arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1003.5830nlin.PSphysics.bio-phq-bio.OT
收藏

可激发介质中螺旋波的大核极限:数值方法

The large core limit of spiral waves in excitable media: A numerical approach

Sebastian Hermann, Georg A. Gottwald

摘要:

本文对Beyn & Thuemmler在2004年提出的冻结法进行了改进,用于分析可激发介质中的刚性旋转螺旋波。该方法的目的是稳定地确定旋转螺旋的旋转频率和核心半径,以及在无界域的螺旋波的近似形状。特别是,我们引入螺旋波边界条件的基础上的几何近似的螺旋波解决方案的阿基米德螺线和渐开线的圆。我们进一步提出了一个简单的实施边界条件的情况下,当抑制剂是非扩散的,以前引起寄生振荡的情况下。然后,我们利用该方法进行数值分析的大核心限制。所提出的方法使我们能够调查接近临界的情况下,螺旋波获得无限的核心半径和零旋转频率,然后才开始发展成缩回的手指。我们确认的线性标度制度的漂移分岔的旋转频率和核心半径的螺旋波解决方案接近临界。这一制度是无法达到与传统的数值方法。

英文摘要:

We modify the freezing method introduced by Beyn & Thuemmler, 2004, for analyzing rigidly rotating spiral waves in excitable media. The proposed method is designed to stably determine the rotation frequency and the core radius of rotating spirals, as well as the approximate shape of spiral waves in unbounded domains. In particular, we introduce spiral wave boundary conditions based on geometric approximations of spiral wave solutions by Archimedean spirals and by involutes of circles. We further propose a simple implementation of boundary conditions for the case when the inhibitor is non-diffusive, a case which had previously caused spurious oscillations. We then utilize the method to numerically analyze the large core limit. The proposed method allows us to investigate the case close to criticality where spiral waves acquire infinite core radius and zero rotation frequency, before they begin to develop into retracting fingers. We confirm the linear scaling regime of a drift bifurcation for the rotation frequency and the core radius of spiral wave solutions close to criticality. This regime is unattainable with conventional numerical methods.

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。

↑