Design and analysis of an exactly divergence-free hybridised discontinuous Galerkin method for incompressible flows on meshes with quadrilateral cells
Design and analysis of an exactly divergence-free hybridised discontinuous Galerkin method for incompressible flows on meshes with quadrilateral cells
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四边形单元网格上不可压缩流动的精确无散杂化间断伽辽金方法的设计与分析
DOI:
10.1016/j.cma.2023.116493
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发表时间:
2023
影响因子:
7.2
通讯作者:
Dean J
中科院分区:
文献类型:
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作者:
Dean J
We generalise a hybridised discontinuous Galerkin method for incompressible flow problems to non-affine cells, showing that with a suitable element mapping the generalised method preserves a key invariance property that eludes most methods, namely that any irrotational component of the prescribed force is exactly balanced by the pressure gradient and does not affect the velocity field. This invariance property can be preserved in the discrete problem if the incompressibility constraint is satisfied in a sufficiently strong sense. We derive sufficient conditions to guarantee discretely divergence-free functions are exactly divergence-free and give examples of divergence-free finite elements on meshes with triangular, quadrilateral, tetrahedral, or hexahedral cells generated by a (possibly non-affine) map from their respective reference cells. In the case of quadrilateral cells, we prove an optimal error estimate for the velocity field that does not depend on the pressure approximation. Our analysis is supported by numerical results.
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影响因子:
1.8
作者:
E. L. Peters;John A. Evans
通讯作者:
John A. Evans
影响因子:
2.1
作者:
John A. Evans;T. Hughes
通讯作者:
John A. Evans;T. Hughes
DOI:
10.1137/16m1083839
发表时间:
2016
期刊:
SIAM J. Numer. Anal.
影响因子:
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作者:
S. Rhebergen;G. N. Wells
通讯作者:
G. N. Wells
影响因子:
2.1
作者:
J. Maljaars
通讯作者:
J. Maljaars
DOI:
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发表时间:
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期刊:
影响因子:
--
作者:
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