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arXiv 1604.04798math.AP
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多孔介质中燃烧模型的Cauchy问题

The Cauchy problem for a combustion model in porous media

J. C. da Mota, M. M. Santos, R. A. Santos

摘要:

证明了一类非线性反应扩散方程组与常微分方程耦合的Cauchy问题整体解的存在性。该系统模拟了燃烧前沿在两层多孔介质中的传播,如J.C. da Mota和S. Schecter,《双层多孔介质中的燃烧前沿》,Journal of Dynamics and微分方程,18(3)(2006)。对于两层燃料浓度为已知函数的特殊情况,柯西问题由J. C。da Mota和M. M. Santos,An application of the monotone迭代法to a combustion problem in porous media,Nonlinear Analysis:Real World Application,12(2010)。对于完整的系统,其中的燃料浓度也是未知的功能,我们构建了一个迭代计划,其中包含一个序列,收敛到系统的解决方案,在当地的时间,在初始数据的条件下,持有人连续,有界和非负的功能。对于某些$p\in(1,\infty)$,如果初始时间在Lebesgue空间$L^p$中,我们还证明了整体解的存在性.此外,对于广泛的一类反应扩散系统,我们表明,非负象限是一个正不变的区域,因此,经典解的类似系统,与反应功能是非减少在一个未知的和半lipscthitz连续的,是有界的上下解的任何正时间,如果他们是在时间零。

英文摘要:

We prove the existence of a global solution to the Cauchy problem for a nonlinear reaction-diffusion system coupled with a system of ordinary differential equations. The system models the propagation of a combustion front in a porous medium with two layers, as derived by J. C. da Mota and S. Schecter in Combustion fronts in a porous medium with two layers, Journal of Dynamics and Differential Equations, 18(3) (2006). For the particular case, when the fuel concentrations in both layers are known functions, the Cauchy problem was solved by J. C. da Mota and M. M. Santos in An application of the monotone iterative method to a combustion problem in porous media, Nonlinear Analysis: Real World Application, 12 (2010). For the full system, in which the fuel concentrations are also unknown functions, we construct an iterative scheme that contains a sequence which converges to a solution of the system, locally in time, under the conditions that the initial data are Holder continuous, bounded and nonnegative functions. We also show the existence of a global solution, if the initial date are additionally in the Lebesgue space $L^p$, for some $p\in(1,\infty)$. Furthermore, for a broad class of reaction-diffusion systems we show that the non negative quadrant is a positively invariant region, and, as a consequence, that classical solutions of similar systems, with the reactions functions being non decreasing in one unknown and semi-lipscthitz continuous in the other, are bounded by lower and upper solutions for any positive time if so they are at time zero.

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