A Petrov-Galerkin method for nonlocal convection-dominated diffusion problems
A Petrov-Galerkin method for nonlocal convection-dominated diffusion problems
复制标题
求解非局部对流主导扩散问题的 Petrov-Galerkin 方法
DOI:
10.1016/j.jcp.2021.110919
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发表时间:
2022
影响因子:
4.1
通讯作者:
Foster, John T.
中科院分区:
文献类型:
--
作者:
Leng, Yu;Tian, Xiaochuan;Demkowicz, Leszek;Gomez, Hector;Foster, John T.
We present a Petrov-Galerkin (PG) method for a class of nonlocal convection-dominated diffusion problems. There are two main ingredients in our approach. First, we define the norm on the test space as induced by the trial space norm, i.e., the optimal test norm, so that the inf-sup condition can be satisfied uniformly independent of the problem. We show the well-posedness of a class of nonlocal convection-dominated diffusion problems under the optimal test norm with general assumptions on the nonlocal diffusion and convection kernels. Second, following the framework of Cohen et al. (2012), we embed the original nonlocal convection-dominated diffusion problem into a larger mixed problem so as to choose an enriched test space as a stabilization of the numerical algorithm. In the numerical experiments, we use an approximate optimal test norm which can be efficiently implemented in 1d, and study its performance against the energy norm on the test space. We conduct convergence studies for the nonlocal problem using uniformh- andp-refinements, and adaptiveh-refinements on both smooth manufactured solutions and solutions with sharp gradient in a transition layer. In addition, we confirm that the PG method is asymptotically compatible, following the notion in Tian and Du (2014).
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DOI:
10.1016/j.cma.2018.08.016
发表时间:
2018-01
影响因子:
7.2
作者:
Nathaniel Trask;Huaiqian You;Yue Yu;M. Parks
通讯作者:
Nathaniel Trask;Huaiqian You;Yue Yu;M. Parks
影响因子:
7.2
作者:
Q. Du;Yunzhe Tao;Xiaochuan Tian;Jiang Yang
通讯作者:
Jiang Yang
影响因子:
2.9
作者:
Lee, Hwi;Du, Qiang
通讯作者:
Du, Qiang
DOI:
10.1137/19m1296720
发表时间:
2020-02
期刊:
SIAM Rev.
影响因子:
--
作者:
Xiaochuan Tian;Q. Du
通讯作者:
Xiaochuan Tian;Q. Du
影响因子:
3
作者:
Du, Qiang;Tian, Xiaochuan
通讯作者:
Tian, Xiaochuan