三维稳态向列型液晶方程的Liouville定理

本文证明若三维稳态向列型液晶方程的解u和d满足u,▽d∈L9/2,q(R3),3＜q＜∞,则u≡0,即满足Liouville型定理,其中u:R3→R3是速度场,d:R3→S2表示液晶分子的朝向.本文借鉴Galdi证明三维稳态不可压Navier-Stokes方程在空间L9/2(R3)中的Liouville定理的思路及Sc...     

带地形作用的正压方程组的Cauchy问题适定性(Ⅱ):粘性

带地形作用的粘性正压方程组不是Cauchy-Kowalewska型,但利用分层理论可证明它是稳定的,并且给出解空间的分层结构以及Cauchy问题适定性的判别标准．证明了在超平面{t=t^0}包含R^2上粘性正压方程组是不适定的。     

向量值柯西问题的适定性

设A为复Banach空间X上的稠定闭算子.我们证明了若抽象柯西问题具有C-适定性,则{λ∈C:Reλ≥0）　ρ（A）且存在C>0,使得任给λ∈C,Reλ≥0,都有（λ-A）-1≤C/1+　λ.因而A必为X上某一有界解析半群的无穷小生成元.对于定义在有限区间[0,T]上的抽象柯西问题,我们亦得到了类似的结果.     

带地形作用的正压方程组的Cauchy问题适定性(Ⅰ):无粘

带地形作用的无粘正压方程组是Cauchy-Kowalewska型,可用Cauchy-Kowalewska定理分析,但是分层理论给出更多的信息,例如该方程组是稳定的,该方程组的解空间结构以及Cauchy问题适定性的判别标准．证明了在超平面{t=t^1}包含R^2上粘性正压方程组是适定的。     

可压缩向列型液晶流体的适定性

本文研究多维(N 2)可压缩向列型液晶流体的Cauchy问题,在初始密度远离真空这个自然的条件下,借助于Littlewood-Paley理论和Schauder-Tychonoff不动点定理,在基于Lp框架下的临界Besov空间中证明大初值意义下可压缩向列型液晶模型强解的局部存在性和唯一性.     

一类广义层流方程初值问题的整体适定性

讨论了刻画层流问题中比重相近的层间相互作用的数学模型的初值问题.通过引进一类函数空间并证明该初值问题的解在所述空间上的一系列先验估计,得到了该初值问题在初值属于Hs(R)(s≥1)时的整体适定性.     

带有阻尼项的三维Boussinesq方程组解的适定性问题（英文）

本文研究带有阻尼项的三维Boussinesq方程组.在对初始值加最低正则性假设条件下,证明了强解的存在唯一性.     

一类广义层流方程组的初值问题的局部适定性

讨论层流理论中描述比重相近的层流间相互作用的方程组的广义方程组．通过引进一类函数空间和一系列先验估计,应用不动点原理,分别得到该类广义层流方程组的初值问题在H^s(R),s≥1的局部适定性．     

向量值优化问题的适定性

将向量值优化问题的适定性理论推广到具有W-距离的拟度量空间中,给出B-适定性及DH-适定性的概念,并得到相应的判别准则．定义一类非线性标量化函数,利用这类标量化函数的性质将向量值优化问题转化为标量值优化问题,得到原问题与标量化问题的适定性之间的等价关系．     

On the Uniqueness of Heat Flow of Harmonic Maps and Hydrodynamic Flow of Nematic Liquid Crystals

For any n-dimensional compact Riemannian manifold (M,g) without boundary and another compact Riemannian manifold (N,h), the authors establish the uniqueness of the heat flow of harmonic maps from M to N in the class C([0,T),W1,n). For the hydrodynamic flow (u,d) of nematic liquid crystals in dimensions n = 2 or 3, it is shown that the uniqueness holds for the class of weak solutions provided either (i) for n = 2, u ∈ Lt∞ L2x∩L2tHx1, ▽P∈ Lt4/3 Lx4/3 , and ▽d∈ L∞t Lx2∩Lt2Hx2; or (ii) for n = 3, u ∈ Lt∞ Lx2∩L2tHx1∩ C([0,T),Ln), P ∈ Ltn/2 Lxn/2 , and ▽d∈ L2tLx2 ∩ C([0,T),Ln). This answers affirmatively the uniqueness question posed by Lin-Lin-Wang. The proofs are very elementary.     

A Finite Element Algorithm for Nematic Liquid Crystal Flow Based on the Gauge-Uzawa Method

In this paper,we present a finite element algorithm for the time-dependent nematic liquid crystal flow based on the Gauge-Uzawa method.This algorithm combines the Gauge and Uzawa methods within a finite element variational formulation,which is a fully discrete projection type algorithm,whereas many projection methods have been studied without space discretization.Besides,error estimates for velocity and molecular orientation of the nematic liquid crystal flow are shown.Finally,numerical results are given to show that the presented algorithm is reliable and confirm the theoretical analysis.     

Local Well-Posedness for the Compressible Nematic Liquid Crystals Flow with Vacuum

In this paper we prove the local well-posedness of strong solutions to the compressible nematic liquid crystals flow with vacuum in a bounded domain $\Omega\subset \mathbb{R}^3$.     

Global well-posedness and twist-wave solutions for the inertial Qian–Sheng model of liquid crystals

We consider the inertial Qian–Sheng model of liquid crystals which couples a hyperbolic-type equation involving a second-order material derivative with a forced incompressible Navier–Stokes system. We study the energy law and prove a global well-posedness result. We further provide an example of twist-wave solutions, that is solutions of the coupled system for which the flow vanishes for all times.     

Well-posedness for the Heat Flow of Biharmonic Maps with Rough Initial Data

This paper establishes the local (or global, resp.) well-posedness of the heat flow of biharmonic maps from ℝ ⁿ to a compact Riemannian manifold without boundary for initial data with small local BMO (or BMO, resp.) norms.     

三维液晶方程一个与水平速度相关的改进正则性准则

根据速度的水平分量$u_h$的垂直导数,本文研究了3维液晶方程的整体正则性,具体地,当速度的水平分量$u_h$的垂直导数满足$\partial_3u_h\in L^p(0,T; R^3), \frac{2}{p}+\frac{3}{q}\le \frac{3}{2}$, $2\le p\le \infty$,则局部强解$(u,d)$可以光滑的延拓出$t=T$.