-geostrophic equations in a supercritical regime where the order of the dissipation is small relative to order of the velocity, and the velocities are less regular than the advected scalar by up to one order of derivative. We also consider a non-degenerate modification of the endpoint case in which the velocity is less smooth than the advected scalar by slightly more than one order. The existence and uniqueness theory of these equations in the borderline Sobolev spaces is addressed, as well as the instantaneous smoothing effect of the…
In \cite{YZ}, the author proved the global existence of the two-dimensional anisotropic quasi-geostrophic equations with condition on the parameters $α,$ $β$ in the Sobolev spaces $H^s( \R^2)$; $s\geq 2$. In this paper, we show that this equations has a global solution in the spaces $H^s(\R^2)$, where $\max\{2-2α,2-2β\}< s<2$, with additional condition over $α$ and $β$. The proof is based on the Gevrey-class regularity of the solution in neighborhood of zero.
We consider the incompressible Euler equations on ${\mathbb R}^d$, where $d \in \{ 2,3 \}$. We prove that: (a) In Lagrangian coordinates the equations are locally well-posed in spaces with fixed real-analyticity radius (more generally, a fixed Gevrey-class radius). (b) In Lagrangian coordinates the equations are well-posed in highly anisotropic spaces, e.g.~Gevrey-class regularity in the label $a_1$ and Sobolev regularity in the labels $a_2,...,a_d$. (c) In Eulerian coordinates both results (a) and (b) above are false.
We show the $H^1$ stability of shear flows of Prandtl type: $U^ν= (U_s(y/\sqrtν),0)$, in the steady two-dimensional Navier-Stokes equations, under the natural assumptions that $U_s(Y) > 0$ for $Y > 0$, $U_s(0) = 0$, and $U_s'(0) > 0$. Our result is in sharp contrast with the unsteady ones, in which at most Gevrey stability can be obtained, even under global monotonicity and concavity hypotheses. It provides the first positive answer to the inviscid limit problem in Sobolev regularity for a non-trivial class of steady Navier-Stokes flows with no-slip boundary condition.
Optimal Gevrey regularity for supercritical quasi-geostrophic equations
针对带超临界耗散的二维地表类地转方程，本文证明临界 Sobolev 与 Besov 空间中大初值具有和线性部分同衰减指数的最优 Gevrey 正则性，解决了相关公开问题。
On nonlinear Landau damping and Gevrey regularity
本文研究了环面上Vlasov-Poisson方程的非线性Landau阻尼问题，证明了在大于Gevrey 3的正则类中关于$ε$一致的非线性稳定性，并构造了展现非线性Landau阻尼的Sobolev正则初始数据族。
Wave equation for sums of squares on compact Lie groups
本文研究紧李群上向量场平方和波动方程Cauchy问题的适定性。我们得到了局部索伯列夫空间中柯西问题解的正则性损失，这取决于Hörmander条件满足的顺序，但在全局定义的空间中没有损失。我们还建立Gevrey适定性方程的不规则系数和/或多个特征。与在索伯列夫空间中一样，如果在局部坐标中表述，我们观察到适定性，局部Gevrey阶的损失取决于Hörmander条件满足的阶数。
We study the theory of relativistic viscous hydrodynamics introduced in arXiv:1109.0985 and arXiv:1907.12695, which provided a causal and stable first-order theory of relativistic fluids with viscosity in the case of barotropic fluids. The local well-posedness of its equations of motion has been previously established in Gevrey spaces. Here, we improve this result by proving local well-posedness in Sobolev spaces.
Logarithmic bounds on Sobolev norms for time-dependent linear Schrödinger equations
我们证明了在1-D的增长的Sobolev范数的不定常的线性薛定谔方程是最多对数的时间为任何（固定）的潜力，这是分析（或Gevrey）。最近在[N]中证明了Sobolev范数几乎必然是无界的，这表明对数几乎必然是必要的。在[W]中，作者证明了对于显式时间周期势，Sobolev范数是有界的。这是在[N]意义下的例外集合中。本文与[N，W]一起给出了圆上不定常线性薛定谔方程的一个比较完整的图象.
Regularization by noise for the inviscid primitive equations
本文研究无粘原始方程的不适定性和有限时间爆破问题，证明引入随机扩散或随机阻尼噪声可以恢复局部适定性，并以高概率保证解的全局存在。
In this paper, we study the super-critical Quasi-Geostrophic equation in Gevrey-Sobolev space. We prove the local existence of $(QG)$ for any large initial data and we give an exponential type of Blow-up to the solution. Moreover, we establish the existence global for a small initial data and we show that $\|θ\|_{H^s_{a, α^{-1}}}$ decays to zero as time goes to infinity. Fourier analysis and standard techniques are used.
We consider linear and non-linear Cauchy equations in the context of Sobolev spaces. In particular, we show the global existence of solutions to the Kirchhoff equation with initial data in the Sobolev spaces, a problem that has been open for more than eighty years. Our proof is based on a new uniform estimate for solutions to the linear equation with time-dependent coefficient and a fixed point argument. As an immediate consequence of our result, the global solvability of the Kirchhoff equation with initial data in the Gevrey spaces is also obtained.
Global hypoellipticity for a class of time-periodic operators on asymptotically Euclidean manifolds
该研究在渐近欧几里得流形上引入时间周期Gevrey-Sobolev-Kato空间并研究其表征，进而应用于一类时间周期演化方程的全局亚椭圆性问题分析。
Quantitative aspects on the ill-posedness of the Prandtl and hyperbolic Prandtl equations
本文研究双曲型 Prandtl 方程在 Sobolev 空间中的不适定性，揭示 k^(1/3) 色散增长率，并证明在 Gevrey 类中可适定，通过放宽假设构造了不适定性的剪切流。
We prove that the theorem of Mouhot and Villani on Landau damping near equilibrium for the Vlasov-Poisson equations on $\mathbb{T}_x \times \mathbb{R}_v$ cannot, in general, be extended to high Sobolev spaces in the case of gravitational interactions. This is done by showing in every Sobolev space, there exists background distributions such that one can construct arbitrarily small perturbations that exhibit arbitrarily many isolated nonlinear oscillations in the density. These oscillations are known as plasma echoes in the physics community. For the case of electrostatic interactions, we demon…
On the vanishing viscosity limit for incompressible flows with inflow/outflow boundary conditions
该研究拓展了前人工作，针对具有一般流入-流出边界条件的不可压缩NSE，通过Prandtl型方程边界层校正子和高阶渐近展开，严格证明了粘性趋于零时其解在能量范数下收敛于EE解，且内部L²、H¹范数收敛速率与法向注入/抽吸情形一致。
In this paper we consider a semiclassical version of the wave equations with singular Hölder time-dependent propagation speeds on the lattice $\hbar\mathbb{Z}^{n}$. We allow the propagation speed to vanish leading to the weakly hyperbolic nature of the equations. Curiously, very much contrary to the Euclidean case considered by Colombini, de Giorgi and Spagnolo [2] and by other authors, the Cauchy problem, in this case, is well-posed in $\ell^2(\hbar\mathbb{Z}^{n})$. However, we also recover the well-posedness results in the intersection of certain Gevrey and Sobolev spaces in the limit of the…
We study the initial value problem for Schrödinger-type equations with initial data presenting a certain Gevrey regularity and an exponential behavior at infinity. We assume the lower order terms of the Schrödinger operator depending on $(t,x)\in[0,T]\times\R^n$ and complex valued. Under a suitable decay condition as $|x|\to\infty$ on the imaginary part of the first order term and an algebraic growth assumption on the real part, we derive global energy estimates in suitable Sobolev spaces of infinite order and prove a well posedness result in Gelfand-Shilov type spaces. We also discuss by exam…
(In)stability results for the Light Ray Transform
本文研究光射线变换的不稳定性，在Sobolev和Gevrey设定下给出定量下界，并利用平稳几何与磁系统关系证明时间矩的稳定性。
The Navier-Stokes equations for viscous, incompressible fluids are studied in the three-dimensional periodic domains, with the body force having an asymptotic expansion, when time goes to infinity, in terms of power-decaying functions in a Sobolev-Gevrey space. Any Leray-Hopf weak solution is proved to have an asymptotic expansion of the same type in the same space, which is uniquely determined by the force, and independent of the individual solutions. In case the expansion is convergent, we show that the next asymptotic approximation for the solution must be an exponential decay. Furthermore,…
We study the long-time dynamics of the Navier-Stokes equations in the three-dimensional periodic domains with a body force decaying in time. We introduce appropriate systems of decaying functions and corresponding asymptotic expansions in those systems. We prove that if the force has a large-time asymptotic expansion in Gevrey-Sobolev spaces in such a general system, then any Leray-Hopf weak solution admits an asymptotic expansion of the same type. This expansion is uniquely determined by the force, and independent of the solutions. Various applications of the abstract results are provided whi…
We consider a one-parameter family of beam equations with Hamiltonian non-linearity in one space dimension under periodic boundary conditions. In a unified functional framework we study the long time evolution of initial data in two categories of differentiability: (i) a subspace of Sobolev regularity, (ii) a subspace of infinitely many differentiable functions which is strictly contained in the Sobolev space but which strictly contains the Gevrey one. In both cases we prove exponential type times of stability. The result holds for almost all mass parameters and it is obtained by combining nor…
We investigate an abstract wave equation with a time-dependent propagation speed, and we consider both the non-dissipative case, and the case with a strong damping that depends on a power of the elastic operator. Previous results show that, depending on the values of the parameters and on the time regularity of the propagation speed, this equation exhibits either well-posedness in Sobolev spaces, or well-posedness in Gevrey spaces, or ill-posedness with severe derivative loss. In this paper we examine some critical cases that were left open by the previous literature, and we show that they fal…
The long time behavior of Wong-Zakai approximations of 2D as well as 3D non-autonomous stochastic convective Brinkman-Forchheimer (CBF) equations with non-linear diffusion terms on bounded and unbounded ($\mathbb{R}^d$ for $d=2,3$) domains is discussed in this work. To establish the existence of random pullback attractors, the concept of asymptotic compactness (AC) is used. In bounded domains, AC is proved via compact Sobolev embeddings. In unbounded domains, due to the lack of compact embeddings, the ideas of energy equations and uniform tail estimates are exploited to prove AC. In the litera…
Global analytic solutions of a pseudospherical Novikov equation
本文研究描述伪球面的Novikov方程，通过Sobolev空间全局适定性、Gevrey空间初值的新估计及Kato-Masuda定理得到解析半径下界，证明解在两变量上全局解析，并赋予对应条带伪球面相关的全局解析度量。
We study the long-time behavior of spatially periodic solutions of the Navier-Stokes equations in the three-dimensional space. The body force is assumed to possess an asymptotic expansion or, resp., finite asymptotic approximation, in either Sobolev or Gevrey spaces, as time tends to infinity, in terms of polynomial and decaying exponential functions of time. We establish an asymptotic expansion, or resp., finite asymptotic approximation, of the same type for the Leray-Hopf weak solutions. This extends the previous results, obtained in the case of potential forces, to the non-potential force c…
We study the long time asymptotic behavior of the inviscid magnetohydrodynamic equations with magnetic dissipation near a combination of Couette flow and a constant magnetic field. Here we show that there exist nearby explicit global in time low frequency solutions, which we call waves. Moreover, the linearized problem around these waves exhibits resonances under high frequency perturbations, called echoes, which result in norm inflation Gevrey regularity and infinite time blow-up in Sobolev regularity.
Improved lower bound for the radius of analyticity for the modified KdV equation
本文针对散焦 mKdV 方程，在带 cosh 权的 Gevrey 空间中构造新的几乎守恒律，证明解全局存在，并将空间解析半径下界改进为 cT^{-1/2}。
We prove Landau damping for the collisionless Vlasov equation with a class of $L^1$ interaction potentials (including the physical case of screened Coulomb interactions) on $\mathbb R^3_x \times \mathbb R^3_v$ for localized disturbances of an infinite, homogeneous background. Unlike the confined case $\mathbb T^3_x \times \mathbb R_v^3$, results are obtained for initial data in Sobolev spaces (as well as Gevrey and analytic classes). For spatial frequencies bounded away from zero, the Landau damping of the density is similar to the confined case. The finite regularity is possible due to an add…
Almost Global Solutions of Kirchhoff Equation
本文研究原始Kirchhoff方程，通过为无外部参数的无穷维可逆向量场构建有理标准型，证明了几乎任意小初值在Sobolev、Gevrey和解析空间中的几乎全局存在性与稳定性。
The long-time behavior of solutions of the three-dimensional Navier--Stokes equations in a periodic domain is studied. The time-dependent body force decays, as time $t$ tends to infinity, in a coherent manner. In fact, it is assumed to have a general and complicated asymptotic expansion which involves complex powers of $e^t$, $t$, $\ln t$, or other iterated logarithmic functions of $t$. We prove that all Leray-Hopf weak solutions admit an asymptotic expansion which is independent of the solutions and is uniquely determined by the asymptotic expansion of the body force. The proof makes use of t…
Non-harmonic analysis of the wave equation for Schrödinger operators with complex potential
本文研究具有复势的薛定谔算子波动方程，证明了算子谱的离散性以及柯西问题在 Sobolev 空间、Gevrey 空间和分布奇异性情形下的适定性。
Spatial smoothness of the stationary solutions of the 3D Navier--Stokes equations
针对带周期边界条件的三维Navier-Stokes方程，研究由确定性和随机外力驱动的平稳解的空间光滑性，通过Kolmogorov算子和Galerkin逼近证明解在固定时刻的分布支撑在比噪声高一个正则性的Sobolev空间或Gevrey空间中。
Large-Box Transition in Nonlinear Landau Damping for the Vlasov--Yukawa Equation
本文研究 Vlasov--Yukawa 方程在大盒子区域中的非线性朗道阻尼，证明全局稳定性、识别回声-Volterra 算子并给出 Sobolev 初值的收敛性结果。
Local and global existence for the stochastic Prandtl equation driven by multiplicative noises in two and three dimensions
本文研究二维和三维随机Prandtl方程的适定性，通过在余法向Sobolev空间中建立高阶估计克服随机情形下能量泛函无法路径控制的问题，并证明切向随机扩散能以高概率给出半径随时间线性增长的全局Gevrey-2解。
We study the asymptotic behavior of the forced linear Euler and nonlinear Navier-Stokes equations close to Couette flow in a periodic channel. As our main result we show that for smooth time-periodic forcing linear inviscid damping persists, i.e. the velocity field (weakly) asymptotically converges. However, stability and scattering to the transport problem fail in $H^{s}, s>-1$. We further show that this behavior is consistent with the nonlinear Euler equations and that a similar result also holds for the nonlinear Navier-Stokes equations. Hence, these results provide an indication that nonli…
In this paper, we study stationary structures near the planar Couette flow in Sobolev spaces on a channel $\mathbb{T}\times[-1,1]$, and asymptotic behavior of Couette flow in Gevrey spaces on $\mathbb{T}\times\mathbb{R}$ for the $β$-plane equation. Let $T>0$ be the horizontal period of the channel and $α={2π\over T}$ be the wave number. We obtain a sharp region $O$ in the whole $(α,β)$ half-plane such that non-parallel steadily traveling waves do not exist for $(α,β)\in O$ and such traveling waves exist for $(α,β)$ in the remaining regions, near Couette flow for $H^{\geq5}$ velocity perturbati…
Asymptotic expansions with subordinate variables for solutions of the Navier-Stokes equations
针对时间衰减外力下三维Navier-Stokes方程因外力复杂导致原有渐近展开理论失效的问题，提出含可递归从属变量的新渐近展开理论，借助算子与空间复化显式构造出任意Leray-Hopf弱解的渐近展开并明确从属变量的影响。
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