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关于欧拉方程弱解的流体压力双Hölder正则性的注记

A note for double Hölder regularity of the hydrodynamic pressure for weak solutions of Euler equations

Shanghai Jiao Tong University(上海交通大学)

Siran Li, Ya-Guang Wang

AI总结:

本文通过标准椭圆PDE技术,证明了欧拉方程弱解在有界域内流体压力的双Hölder正则性。

摘要:

我们为欧拉方程在有界$C^2$域$Ω\subset \mathbb{R}^d$($d\geq 3$)内的弱解的流体压力的内部双Hölder正则性提供了一个简单证明;即,对于速度$u \in C^{0,γ}(Ω;\mathbb{R}^d)$,其中$0<γ<1/2$,我们证明压力$p \in C^{0,2γ}_{\rm int}(Ω)$。这受到数学流体动力学中湍流和异常耗散研究的启发,最近在[C. W. Bardos, D. W. Boutros, and E. S. Titi, Hölder regularity of the pressure for weak solutions of the 3D Euler equations in bounded domains, Arch. Rational Mech. Anal. 249 (2025), 28]中通过伪微分算子方法在$C^{2,1}$域上建立。我们的方法仅涉及标准椭圆PDE技术,并依赖于在[C. W. Bardos, D. W. Boutros, and E. S. Titi, Hölder regularity of the pressure for weak solutions of the 3D Euler equations in bounded domains, Arch. Rational Mech. Anal. 249 (2025), 28]中引入的修改压力变种以及[L. Silvestre, unpublished notes]中的势估计。我们证明的关键新成分是引入了两个截断函数,其局部化参数被精心选择为到$\partialΩ$的距离的幂。

英文摘要:

We give an elementary proof for the interior double Hölder regularity of the hydrodynamic pressure for weak solutions of the Euler Equations in a bounded $C^2$-domain $Ω\subset \mathbb{R}^d$; $d\geq 3$. That is, for velocity $u \in C^{0,γ}(Ω;\mathbb{R}^d)$ with some $0<γ<1/2$, we show that the pressure $p \in C^{0,2γ}_{\rm int}(Ω)$. This is motivated by the studies of turbulence and anomalous dissipation in mathematical hydrodynamics and, recently, has been established in [L. De Rosa, M. Latocca, and G. Stefani, Int. Math. Res. Not. 2024.3 (2024), 2511--2560] over $C^{2,1}$-domains by means of pseudodifferential calculus. Our approach involves only standard elliptic PDE techniques, and relies on a variant of the modified pressure introduced in [C. W. Bardos, D. W. Boutros, and E. S. Titi, Hölder regularity of the pressure for weak solutions of the 3D Euler equations in bounded domains, Arch. Rational Mech. Anal. 249 (2025), 28] and the potential estimates in [L. Silvestre, unpublished notes]. The key novel ingredient of our proof is the introduction of two cutoff functions whose localisation parameters are carefully chosen as a power of the distance to $\partialΩ$.

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