V. A. Galaktionov
A second-order PDE is derived from Euler's equaitons under certain assumptions. It is shown that this PDE admits shock and rarefaction waves, and that a single point gradient blow-up admits a unique similarity extension after blow-up that settles uniqueness/entropy issues for such equations.
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Various shock and rarefaction-type similarity solutions of the third-order nonlinear dispersion equation in 1D are constructed. Blow-up of some solutions are proved by different techniques.
This paper construct a family of explicit self-similar blowup axisymmetric solutions for the 3D incompressible Euler equations in R^3. Those singular solutions admit infinite energy.
We consider a parabolic-type PDE with a diffusion given by a fractional Laplacian operator and with a quadratic nonlinearity of the 'gradient' of the solution, convoluted with a singular term b. Our first result is the well-posedness for this problem: We show existence and uniqueness of a (local in time) mild solution. The main result is about blow-up of said solution, and in particular we find sufficient conditions on the initial datum and on the term b to ensure blow-up of the solution in finite time.
We prove a localized non blow-up theorem of the Beale-Kato-Majda type for the solution of the 3D incompressible Euler equations.
We exclude Type I blow-up, which occurs in the form of atomic concentrations of the $L^2$ norm for the solution of the 3D incompressible Euler equations. As a corollary we prove nonexistence of discretely self-similar blow-up in the energy conserving scale.
We partially answer a question raised by Kiselev and Zlatos in \cite{MR2180809}; in the generalized dyadic model of the Euler equation, a blow-up of $H^{1/3+δ}$-norm occurs. We recover a few previous blow-up results for various related dyadic models as corollaries.
In this paper we prove that for a certain class of initial data, smooth solutions of the hydrostatic Euler equations blow up in finite time.
We study behaviors of scalar quantities near the possible blow-up time, which is made of smooth solutions of the Euler equations, Navier-Stokes equations and the surface quasi-geostrophic equations. Integrating the dynamical equations of the scaling invariant norms, we derive the possible blow-up behaviors of the above quantities, from which we obtain new type of blow-up criteria and some necessary conditions for the blow-up.
In this work, we study the behavior of blow-up solutions to the multidimensional restricted Euler--Poisson equations which are the localized version of the full Euler--Poisson system. We provide necessary conditions for the existence of finite-time blow-up solutions in terms of the initial data, and describe the asymptotic behavior of the solutions near blow up times. We also identify a rich set of the initial data which yields global bounded solutions.
In this paper, the finite time blow-up of smooth solutions to the Cauchy problem for full Euler-Poisson equations and isentropic Euler-Poisson equations with repulsive forces or attractive forces in high dimensions $(n\geq3)$ is proved for a large class of initial data. It is not required that the initial data has compact support or contains vacuum in any finite regions.
We prove the finite time blow-up for $C^1$ solutions to the Euler-Poisson equations in $\Bbb R^n$, $n\geq 1$, with/without background density for initial data satisfying suitable conditions. We also find a sufficient condition for the initial data such that $C^3$ solution breaks down in finite time for the compressible Euler equations for polytropic gas flows.
We give a vorticity-dynamical proof of $C^1\cap H^2$-illposedness of the 2D Euler equations. Our construction shows that the unique Yudovich solution escapes both $C^1$ and $H^2$ instantaneously.
We find a smooth solution of the 2D Euler equation on a bounded domain which exists and is unique in a natural class locally in time, but blows up in finite time in the sense of its vorticity losing continuity. The domain's boundary is smooth except at two points, which are interior cusps.
We improve the recent result of Chae & Tadmor in [Comm. Math. Sci. 6(3) (2008) 785-789], proving a one-sided threshold condition which leads to finite-time breakdown of the Euler-Poisson equations in arbitrary dimension n.
We study the interaction between the stability, and the propagation of regularity, for solutions to the incompressible 3D Euler equation. It is still unknown whether a solution with smooth initial data can develop a singularity in finite time. This article explains why the prediction of such a blow-up, via direct numerical experiments, is so difficult. It is described how, in such a scenario, the solution becomes unstable as time approaches the blow-up time.
The paper has been withdrawn by the author due to a gap in Proof of Theorem 1.1.
We study the impact of the convective terms on the global solvability or finite time blow up of solutions of dissipative PDEs. We consider the model examples of 1D Burger's type equations, convective Cahn-Hilliard equation, generalized Kuramoto-Sivashinsky equation and KdV type equations, we establish the following common scenario: adding sufficiently strong (in comparison with the destabilizing nonlinearity) convective terms to equation prevents the solutions from blowing up in finite time and makes the considered system globally well-posed and dissipative and for weak enough convective terms…
In this paper we mainly investigate the initial value problem of the periodic Euler-Poincaré equations. We first present a new blow-up result to the system for a special class of smooth initial data by using the rotational invariant properties of the system. Then, we prove that the periodic Euler-Poincaré equations is ill-posed in critical Besov spaces by a contradiction argument. Finally, we verify the system possesses a class of peakon solutions in the sense of distributions.
In this paper we derive kinematic relations for quantities involving the rate of strain tensor and the Hessian of the pressure for solutions of the 3D Euler equations and the 2D Boussinesq equations. Using these kinematic relations, we prove new blow up criteria and obtain conditions for the absence of type I singularity for these equations. We obtain both global and localized versions of the results. Some of the new blow up criteria and type I conditions improve previous results of [3].
We study blow-up rates and the blow-up profiles of possible asymptotically self-similar singularities of the 3D Euler equations, where the sense of convergence and self-similarity are considered in various sense. We extend much further, in particular, the previous nonexistence results of self-similar/asymptotically self-similar singularities obtained in \cite{cha1,cha2}. Some implications the notions for the 3D Navier-Stokes equations are also deduced. Generalization of the self-similar transforms is also considered, and by appropriate choice of the transform we obtain new \textit{a priori} es…
In this paper we study the finite time blow-up problem for the axisymmetric 3D incompressible Euler equations with swirl. The evolution equations for the deformation tensor and the vorticity are reduced considerably in this case. Under the assumption of local minima for the pressure on the axis of symmetry with respect to the radial variations we show that the solution blows-up in finite time. If we further assume that the second radial derivative vanishes on the axis, then system reduces to the form of Constantin-Lax-Majda equations, and can be integrated explicitly.
In connection with the recent proposal for possible singularity formation at the boundary for solutions of 3d axi-symmetric incompressible Euler's equations (Luo and Hou, 2013), we study models for the dynamics at the boundary and show that they exhibit a finite-time blow-up from smooth data.
Finite-time blowup of the Euler equation without forcing
本文构造了三维不可压缩无外力欧拉方程的有限时间爆破解，通过逐层添加振荡层并确保每层满足方程，实现了爆破现象。
In this note we study locally self-similar blow up for the Euler equation. The main result states that under a mild $L^p$-growth assumption on the profile $v$, namely, $\int_{|y| \sim L} |v|^p dy \lesssim L^{\g}$ for some $\g <p-2$, the self-similar solution carries a positive amount of energy up to the time of blow-up $T$, namely, $\int_{|y| \sim L} |v|^2 dy \sim L^{N-2\a}$. The result implies and extends several previously known exclusion criteria. It also supports a general conjecture relating fractal local dimensions of the energy measure with the rate of velocity growth at the time of pos…
Instability for Axisymmetric Blow-up Solutions to Incompressible Euler Equations
本文证明不可压缩欧拉方程若存在有限时间爆破，其解在轴对称情形下同样会在爆破时刻附近线性不稳定，并建立了仅依赖涡量环向分量的爆破准则。
Singularity formation of the 3D incompressible Euler equations is known to be extremely challenging. In [18], Elgindi proved that the 3D axisymmetric Euler equations with no swirl and $C^{1,α}$ initial velocity develops a finite time singularity. Inspired by Elgindi's work, we proved that the 3D axisymmetric Euler and 2D Boussinesq equations with $C^{1,α}$ initial velocity and boundary develop a stable asymptotically (or approximately) self-similar finite time singularity [8]. On the other hand, the authors of [35,52] recently showed that blowup solutions to the 3D Euler equations are hydrodyn…
Multi-scale self-similar finite-time blowups of the Constantin-Lax-Majda model for the 3D Euler equations
本文为1D Constantin-Lax-Majda模型构造了一类具有两个坍缩空间尺度的新渐近自相似有限时间爆破，以揭示高维方程中多尺度爆破的共同机制。
Global existence and blow-up for the Euler-Poincaré equations with a class of initial data
本文通过构造特殊初值将 d 维 Euler-Poincaré 方程化为 Camassa-Holm 型方程，进而获得全局存在性结果并给出新的爆破条件。
On the blowup rate of vorticity for the Euler equations in a bounded domain
研究欧拉方程在有界域中首次爆破时间的涡量导数下界，并展示在不同域中涡量的Gronwall不等式解呈现剧烈震荡。
Gradient blowup of smooth vacuum solutions to 1D compressible Euler equations
研究1D可压缩欧拉方程在半轴上的解，发现初始光滑且平方可积的解在有限时间内过渡到边界处C^{1-μ}正则性，导致边界处梯度爆炸。
The question of the global regularity vs finite time blow up in solutions of the 3D incompressible Euler equation is a major open problem of modern applied analysis. In this paper, we study a class of one-dimensional models of the axisymmetric hyperbolic boundary blow up scenario for the 3D Euler equation proposed by Hou and Luo based on extensive numerical simulations. These models generalize the 1D Hou-Luo model suggested in Hou & Luo's paper, for which finite time blow up has been established in the paper by Kyudong Choi, Thomas Y. Hou, Alexander Kiselev, Guo Luo, Vladimir Sverak, Yao Yao. …
We study scenarios of self-similar type blow-up for the incompressible Navier-Stokes and the Euler equations. The previous notions of the discretely (backward) self-similar solution and the asymptotically self-similar solution are generalized to the locally asymptotically discretely self-similar solution. We prove that there exists no such locally asymptotically discretely self-similar blow-up for the 3D Navier-Stokes equations if the blow-up profile is a time periodic function belonging to $C^1(\Bbb R ; L^3(\Bbb R^3)\cap C^2 (\Bbb R^3))$. For the 3D Euler equations we show that the scenario o…
We study a 1D model for the 3D incompressible Euler equations in axisymmetric geometries, which can be viewed as a local approximation to the Euler equations near the solid boundary of a cylindrical domain. We prove the local well-posedness of the model in spaces of zero-mean functions, and study the potential formation of a finite-time singularity under certain convexity conditions for the velocity field. It is hoped that the results obtained on the 1D model will be useful in the analysis of the full 3D problem, whose loss of regularity in finite time has been observed in a recent numerical s…
A blow-up result for the semilinear Euler-Poisson-Darboux-Tricomi equation with critical power nonlinearity
本文针对具有多项式增长传播速度的广义半线性Euler-Poisson-Darboux方程，在临界幂情形下证明了爆破结果，并给出了与经典半线性波动方程一致的生命跨度上界估计。
Emergence of peaked singularities in the Euler-Poisson system
该研究针对带玻尔兹曼关系的一维Euler-Poisson系统，推导了尖峰孤立波的渐近行为与冷离子极限的Hölder指数范围，还通过数值验证发现了不同于Burgers型爆破的C¹爆破解形式。
Vorticity blow-up for the 2D incompressible non-homogeneous Euler equations with uniform $C^{1,\sqrt{\frac{4}{3}}-1-\varepsilon}$ force
通过将Boussinesq爆破方法适应到非齐次欧拉方程，证明了在有限时间内产生奇异性的解的存在性，并揭示了强迫系统中两种不同类型奇异性的潜在存在。
We consider a partial differential equation that arises in the coarse-grained description of epitaxial growth processes. This is a parabolic equation whose evolution is governed by the competition between the determinant of the Hessian matrix of the solution and the biharmonic operator. This model might present a gradient flow structure depending on the boundary conditions. We first extend previous results on the existence of stationary solutions to this model for Dirichlet boundary conditions. For the evolution problem we prove local existence of solutions for arbitrary data and global existe…
Blow-up of solutions to the Euler-Poisson-Darbox equation with critical power nonlinearity
本文研究了Euler-Poisson-Darboux方程在临界非线性幂次下的有限时间爆破问题，通过改进的测试函数方法，得到了非线性项时空积分的下界，从而获得了对应初值问题的爆破结果和寿命上界估计。
Lower bounds on the blowup rate of vorticity in the Euler equations
本文研究了欧拉方程中涡量爆炸速率的下界，通过分析在三维不可压缩流体中，当解在时间T*处爆炸时，给出了最大涡量范数爆炸速率的下界，并探讨了BKM爆炸准则的定量描述及变形张量导数的爆炸速率后果。
Geometric blow-up criteria for the non-homogeneous incompressible Euler equations in 2-D
针对二维变密度不可压缩欧拉方程整体适定性未知的问题，提出仅需控制∇u沿X=∇⊥ρ方向分量的几何爆破准则，覆盖亚临界与临界正则性框架，且能恢复常密度情况的整体适定性。
Delta-shock for the pressureless Euler-Poisson system
本文针对无压欧拉-泊松系统，构造性地证明了delta激波奇异性形成，给出了密度和速度在爆破点附近的精确渐近轮廓，并推广至无压欧拉方程。
In this paper we study the Euler-Poincaré equations in $\Bbb R^N$. We prove local existence of weak solutions in $W^{2,p}(\Bbb R^N),$ $p>N$, and local existence of unique classical solutions in $H^k (\Bbb R^N)$, $k>N/2+3$, as well as a blow-up criterion. For the zero dispersion equation($α=0$) we prove a finite time blow-up of the classical solution. We also prove that as the dispersion parameter vanishes, the weak solution converges to a solution of the zero dispersion equation with sharp rate as $α\to0$, provided that the limiting solution belongs to $C([0, T);H^k(\Bbb R^N))$ with $k>N/2 +3$…
Structure of singularities for the Euler-Poisson system of ion dynamics
本文通过自相似变量中 Burgers 方程的稳定爆破剖面，构造性地证明了等温 Euler-Poisson 系统从光滑初值形成尖点型奇异性，并给出爆破时刻的正则性刻画及等熵情形的对应结果。
It is shown that, for the bi-harmonic equation, an optimal regularity criterion of the vertex of typical paraboloids can be expressed in terms of Osgood-Dini integral conditions of Petrovskii's type for the heat equation derived in 1934. Some extensions of the first Fourier coefficent method to other PDEs are discussed. A survey on boundary point regularity for elliptic and parabolic PDEs is enclosed.
Inspired by the numerical evidence of a potential 3D Euler singularity \cite{luo2014potentially,luo2013potentially-2}, we prove finite time singularity from smooth initial data for the HL model introduced by Hou-Luo in \cite{luo2014potentially,luo2013potentially-2} for the 3D Euler equations with boundary. Our finite time blowup solution for the HL model and the singular solution considered in \cite{luo2014potentially,luo2013potentially-2} share some essential features, including similar blowup exponents, symmetry properties of the solution, and the sign of the solution. We use a dynamical res…
Dimension reduction of axially symmetric Euler equations near maximal points off the axis
该论文证明轴对称欧拉方程在轴外极大点附近的爆破极限可约化为二维欧拉方程，从而简化了轴外自相似解的搜索，并指出构造半平面稳定古代解可能为速度爆破提供途径。
The question of spontaneous apparition of singularity in the 3D incompressible Euler equations is one of the most important and challenging open problems in mathematical fluid mechanics. In this survey article we review some of recent approaches to the problem. We first review Kato's classical local well-posedness result in the Sobolev space and derive the celebrated Beale-Kato-Majda criterion for finite time blow-up. Then, we discuss recent refinements of the criterion as well as geometric type of theorems on the sufficiency condition for the regularity of solutions. After that we review resu…
Liouville comparison theory for blowup of Euler-Arnold equations
该研究提出无穷维函数空间中基于Liouville方程比较的Euler-Arnold方程爆破新准则，证明了三维及以上高阶EPDiff方程在一维存在全局解的情形下仍会发生C^1爆破。
Vorticity blowup in 2D compressible Euler equations
该研究证明二维可压缩欧拉方程在光滑局部非真空初值下光滑解会发生有限时间涡量爆破，爆破伴随轴对称内爆且旋向速度具有完全稳定性。
Blow-up result for a weakly coupled system of two Euler-Poisson-Darboux-Tricomi equations with time derivative nonlinearity
本文研究具有尺度不变阻尼、时间导数非线性、质量项和Tricomi项的两个Euler-Poisson-Darboux-Tricomi方程弱耦合系统，在相同传播速度假设下得到新的爆破区域并给出最大存在时间的寿命估计。
In this paper, we are concerned with the global existence and blowup of smooth solutions of the 3-D compressible Euler equation with time-depending damping $$ \partial_tρ+\operatorname{div}(ρu)=0, \quad \partial_t(ρu)+\operatorname{div}\left(ρu\otimes u+p\,I_{3}\right)=-\,\fracμ{(1+t)^λ}\,ρu, \quad ρ(0,x)=\bar ρ+\varepsilonρ_0(x),\quad u(0,x)=\varepsilon u_0(x), $$ where $x\in\mathbb R^3$, $μ>0$, $λ\geq 0$, and $\barρ>0$ are constants, $ρ_0,\, u_0\in C_0^{\infty}(\mathbb R^3)$, $(ρ_0, u_0)\not\equiv 0$, $ρ(0,\cdot)>0$, and $\varepsilon>0$ is sufficiently small. For $0\leqλ\leq1$, we show that …
Finite-time blowup for the Fourier-restricted Euler and hypodissipative Navier-Stokes model equations
提出 Fourier 受限 Euler 与低耗散 Navier–Stokes 模型，证明无粘及弱耗散情形下离散对称解的有限时间爆破，并保留能量与拟涡能恒等式。
Asymptotically Self-Similar Blowup for 3D Incompressible Euler with $C^{1, 1/3-}$ Velocity II: 3D Profiles, Blowup, and Limiting behavior
本文研究了三维不可压缩欧拉方程中无旋流体的自相似破裂问题，通过构造精确的C^α自相似破裂轮廓，并证明了从C_c^α初始涡度和C^{1,α}∩L^2初始速度出发的渐近自相似破裂，同时揭示了当α趋近于1/3^-时涡度轮廓和破裂解的极限行为。
We investigate the role of convection on its large time behavior of 3D incompressible Euler equations. In \cite{HL09a}, we constructed a new 3D model by neglecting the convection term from the reformulated axisymmetric Navier-Stokes equations. This model preserves almost all the properties of the full Navier-Stokes equations, including an energy identity for smooth solutions. The numerical evidence presented in \cite{HL09a} seems to support that the 3D model may develop a finite time singularity. In this paper, we prove rigorously that the 3D inviscid model develops a finite time singularity f…
Blow-up for the incompressible 3D-Euler equations with uniform $C^{1,\frac{1}{2}-ε}\cap L^2$ force
本文提出了一种新方法，通过构造非轴对称解，在均匀外力作用下实现了 3D 不可压缩 Euler 方程的爆破，且不依赖自相似坐标。
In the language of differential geometry, the incompressible inviscid Euler equations can be written in vorticity-vector potential form as \begin{align*} \partial_t ω+ {\mathcal L}_u ω&= 0\\ u &= δ\tilde η^{-1} Δ^{-1} ω\end{align*} where $ω$ is the vorticity $2$-form, ${\mathcal L}_u$ denotes the Lie derivative with respect to the velocity field $u$, $Δ$ is the Hodge Laplacian, $δ$ is the codifferential (the negative of the divergence operator), and $\tilde η^{-1}$ is the canonical map from $2$-forms to $2$-vector fields induced by the Euclidean metric $η$. In this paper we consider a generali…
It is shown that third-order 1D nonlinear dispersion equations admit single point gradient catastrophe, described by blow-up-type similarity solutions. After blow-up, the solutions admit shock wave-type self-similar extensions. Snce such extensions are not unique, this implies the principle nonuniqueness of shock-type solutions and also nonexistence of any entropy-type description of proper unique solutions. A difficult free-boundary setting, with extra conditions specified on shocks, are necessary to restore uniqueness in such problems.
This article is the continued version of the analytical blowup solutions for 2-dimensional Euler-Poisson equations in "M.W. Yuen, Analytical Blowup Solutions to the 2-dimensional Isothermal Euler-Poisson Equations of Gaseous Stars, J. Math. Anal. Appl. 341 (1)(2008), 445-456." and "M.W. Yuen, Analytical Blowup Solutions to the 2-dimensional Isothermal Euler-Poisson Equations of Gaseous Stars II. arXiv:0906.0176v1". With the extension of the blowup solutions with radial symmetry for the isothermal Euler-Poisson equations in R^2, other special blowup solutions in R^N with non-radial symmetry are…
A note on certain scenarios of Type II blowups of suitable weak solutions to the Navier-Stokes equations
本文研究Navier-Stokes方程合适弱解的II型爆炸场景，证明在特定条件下此类爆炸不存在，从而得出正则性结果。
Investigating the Ability of PINNs To Solve Burgers' PDE Near Finite-Time BlowUp
本文从理论视角研究PINNs求解Burgers方程有限时间爆破的稳定性，推导任意维度下的泛化界，并通过实验证明该界与神经替代解到真实爆破解的ℓ₂距离显著相关。
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