An antimaximum principle for a degenerate parabolic problem

An antimaximum principle for a degenerate parabolic problem
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简并抛物线问题的反极大值原理

DOI:
10.57262/ade/1355854621
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发表时间:
2010
影响因子:
1.4
通讯作者:
Lourdes Tello
Lourdes Tello
中科院分区:
数学4区
文献类型:
--
作者:
J. F. Padial;P. Takáč;Lourdes Tello

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我们提出了一个数学处理的一个重要的例子,非牛顿流体的流动,发生在一个模型研究渗透的水通过岩石或桑迪坝。该模型与多孔介质模型有很大区别。在这里,非线性现象由p-Laplacian Δpu div(|u| p 2 u)。我们处理下面的p-Laplacian的Dirichlet问题,其谱参数l在第一特征值l1附近:8 > > u t Δpu = l| u| p2 u+ f(x,t),(x,t)2 Ω dad(0,T∞); u(x,t)= 0,(x,t)2 Ω dad(0,T∞); u(x,0)= u0(x),x2 Ω.这里,1 0足够小,则存在某个时间T2(0,T∞)使得问题(1)的每个解对于所有x2 Ω和所有t2(T,T∞)都满足u(x,t)> 0。
We present a mathematical treatment of an important example of a non- Newtonian fluid flow that occurs in a model studying the penitration of water through rocky or sandy dams. This model differs from porous medium models significantly. Here, the nonlinear phenomena are described by the p-Laplacian Δpu div(|∇u| p 2 ∇u). We treat the following Dirichlet problem for the p-Laplacian with a spectral parameter l near the first eigenvalue l1: 8 > > ¶ u ¶ t Δpu = l|u| p 2 u+ f(x,t), (x,t)2 Ω◊(0, T∞); u(x,t) = 0, (x,t)2 ¶ Ω◊(0, T∞); u(x, 0) = u0(x), x2 Ω. Here, 1 0 is small enough, then there is some time T2 (0, T∞) such that every solution of problem (1) satisfies u(x,t) > 0 for all x2 Ω and all t2 (T, T∞).