Hui Chen, Tai-Peng Tsai, Ting Zhang
In this note, a new local regularity criteria for the axisymmetric solutions to the 3D Navier--Stokes equations is investigated. It is slightly supercritical and implies an upper bound for the oscillation of $Γ=r u^θ$: for any $0< τ<1$, there exists a constant $c>0$, $$ |Γ(r,x_{3},t)|\leq N e^{-c\, |\ln r|^τ},\ 0<r\leq \frac{1}{4}. $$
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In this paper we prove a global well-posedness result for tridimensional Navier-Stokes-Boussinesq system with axisymmetric initial data. This system couples Navier-Stokes equations with a transport equation governing the density.
In the note, a local regularity condition for axisymmetric solutions to the non-stationary 3D Navier-Stokes equations is proven. It reads that axially symmetric energy solutions to the Navier-Stokes equations have no Type I blowups.
In the note, a new regularity condition for axisymmetric solutions to the non-stationary 3D Navier-Stokes equations is proven. It is slightly supercritical.
We study in this paper the axisymmetric 3-D Navier-Stokes system where the horizontal viscosity is zero. We prove the existence of a unique global solution to the system with initial data of Yudovitch type
In the paper, a new {\it slightly supercritical} condition, providing {\it local} regularity of axially symmetric solutions to the non-stationary 3D Navier-Stokes equations, is discussed. It generalises almost all known results in the local regularity theory of weak axisymmetric solutions.
In this paper we prove the global well-posedness for a three-dimensional Boussinesq system with axisymmetric initial data. This system couples the Navier-Stokes equation with a transport-diffusion equation governing the temperature. Our result holds uniformly with respect to the heat conductivity coefficient $κ\geq 0$ which may vanish.
We consider a family of 3D models for the axi-symmetric incompressible Navier-Stokes equations. The models are derived by changing the strength of the convection terms in the axisymmetric Navier-Stokes equations written using a set of transformed variables. We prove the global regularity of the family of models in the case that the strength of convection is slightly stronger than that of the original Navier-Stokes equations, which demonstrates the potential stabilizing effect of convection.
Liouville type of theorems play a key role in the blow-up approach to study the global regularity of the three-dimensional Navier-Stokes equations. In this paper, we will prove Liouville type of theorems to the 3-D axisymmetric Navier-Stokes equations with swirls under some suitable assumptions on swirl component velocity $u_θ$ which are scaling invariant. It is known that $ru_θ$ satisfies the maximum principle. The assumptions on $u_θ$ will be natural and useful to make further studies on the global regularity to the three-dimensional incompressible axisymmetric Navier-Stokes equations.
We study the asymptotic behavior of axisymmetric solutions with no swirl to the steady Navier-Stokes equations in the outside of the cylinder. We prove an a priori decay estimate of the vorticity under the assumption that the velocity has generalized finite Dirichlet integral. As an application, we obtain a Liouville-type theorem.
A note on potential Type II blowups of axisymmetric solutions to the Navier-Stokes equations
该注记研究Navier-Stokes方程轴对称解的潜在II型爆破情景，以Euler尺度变换为主要工具展开分析。
We point out some criteria that imply regularity of axisymmetric solutions to Navier-Stokes equations. We show that boundedness of $\|{v_{r}}/{\sqrt{r^3}}\|_{L_2({\rm R}^3\times (0,T))}$ as well as boundedness of $\|{ω_φ}/{\sqrt{r}}\|_{L_2({\rm R}^3\times (0,T))},$ where $v_r$ is the radial component of velocity and $ω_φ$ is the angular component of vorticity, imply regularity of weak solutions.
Fine large-time asymptotics for the axisymmetric Navier--Stokes equations
该研究针对三维无旋轴对称Navier--Stokes方程解的大时间行为问题，采用标准基于$L^2$的熵方法，构造出对应涡量的高阶渐近展开，技术路径简洁。
Axisymmetric weak solutions to stationary compressible Navier-Stokes equations with critical indices
本文研究全局空间和圆柱区域上等温稳态可压缩Navier-Stokes方程的轴对称弱解，利用方程抵消结构的新观察克服热比1和Sobolev临界指标两个临界指数带来的困难。
Global Existence and Incompressible Limit for the Three-Dimensional Axisymmetric Compressible Navier-Stokes Equations with Large Bulk Viscosity and Large Initial Data
针对不含轴圆柱域内带滑移边界条件的三维轴对称可压缩Navier-Stokes方程，在大体积粘性系数假设下，证明大初值含真空的各类解整体存在、指数衰减，以及大体积粘性极限下收敛到非齐次不可压缩方程的解。
In this paper, we study the three-dimensional axisymmetric Navier-Stokes system with nonzero swirl. By establishing a new key inequality for the pair $(\frac{ω^{r}}{r},\frac{ω^θ}{r})$, we get several Prodi-Serrin type regularity criteria based on the angular velocity, $u^θ$. Moreover, we obtain the global well-posedness result if the initial angular velocity $u_{0}^θ$ is appropriate small in the critical space $L^{3}(\R^{3})$. Furthermore, we also get several Prodi-Serrin type regularity criteria based on one component of the solutions, say $ω^3$ or $u^3$.
Global axisymmetric solutions for Navier-Stokes equation with rotation uniformly in the inviscid limit
本文证明带常值旋转的三维Navier-Stokes方程在小轴对称初值下全局适定，且小性条件对任意粘性一致，从而将Euler方程的旋转全局轴对称稳定性推广到粘性情形。
We consider a family of weights which permit to generalize the Leray procedure to obtain weak suitable solutions of the 3D incom-pressible Navier-Stokes equations with initial data in weighted L 2 spaces. Our principal result concerns the existence of regular global solutions when the initial velocity is an axisymmetric vector field without swirl such that both the initial velocity and its vorticity belong to L 2 ((1 + r 2) -- $γ$ 2 dx), with r = x 2 1 + x 2 2 and $γ$ $\in$ (0, 2).
We classify all (-1)-homogeneous axisymmetric no-swirl solutions of incompressible stationary Navier-Stokes equations in three dimension which are smooth on the unit sphere minus the south and north poles, parameterizing them as a four dimensional surface with boundary in appropriate function spaces. Then we establish smoothness properties of the solution surface in the four parameters. The smoothness properties will be used in a subsequent paper where we study the existence of (-1)-homogeneous axisymmetric solutions with non-zero swirl on $\mathbb{S}^2\setminus\{S,N\}$, emanating from the fou…
By applying the delicate \textit{a priori} estimates for the equations of $(Φ,Γ)$, which is introduced in the previous work, we obtain some multi-scale regularity criteria of the swirl component $u^θ$ for the 3D axisymmetric Navier-Stokes equations. In particularly, the solution $\mathbf{u}$ can be continued beyond the time $T$, provided that $u^θ$ satiesfies $$ u^θ \in L^{p}_{T}L^{q_{v}}_{v}L^{q_{h},w}_{h},~~\frac{2}{p}+\frac{1}{q_{v}}+\frac{2}{q_{h}}\leq 1, ~2<q_{h}\leq\infty,~\frac{1}{q_{v}}+\frac{2}{q_{h}}<1. $$
Long-time asymptotics of $3$-D axisymmetric Navier-Stokes equations in critical spaces
该研究针对临界空间中3维轴对称Navier-Stokes方程，无需预先小性条件证明其全局解最终为小解，得到两个相关范数的零极限，并借此改进轴对称解的衰减估计。
In this paper, we investigate the global regularity to 3-D inhomogeneous incompressible Navier-Stokes system with axisymmetric initial data which does not have swirl component for the initial velocity. We first prove that the $L^\infty$ norm to the quotient of the inhomogeneity by $r,$ namely $a/r\eqdefa\bigl(1/\r-1\bigr)\bigl/r,$ controls the regularity of the solutions. Then we prove the global regularity of such solutions provided that the $L^\infty$ norm of $a_0/r$ is sufficiently small. Finally, with additional assumption that the initial velocity belongs to $L^p$ for some $p\in [1,2),$ w…
Axisymmetric flows with swirl for Euler and Navier-Stokes equations
本文研究轴对称 Euler 和 Navier-Stokes 方程的定常自相似解，证明无滑移间断解的不存在性，并证明 Navier-Stokes 解在零粘性极限下收敛到 Euler 解。
Consider axisymmetric strong solutions of the incompressible Navier-Stokes equations in $\R^3$ with non-trivial swirl. Let $z$ denote the axis of symmetry and $r$ measure the distance to the z-axis. Suppose the solution satisfies either $|v (x,t)| \le C_*{|t|^{-1/2}} $ or, for some $\e > 0$, $|v (x,t)| \le C_* r^{-1+ε} |t|^{-ε/2}$ for $-T_0\le t < 0$ and $0<C_*<\infty$ allowed to be large. We prove that $v$ is regular at time zero.
Axisymmetric steady Navier-Stokes flows under suction
本文证明了无穷圆柱体周围轴对称定常Navier-Stokes系统在外力作用下解的存在性，通过在抽吸流附近对非线性系统进行扰动分析，克服了线性化系统的Stokes悖论，构造了水平无穷远处衰减的解。
This paper is devoted to the study of the Cauchy problem for the stratified Navier-Stokes system in space dimension three. In the first part of the paper, we prove the existence of a unique global solution $(v_ν,ρ_ν)$ for this system with axisymmetric initial data belonging to the Sobolev spaces $H^{s}\times H^{s-2}$ with $s>5/2.$ The bounds of the solution are uniform with respect to the viscosity. In the second part, we analyse the inviscid limit problem. We prove the strong convergence in the space $L^{\infty}_{\text{loc}}(\RR_+; H^{s}\times H^{s-2})$ of the viscous solutions $(v_ν,ρ_ν)_{ν>…
Consider axisymmetric strong solutions of the incompressible Navier-Stokes equations in $\R^3$ with non-trivial swirl. Such solutions are not known to be globally defined, but it is shown in \cite{MR673830} that they could only blow up on the axis of symmetry. Let $z$ denote the axis of symmetry and $r$ measure the distance to the z-axis. Suppose the solution satisfies the pointwise scale invariant bound $|v (x,t)| \le C_*{(r^2 -t)^{-1/2}} $ for $-T_0\le t < 0$ and $0<C_*<\infty$ allowed to be large, we then prove that $v$ is regular at time zero.
In this paper, we investigate the global well-posedness for the 3-D inhomogeneous incompressible Navier-Stokes system with the axisymmetric initial data. We prove the global well-posedness provided that $$\|\frac{a_{0}}{r}\|_{\infty} \textrm{ and } \|u_{0}^θ\|_{3} \textrm{ are sufficiently small}. $$ Furthermore, if $\mathbf{u}_0\in L^1$ and $ru^θ_0\in L^1\cap L^2$, we have \begin{equation*} \|u^θ(t)\|_{2}^{2}+\langle t\rangle \|\nabla (u^θ\mathbf{e}_θ)(t)\|_{2}^{2}+t\langle t\rangle(\|u_{t}^θ(t)\|_{2}^{2}+\|Δ(u^θ\mathbf{e}_θ)(t)\|_{2}^{2}) \leq C \langle t\rangle^{-\frac{5}{2}},\ \forall\ t>0…
In this paper, we investigate the decay properties of an axisymmetric D-solutions to stationary incompressible Navier-Stokes systems in $\mathbb{R}^3$. We obtain the optimal decay rate $|{\bf u}(x)|\leq \frac{C}{|x|+1}$ for axisymmetric flows without swirl. Furthermore, we find a dichotomy for the decay rates of the swirl component $u_θ$, that is, either $O(\frac{1}{r+1})\leq |u_θ(r,z)|\leq \frac{C\log(r+1)}{(r+1)^{1/2}}$ or $|u_θ(r,z)|\leq \frac{C r}{(ρ+1)^3}$, where $ρ=\sqrt{r^2+z^2}$. In the latter case, we can further deduce that the other two components of the velocity field also attain t…
Motivated by applications to vortex rings, we study the Cauchy problem for the three-dimensional axisymmetric Navier-Stokes equations without swirl, using scale invariant function spaces. If the axisymmetric vorticity is integrable with respect to the two-dimensional measure dr dz, where (r,θ,z) denote the cylindrical coordinates in R^3, we show the existence of a unique global solution, which converges to zero in L^1 norm as time goes to infinity. The proof of local well-posedness follows exactly the same lines as in the two-dimensional case, and our approach emphasizes the similarity between…
$(-1)$-homogeneous axisymmetric no-swirl solutions of three dimensional incompressible stationary Navier-Stokes equations which are smooth on the unit sphere minus the north and south poles have been classified, %as a four parameter family for each viscosity. In this paper we study the vanishing viscosity limit of sequences of these solutions. As the viscosity tends to zero, some sequences of solutions $C^m_{loc}$ converge to solutions of Euler equations on the sphere minus the poles, while for other sequences of solutions, transition layer behaviors occur. For every latitude circle, there are…
Quantitative control of solutions to the axisymmetric Navier-Stokes equations in terms of the weak $L^3$ norm
该研究针对三维不可压缩Navier-Stokes方程的强轴对称解，建立了基于弱$L^3$范数界的各阶空间导数的定量估计，给出了解的正则性的定量控制结果。
Liouville-type theorems for Axisymmetric solutions to steady Navier-Stokes system in a layer domain
本文针对层状区域中稳态 Navier–Stokes 系统的轴对称解，在无滑移与 Navier 边界条件下，借助 Saint-Venant 型 Dirichlet 积分增长估计，证明了有界解和 D-解在出口宽度增长受限时的 Liouville 型平凡性结论。
Global Strong Solutions to the Three-Dimensional Axisymmetric Compressible Navier-Stokes Equations with Large Initial Data and Vacuum
本文在圆柱区域滑移边界条件下，对允许真空的三维轴对称可压缩Navier-Stokes方程，利用轴对称性、共形映射和Green函数推导有效粘性通量逐点估计，从而在无初值大小限制下证明了大初值强解与弱解的全局存在性及长时间渐近行为。
In this paper, the existence and uniqueness of strong axisymmetric solutions with large flux for the steady Navier-Stokes system in a pipe are established even when the external force is also suitably large in $L^2$. Furthermore, the exponential convergence rate at far fields for the arbitrary steady solutions with finite $H^2$ distance to the Hagen-Poiseuille flows is established as long as the external forces converge exponentially at far fields. The key point to get the existence of these large solutions is the refined estimate for the derivatives in the axial direction of the stream functi…
Asymptotic behavior and Liouville-type theorems for axisymmetric stationary Navier-Stokes equations outside of an infinite cylinder with a periodic boundary condition
本文研究无限长圆柱外无旋、轴向周期的定常 Navier-Stokes 流，在广义有限 Dirichlet 积分条件下建立涡量逐点衰减估计，并证明 Liouville 型定理。
Global axisymmetric solutions and incompressible limit for the 3D isentropic compressible Navier-Stokes equations in annular cylinders with swirl and large initial data
研究在环形柱体中建立弱解的存在性，考虑大轴对称初值和真空状态，通过大本体粘度抑制压缩效应，推动不可压缩极限理论发展。
Classification of local $(-1)$-homogeneous axisymmetric solutions of the $3$D stationary Navier-Stokes equations with logarithmic singular-ray behavior
该研究分类三维定常Navier-Stokes方程的局部(-1)次齐次轴对称解，构造含非零旋度II型解的四参数族，明确其特性并确定跨奇异射线的奇异力。
In this paper, we establish several new anisotropic Hardy-Sobolev inequalities in mixed Lebesgue spaces and mixed Lorentz spaces, which covers many known corresponding results. As an application, this type of inequalities allows us to generalize some regularity criteria of the 3D axisymmetric Navier-Stokes equations.
All $(-1)$-homogeneous axisymmetric no-swirl solutions of incompressible stationary Navier-Stokes equations in three dimension which are smooth on the unit sphere minus north and south poles have been classified in our earlier work as a four dimensional surface with boundary. In this paper, we establish near the no-swirl solution surface existence, non-existence and uniqueness results on $(-1)$-homogeneous axisymmetric solutions with nonzero swirl which are smooth on the unit sphere minus north and south poles.
On the existence and structures of almost axisymmetric solutions to 3-D Navier-Stokes equations
本文研究三维Navier-Stokes方程的几乎轴对称解，证明了小旋流初始数据下全局唯一强解的存在性与接近轴对称的性质，分析了特殊初始数据解的渐近展开与持久对称结构，揭示了方程非线性项的特征。
We classify all $(-1)-$homogeneous axisymmetric no swirl solutions of incompressible stationary Navier-Stokes equations in three dimension which are smooth on the unit sphere minus the south pole, parameterize them as a two dimensional surface with boundary, and analyze their pressure profiles near the north pole. Then we prove that there is a curve of $(-1)-$homogeneous axisymmetric solutions with nonzero swirl, having the same smoothness property, emanating from every point of the interior and one part of the boundary of the solution surface. Moreover we prove that there is no such curve of …
We investigate the large time behavior of an axisymmetric model for the 3D Euler equations. In \cite{HL09}, Hou and Lei proposed a 3D model for the axisymmetric incompressible Euler and Navier-Stokes equations with swirl. This model shares many properties of the 3D incompressible Euler and Navier-Stokes equations. The main difference between the 3D model of Hou and Lei and the reformulated 3D Euler and Navier-Stokes equations is that the convection term is neglected in the 3D model. In \cite{HSW09}, the authors proved that the 3D inviscid model can develop a finite time singularity starting fr…
A regularity criterion for the angular component of velocity in the norm $L_\infty(0,T;L_p(Ω)),\;\frac 3 p <1$ in axisymmetric Navier Stokes equations in a cylinder
针对有限圆柱中的轴对称Navier-Stokes方程，通过对修正流函数用$H^3$索伯列夫估计、对旋度梯度用能量型估计得降阶估计，结合$v_φ$的$L_\infty(0,T;L_p)$范数条件（$p>3$），证明全局正则轴对称解存在。
Landau solutions are special solutions to the stationary incompressible Navier-Stokes equations in the three dimensional space excluding the origin. They are self-similar and axisymmetric with no swirl. In fact, any self-similar smooth solution must be a Landau solution. In the effort of extending this result to the one for the solution class with the pointwise scale-invariant bound $|u(x)|\leq C_0|x|^{-1}$ for some $C_0>0$, we consider axisymmetric discretely self-similar solutions, and investigate the existence of such solution curve emanating from some Landau solution. We prove that the inc…
New decay estimates and Liouville type theorems for the 3D axisymmetric stationary Navier-Stokes equations
本文针对三维轴对称定常Navier-Stokes方程，改进了衰减估计与Liouville型定理，放宽轴对称准则，在无对称假设下得到D-解平凡的判定条件。
Regularity of asymptotically axisymmetric solutions to the 3D Navier-Stokes equations with analytic forcing
本文证明在实解析外力下，满足特定各向异性Type II界且核心区域严格轴对称的三维Navier-Stokes方程解在假想奇点处正则，并由此推出外力在奇点附近不能恒为零或实解析。
It is known that the three dimensional Navier-Stokes system for an incompressible fluid in the whole space has a one parameter family of explicit stationary solutions, which are axisymmetric and homogeneous of degree -1. We show that these solutions are asymptotically stable under any $L^2$-perturbation.
Regularity for axisymmetric Navier-Stokes with an Euler length
本文证明三维轴对称Navier-Stokes方程在Euler长度尺度下的Type II逐点界蕴含局部正则性，通过环量和位势涡度论证改编至古老极限，并以Hölder界替代二阶导数假设。
In this paper, we consider the 3D Navier-Stokes equations in the whole space. We investigate some new inequalities and \textit{a priori} estimates to provide the critical regularity criteria in terms of one directional derivative of the velocity field, namely $\partial_3 \mathbf{u} \in L^p((0,T); L^q(\mathbb{R}^3)), ~\frac{2}{p} + \frac{3}{q} = 2, ~\frac{3}{2}<q\leq 6$. Moreover, we extend the range of $q$ while the solution is axisymmetric, i.e. the axisymmetric solution $\mathbf{m}{u}$ is regular in $(0,T]$, if $ \partial_3 u^3 \in L^p((0,T); L^q(\mathbb{R}^3)), ~\frac{2}{p} + \frac{3}{q} = …
Critical Structure of Axisymmetric Navier--Stokes with Swirl
通过引入循环Γ、提升涡度比G和轴相容梯度对Ξ，利用近轴Hardy公式和轴向一维Sobolev估计，证明了任意旋流的三维不可压Navier-Stokes方程光滑有限能量轴对称解的整体光滑性。
We study the vanishing viscosity limit for the three-dimensional incompressible Navier-Stokes equations in terms of the relative vorticity in the setting of axisymmetric velocity fields without swirl. We show that the weak convergence of relative vorticity to a renormalized solution of the Euler equations, established by Nobili and Seis, can be upgraded to strong convergence.
Nearly self-similar blowup of generalized axisymmetric Navier-Stokes equations
本文数值研究了广义轴对称 Navier-Stokes 方程的近自相似爆破，通过引入维度作为额外自由度开发双尺度动态重缩放公式，并证明了解依赖粘性下的单尺度自相似爆破及重缩放模型的爆破行为。
Global Regularity of Axisymmetric Navier-Stokes Equations with NHL Boundary Conditions under a Critical Smallness Condition
本文研究了在有限圆柱体内轴对称不可压缩纳维-斯托克斯方程在NHL边界条件下的全局正则性问题，证明了在初始数据满足特定小性条件时，解在所有时间内保持正则。
We prove Wolf's regularity condition up to the boundary for solutions to the Navier-Stokes equations satisfying non-slip boundary condition.
We extend Barker's weak-strong uniqueness results for the Navier--Stokes equations and consider a criterion involving Besov spaces and weighted Lebesgue spaces.
Endpoint Architectures for Navier--Stokes
本文通过两阶段第一阈值论证，证明Navier-Stokes方程光滑有限能量解的全局平滑延续性，利用轴对称涡旋闭合和全系统约简方法，结合能量恒等式、插值估计等技术，排除非平滑解的可能性。
This work concerns the global well-posedness problem for the 3D axisymmetric viscous Boussinesq system with critical rough initial data. More precisely, we aim to extending our recent result \cite{Hanachi-Houamed-Zerguine} to the case of initial data of measure type. To this end, we should first develop some notions of axisymmetric measures in a general context, then, in the spirit of \cite{Gallay-Sverak}, we prove the global wellposedness result provided that the atomic parts of the initial measures are small enough.
In this note, we investigate the 3D steady axially symmetric Navier-Stokes equations, and obtained Liouville type theorems if the velocity or the vorticity satisfies some a priori decay assumptions.
Recent research on $(-1)$-homogeneous solutions of stationary Navier-Stokes equations
本文综述了三维不可压缩平稳Navier-Stokes方程$(-1)$-齐次解的最新进展，探讨了无旋轴对称解的性质，并图示了典型奇异行为。
Liouville type theorems for the stationary Navier-Stokes equations are proven under certain assumptions. These assumptions are motivated by conditions that appear in Liouvile type theorems for the heat equations with a given divergence free drift.
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