Time integration for extended discontinuous Galerkin methods with moving domains
Time integration for extended discontinuous Galerkin methods with moving domains
复制标题
具有移动域的扩展间断伽辽金方法的时间积分
DOI:
10.1002/nme.5634
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发表时间:
2018
影响因子:
2.9
通讯作者:
Thomas
中科院分区:
文献类型:
--
作者:
Kummer;Florian;Müller;Björn;Thomas
We study time integration schemes for discontinuous Galerkin discretizations of problems with moving immersed interfaces. Two approaches have been discussed in literature so far: splitting schemes and space‐time methods. Splitting schemes are cheap and easy to implement, but are non‐conservative, inherently limited to low orders of accuracy, and require extremely small time steps. Space‐time methods, on the other hand, are conservative, allow for large time steps, and generalize to arbitrary orders of accuracy. However, these advantages come at the expense of a severe growth the systems to be solved. Within this work, we present a generic strategy that combines the advantages of both concepts by evaluating numerical fluxes in a moving reference frame and by making use of a conservative cell‐agglomeration strategy. We study the performance of this strategy in combination with backward‐difference‐formulas and explicit Runge‐Kutta schemes in the context of the scalar transport equation, the Burgers equation, and the heat equation. Our results indicate that higher order spatial and temporal convergence rates can be achieved without increasing the size of the systems to be solved.
影响因子:
2.9
作者:
F. Kummer
通讯作者:
F. Kummer
影响因子:
2.9
作者:
R. Kramer;D. Noble
通讯作者:
D. Noble
影响因子:
2.9
作者:
Müller;Krämer-Eis;Kummer;Oberlack
通讯作者:
Oberlack