Sandpiles with bistable automata rules: Towards a minimal model of pedestal formation and structure
Sandpiles with bistable automata rules: Towards a minimal model of pedestal formation and structure
复制标题
DOI：
10.1103/physrevlett.89.255001
复制
发表时间：
2002-12-16
影响因子：
8.6
通讯作者：
Rosenbluth, MN
中科院分区：
文献类型：
--
作者：
Gruzinov, I;Diamond, PH;Rosenbluth, MN
提出了一个具有两个稳定和两个不稳定坡度范围的沙桩，作为研究h型基座形成和动力学的最小模型。观察到，随着沉积物的增加，基座形成并向内膨胀。输运分岔对基座形成并不重要，尽管用第二种硬稳定边界得到的基座结构在性质上不同于标准砂堆。观察到非周期性粒子抛射事件，但不会引发基座坍塌。基座的形成改变了运输雪崩的频谱。
A sandpile with two stable and two unstable ranges of slopes is presented as a minimal model for the study of H-mode pedestal formation and dynamics. Pedestals are observed to form and expand inward with increasing deposition. Transport bifurcation is not critical to pedestal formation, though the pedestal structure obtained with a second, hard stability boundary is qualitatively different from that found in standard sandpiles. Nonperiodic particle ejection events are observed, but do not initiate pedestal collapse. Pedestal formation alters the spectrum of transport avalanches.