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arXiv 1504.05067math.AP
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具有分数阶Laplacian算子的正则化三维Boussinesq方程

The regularized 3D Boussinesq equations with fractional Laplacian and no diffusion

Hakima Bessaih, Benedetta Ferrario

摘要:

本文研究三维正则化Boussinesq方程。通过在非线性项和$β$ -分数拉普拉斯算子中的$α$阶的平滑核来正则化速度方程;我们考虑临界情况$α+β=\frac{5}{4}$,并假设$\frac 12 <β<\frac 54$。温度方程是一个纯输运方程,其中输运速度通过相同的$α$阶平滑核正则化。当初速度为$H^r$,初温度为$H^{r-β}$时,证明了$r>\max(2β,β+1)$的整体适定性.这个正则性足以证明解的唯一性。我们还证明了一个连续的依赖于初始条件的解决方案。

英文摘要:

In this paper, we study the 3D regularized Boussinesq equations. The velocity equation is regularized à la Leray through a smoothing kernel of order $α$ in the nonlinear term and a $β$-fractional Laplacian; we consider the critical case $α+β=\frac{5}{4}$ and we assume $\frac 12 <β<\frac 54$. The temperature equation is a pure transport equation, where the transport velocity is regularized through the same smoothing kernel of order $α$. We prove global well posedness when the initial velocity is in $H^r$ and the initial temperature is in $H^{r-β}$ for $r>\max(2β,β+1)$. This regularity is enough to prove uniqueness of solutions. We also prove a continuous dependence of the solutions on the initial conditions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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