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arXiv 1011.0171math.AP
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推广二维Navier-Stokes方程和地面准地转方程的耗散模式

Dissipative models generalizing the 2D Navier-Stokes and the surface quasi-geostrophic equations

Dongho Chae, Peter Constantin, Jiahong Wu

摘要:

研究了一类分数阶耗散的活动标量方程的全局(时间)正则性问题。速度场$u$的每个分量由有源标量$θ$到$\mathcal{R} Λ^{-1} P(Λ) θ$确定,其中$\mathcal{R}$表示Riesz变换,$Λ=(-Δ)^{1/2}$和$P(Λ)$表示傅立叶乘法算子族。二维Navier-Stokes涡度方程对应于特殊情况$P(Λ)=I$,而地面准地转(SQG)方程对应于$P(Λ) =Λ$。我们得到了一类方程的整体正则性,其中要求$P(Λ)$和耗散拉普拉斯算子的分数幂满足一个显式条件。特别地,具有任意分数阶耗散和对任意$γ>0$具有$P(Λ)= (\log(I-Δ))^γ$的有源标量方程是全局正则的.

英文摘要:

This paper is devoted to the global (in time) regularity problem for a family of active scalar equations with fractional dissipation. Each component of the velocity field $u$ is determined by the active scalar $θ$ through $\mathcal{R} Λ^{-1} P(Λ) θ$ where $\mathcal{R}$ denotes a Riesz transform, $Λ=(-Δ)^{1/2}$ and $P(Λ)$ represents a family of Fourier multiplier operators. The 2D Navier-Stokes vorticity equations correspond to the special case $P(Λ)=I$ while the surface quasi-geostrophic (SQG) equation to $P(Λ) =Λ$. We obtain the global regularity for a class of equations for which $P(Λ)$ and the fractional power of the dissipative Laplacian are required to satisfy an explicit condition. In particular, the active scalar equations with any fractional dissipation and with $P(Λ)= (\log(I-Δ))^γ$ for any $γ>0$ are globally regular.

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