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arXiv 2103.03907math.AP
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星形网络上广义Benjamin-Bona-Mahony-Burgers方程的质量守恒形式

A Mass-Conserving Formulation of the Generalized Benjamin-Bona-Mahony-Burgers Equation on Star Networks

A. George Morgan

摘要:

广义Benjamin-Bona-Mahony-Burgers方程(gBBMB)描述了血液通过长的粘弹性动脉的流动。在这篇文章中,我们介绍了gBBMB有效的半无限边连接在一个单一的路口,与网络的边缘对应的动脉树的一段网络上的制定。为了反映血管材料特性的突然变化,允许gBBMB的系数在网络的每个边缘上取不同的值。重要的是,我们的公式确保了gBBMB的解决方案的总质量在时间上是恒定的,即使在耗散的存在下。我们还建立了当地的时间适定性的充分经常的初始数据,这个新的配方。然后,我们展示了如何使用能量方法将局部解扩展到对所有正时间有效的解,只要对模型PDE和网络的参数施加一定的约束。为了直观地了解波如何从具有两个边缘的网络的中心结散射,我们展示了一些数值模拟的结果。

英文摘要:

The generalized Benjamin-Bona-Mahony-Burgers equation (gBBMB) describes the flow of blood through a long, viscoelastic artery. In this article we introduce a formulation of gBBMB valid on networks with semi-infinite edges joined at a single junction, with the network's edges corresponding to a segment of the arterial tree. To reflect sudden changes in the material properties of blood vessels, the coefficients of gBBMB are allowed to take different values on each edge of the network. Critically, our formulation ensures that the total mass of the solution to gBBMB is constant in time, even in the presence of dissipation. We also establish local-in-time well-posedness of this new formulation for sufficiently regular initial data. Then, we show how energy methods can be used to extend the local solution to a solution valid for all positive times, provided certain constraints are imposed on the parameters of the model PDE and the network. To build intuition for how waves scatter off the central junction of a network with two edges, we demonstrate the results of some numerical simulations.

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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