Large-time geometrical properties of solutions of the Barenblatt equation of elasto-plastic filtration

Large-time geometrical properties of solutions of the Barenblatt equation of elasto-plastic filtration
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弹塑性过滤Barenblatt方程解的大时间几何性质

DOI:
10.1016/j.jde.2011.12.010
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发表时间:
2012-04
影响因子:
2.4
通讯作者:
Vazquez Juan L.
Vazquez Juan L.
中科院分区:
数学2区
文献类型:
--
作者:
Huang Yong;Vazquez Juan L.

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当初始数据是非负的、连续的、紧支撑的时,我们研究了如下方程在全空间RN中的解的大倍几何行为,其中N为⩾1。我们证明了,在有限时间后,log(U)成为空间变量中的凹函数,并且收敛到某一抛物型的所有可微阶,即所谓的Barenblatt型轮廓,这在Kamin等人中得到了描述。(1991)[20]。考虑了对更一般的完全非线性方程的推广。
We study the geometric behavior for large times of the solutions of the following equation posed in the whole space RN, for N⩾1 when the initial data are nonnegative, continuous and compactly supported. We prove that, after a finite time, log(u) becomes a concave function in the space variable and converges to all orders of differentiability to a certain parabolic shape, so-called Barenblatt-type profile, which was described in Kamin et al. (1991) [20]. Extensions to more general fully nonlinear equations are considered.
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