V. A. Galaktionov, S. I. Pohozaev
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.
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Fifth-order 1D nonlinear dispersion equations are shown to admit blow-up formation of shock waves as well as rarefaction waves. The concepts of smooth deformations are applied to distinguish "entropy" shocks from smooth rarefaction waves. Single point gradient catastrophe is shown to lead to nonuniqueness after blow-up.
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.
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…
It is shown that fifth-order nonlinear dispersion equations from compacton theory admit shock and rarefaction waves. A self-similar gradient blow-up is shown to admit infinitely many similarity extensions beyond blow-up time, meaning principal nonuniqueness of solutions of the Cauchy problem after occurring such singularities.
Boundary Stabilization of Quasilinear Parabolic PDEs that Blow Up in Open Loop for Arbitrarily Small Initial Conditions
针对开环下任意小初始条件都会有限时间爆破的拟线性抛物型PDE，提出基于边界测量三次多项式的Neumann型边界控制框架，可处理非线性扩散等项，给出吸引域估计且其随扩散增大可无界扩张，支持多种边界条件，仿真验证了阻止爆破的有效性。
The paper studies the possible blowup of the total variation for entropy weak solutions of the p-system, modeling isentropic gas dynamics. It is assumed that the density remains uniformly positive, while the initial data can have arbitrarily large total variation (measured in terms of Riemann invariants). Two main results are proved. (I) If the total variation blows up in finite time, then the solution must contain an infinite number of large shocks in a neighborhood of some point in the $t$-$x$ plane. (II) Piecewise smooth approximate solutions can be constructed whose total variation blows u…
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.
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.
Some higher-order quasilinear parabolic, hyperbolic, and nonlinear dispersion equations are shown to admit various blow-up, extinction, and travelling wave solutions, which reduce to variational problems admitting countable families of compactly supported solutions.
Various formal blow-up scenarious for the Navier--Stokes equaitons in 3D are discussed. A particular interest is payed to "twistor mechanisms" based on angular logarithmic blow-up travelling waves, and to a formation of "blow-up tornado" about the singular stationary Slezkin--Landau solutions (1934--44) of a submerged jet. A survey on various related aspects of singularity analysis for nonlinear parabolic PDEs is enclosed.
We consider the large time behavior of strong solutions to a kind of stochastic Burgers equation, where the position x is perturbed by a Brownian noise. It is well known that both the rarefaction wave and viscous shock wave are time-asymptotically stable for deterministic Burgers equation since the pioneer work of A. Ilin and O. Oleinik [21] in 1964. However, the stability of these wave patterns under stochastic perturbation is not known until now. In this paper, we give a definite answer to the stability problem of the rarefaction and viscous shock waves for the 1-d stochastic Burgers equatio…
Vorticity interior trace estimates and higher derivative estimates via blow-up method
本研究针对三维不可压缩Navier-Stokes方程，运用爆破方法与新型平均算子推导了若干非线性先验迹估计，拓展了混合范数高阶导数估计的研究，相关方法可推广至具标度不变性、ε-正则性的偏微分方程。
Three classes of higher-order nonlinear parabolic hyperbolic, and nonlinear dispersion equations are shown to admit exact blow-up or compacton solutions, which are induced by elliptic equations with non-Lipschitz nonlinearities. Variational techniques give countable families of various compactly supported solutions with oscllatory behaviour cloase to the interfaces. Overall, the whole set of such compact patterns reveals certain chaotic properties and contains solutions of arbitrary complexity.
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。
In this paper we study the effect of the addition of a convective term, and of the resulting increased dissipation rate, on the growth of solutions to a general class of non-linear parabolic PDEs. In particular, we show that blow-up in these models can always be prevented if the added drift has a small enough dissipation time. We also prove a general result relating the dissipation time and the effective diffusivity of stationary cellular flows, which allows us to obtain examples of simple incompressible flows with arbitrarily small dissipation times. As an application, we show that blow-up in…
In this paper we present a weighted $L_p$-theory of second-order parabolic partial differential equations defined on $C^1$ domains. The leading coefficients are assumed to be measurable in time variable and have VMO (vanishing mean oscillation) or small BMO (bounded mean oscillation) with respect to space variables, and lower order coefficients are allowed to be unbounded and to blow up near the boundary. Our BMO condition is slightly relaxed than the others in the literature.
Schauder estimates for a class of fully nonlinear elliptic PDEs: a geometric tangential approach
本文通过爆破论证、几何切向分析与紧致性技术，为非凸非凹完全非线性椭圆PDE的经典解建立了局部与全局Schauder估计。
Soliton Resolution at Blow-Up for the Subconformal Nonlinear Wave Equation
本文在亚共形和共形情形下研究非线性波动方程的有限时间爆破，一维中完全解决孤子分解猜想，并推广到高维及扰动版本，展示了双曲与抛物型PDE在非线性层面的统一性。
We consider a vector-valued blow-up solution with values in $\mathbb{R}^m$ for the semilinear wave equation with power nonlinearity in one space dimension (this is a system of PDEs). We first characterize all the solutions of the associated stationary problem as an m-parameter family. Then, we show that the solution in self-similar variables approaches some particular stationary one in the energy norm, in the non-characteristic cases. Our analysis is not just a simple adaptation of the already handled real or complex case. In particular, there is a new structure of the set a stationary solutio…
We study the Cauchy problem for fully nonlinear (stochastic) parabolic partial differential equations. We provide both in deterministic and stochastic case the existence of a maximal defined solution for the problem and we provide suitable blow-up criterion. The key idea is the use of the paradifferential operator calculus in order to reduce the fully nonlinear problem into an abstract quasilinear (stochastic) parabolic equation. This allows us to use some recent results on abstract quasilinear (stochastic) evolution equations in Banach spaces. To do so, we analyse the properties of the paradi…
Delayed blow-up and enhanced diffusion by transport noise for systems of reaction-diffusion equations
本文研究带质量控制的反应-扩散方程组，证明适当乘性输运噪声可延迟强解爆破并增强扩散，在质量指数衰减时得到全局存在性。
For some deterministic nonlinear PDEs on the torus whose solutions may blow up in finite time, we show that, under suitable conditions on the nonlinear term, the blow-up is delayed by multiplicative noise of transport type in a certain scaling limit. The main result is applied to the 3D Keller-Segel, 3D Fisher-KPP and 2D Kuramoto-Sivashinsky equations, yielding long-time existence for large initial data with high probability.
Phase transition approach to detecting singularities of PDEs
提出一种将偏微分方程奇点出现视为相变的网格细化算法，通过三种方式计算爆破速率，并用无粘Burgers方程和超临界Schrödinger方程示例说明。
Branching process representation for nonlinear first-order conservation PDEs in 1D
本文提出一大类一维一阶守恒PDE可利用多类型分支过程进行概率表示，并证明在特定初始条件下可通过分支过程的临界条件识别梯度爆破时间。
The initial boundary-value problem (IBVP) and the Cauchy problem for the Kuramoto--Sivashinsky equation and other related $2m$th-order semilinear parabolic partial differential equations in one and N dimensions are considered. Global existence and blow-up as well as uniform bounds are reviewed by using: (i) classic tools of interpolation theory and Galerkin methods, (ii) eigenfunction and nonlinear capacity methods, (iii) Henry's version of weighted Gronwall's inequalities, and (vi) two types of scaling (blow-up) arguments. For the IBVPs, existence of global solutions is proved for both Dirich…
Characterising exchange of stability in scalar reaction-diffusion equations via geometric blow-up
本文通过几何爆破方法研究标量反应扩散方程中缓慢通过跨临界和叉形奇点时的稳定性交换，解决了谱简并问题，并将慢型不变流形延拓至奇点邻域，为偏微分方程动态分岔研究提供了新途径。
Uniqueness for the Dafermos regularization viscous wave fan profiles for Riemann solutions of scalar hyperbolic conservation laws
本文证明了标量双曲守恒律黎曼解的 Dafermos 正则化粘性波扇剖面解的唯一性，且不限于小自相似粘性区域，并给出了 Burgers 方程稀疏波正则化的精确描述。
Renormalization and blow ups for the nonlinear Schrödinger equation
本文利用动力系统中的重整化算子与先验界方法，将一维非线性薛定谔方程的初值问题转化为不动点问题，证明重整化不动点存在，从而得到有限时间能量爆破且相应范数有界的自相似解。
Blow-up in second and fourth order semi-linear parabolic partial differential equations (PDEs) is considered in bounded regions of one, two and three spatial dimensions with uniform initial data. A phenomenon whereby singularities form at multiple points simultaneously is exhibited and explained by means of a singular perturbation theory. In the second order case we pre- dict that points furthest from the boundary are selected by the dynamics of the PDE for singularity. In the fourth order case, singularities can form simultaneously at multiple locations, even in one spatial dimension. In two …
Rational neural networks for tracking complex singularities of nonlinear PDEs
该研究提出一种结合帕德激活单元（PAUs）的有理神经网络方法，可追踪非线性PDE的复杂奇点，通过三个典型PDE案例验证了其定位、追踪奇点及推断特征现象形成的性能。
This paper is a continuation of Part I of this project, where we developed a new local well-posedness theory for nonlinear stochastic PDEs with Gaussian noise. In the current Part II we consider blow-up criteria and regularization phenomena. As in Part I we can allow nonlinearities with polynomial growth, and rough initial values from critical spaces. In the first main result we obtain several new blow-up criteria for quasi- and semilinear stochastic evolution equations. In particular, for semilinear equations we obtain a Serrin type blow-up criterium, which extends a recent result of Prüss-Si…
The Riemann Problem for a 3x3 Generalized Chaplygin Gas System with Variable Pressure
该研究分析带可变压力的3×3广义Chaplygin气体守恒律系统的黎曼问题，构造奇异解并通过Dafermos原理筛选物理解，还证明孤立过压缩δ激波是自相似粘性剖面的零粘性极限。
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