Enhanced dissipation for two-dimensional Hamiltonian flows
Enhanced dissipation for two-dimensional Hamiltonian flows
复制标题
二维哈密顿流的增强耗散
DOI:
--
复制
发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Elio Marconi
中科院分区:
文献类型:
--
作者:
Elia Brué;Michele Coti Zelati;Elio Marconi
Let $H\in C^1\cap W^{2,p}$ be an autonomous, non-constant Hamiltonian on a compact $2$-dimensional manifold, generating an incompressible velocity field $b=\nabla^\perp H$. We give sharp upper bounds on the enhanced dissipation rate of $b$ in terms of the properties of the period $T(h)$ of the close orbits $\{H=h\}$. Specifically, if $0<\nu\ll 1$ is the diffusion coefficient, the enhanced dissipation rate can be at most $O(\nu^{1/3})$ in general, the bound improves when $H$ has isolated, non-degenerate elliptic point. Our result provides the better bound $O(\nu^{1/2})$ for the standard cellular flow given by $H_\mathsf{c}(x)=\sin x_1 \sin x_2$, for which we can also prove a new upper bound on its mixing mixing rate and a lower bound on its enhanced dissipation rate. The proofs are based on the use of action-angle coordinates and on the existence of a good invariant domain for the regular Lagrangian flow generated by $b$.
登录
查看更多内容
影响因子:
1.3
作者:
Gautam Iyer;Xiaoqian Xu;Andrej Zlatoš
通讯作者:
Gautam Iyer;Xiaoqian Xu;Andrej Zlatoš
影响因子:
1.7
作者:
Albritton, Dallas;Beekie, Rajendra;Novack, Matthew
通讯作者:
Novack, Matthew
影响因子:
2
作者:
Bedrossian, Jacob;Blumenthal, Alex;Punshon-Smith, Sam
通讯作者:
Punshon-Smith, Sam
DOI:
10.2422/2036-2145.201911_013
发表时间:
2021
期刊:
ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE
影响因子:
--
作者:
Coti Zelati, Michele;D. Drivas, Theodore
通讯作者:
D. Drivas, Theodore