您当前所在位置: 首页 > 学者

苗长兴

  • 49浏览

  • 0点赞

  • 0收藏

  • 0分享

  • 9下载

  • 0评论

  • 引用

期刊论文

Global well-posedness for axisymmetric Boussinesq system with horizontal viscosity

Changxing MiaoXiaoxin Zheng

J. Math. Pures Appl.,2014,101(2): 842–872 | 2014年05月15日 | 10.1016/j.matpur.2013.10.007

URL:http://dx.doi.org/10.1016/j.matpur.2013.10.007

摘要/描述

Under the assumption that the support of the axisymmetric initial data $\\rho_{0}(r,z)$ does not intersect the axis $(Oz)$, we prove the global well-posedness for this system with axisymmetric initial data. We first show the growth of the quantity $\\frac\\rho r$ for large time by taking advantage of characteristic of transport equation. This growing property together with the horizontal smoothing effect enables us to establish $H^1$-estimate of the velocity via the $L^2$-energy estimate of velocity and the Maximum principle of density. Based on this, we further establish the estimate for the quantity $\\|\\omega(t)\\|_{\\sqrt{\\mathbb{L}}}:=\\sup_{2\\leq p<\\infty}\\frac{\\norm{\\omega(t)}_{L^p(\\mathbb{R}^3)}}{\\sqrt{p}}<\\infty$ which implies $\\|\\nabla u(t)\\|_{\\mathbb{L}^{\\frac{3}{2}}}:=\\sup_{2\\leq p<\\infty}\\frac{\\norm{\\nabla u(t)}_{L^p(\\mathbb{R}^3)}}{p\\sqrt{p}}<\\infty$. However, this regularity for the flow admits forbidden singularity since $ \\mathbb{L}$ (see \\eqref{eq-kl} for the definition) seems be the minimum space for the gradient vector field $u(x,t)$ ensuring uniqueness of flow. To bridge this gap, we exploit the space-time estimate about $ \\sup_{2\\leq p<\\infty}\\int_0^t\\frac{\\|\\nabla u(\\tau)\\|_{L^p(\\mathbb{R}^3)}}{\\sqrt{p}}\\mathrm{d}\\tau<\\infty$ by making good use of the horizontal smoothing effect and micro-local techniques. The global well-posedness for the large initial data is achieved by establishing a new type space-time logarithmic inequality.

【免责声明】以下全部内容由[苗长兴]上传于[2014年07月07日 20时05分50秒],版权归原创者所有。本文仅代表作者本人观点,与本网站无关。本网站对文中陈述、观点判断保持中立,不对所包含内容的准确性、可靠性或完整性提供任何明示或暗示的保证。请读者仅作参考,并请自行承担全部责任。

我要评论

全部评论 0

本学者其他成果

    同领域成果