700 research outputs found
Nonconforming mortar element methods: Application to spectral discretizations
Spectral element methods are p-type weighted residual techniques for partial differential equations that combine the generality of finite element methods with the accuracy of spectral methods. Presented here is a new nonconforming discretization which greatly improves the flexibility of the spectral element approach as regards automatic mesh generation and non-propagating local mesh refinement. The method is based on the introduction of an auxiliary mortar trace space, and constitutes a new approach to discretization-driven domain decomposition characterized by a clean decoupling of the local, structure-preserving residual evaluations and the transmission of boundary and continuity conditions. The flexibility of the mortar method is illustrated by several nonconforming adaptive Navier-Stokes calculations in complex geometry
Π‘ΠΊΡΠ½ΡΠ΅Π½Π½ΠΎ-Π³ΡΠ°Π½ΠΈΡΠ½ΠΎΠ΅Π»Π΅ΠΌΠ΅Π½ΡΠ½Π° ΡΡ Π΅ΠΌΠ° ΠΌΠ΅ΡΠΎΠ΄Ρ Π΄Π΅ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΡΡ ΠΎΠ±Π»Π°ΡΡΡ Π΄Π»Ρ ΠΏΠ»ΠΎΡΠΊΠΈΡ Π·Π°Π΄Π°Ρ ΡΠ΅ΠΎΡΡΡ ΠΏΡΡΠΆΠ½ΠΎΡΡΡ Π· Π½Π΅ΡΡΠΌΡΡΠ½ΠΈΠΌΠΈ ΡΠΎΠ·Π±ΠΈΡΡΡΠΌΠΈ ΠΏΡΠ΄ΠΎΠ±Π»Π°ΡΡΠ΅ΠΉ
Π ΠΎΠ·Π³Π»ΡΠ΄Π°ΡΡΡΡΡ ΡΠ·Π°Π³Π°Π»ΡΠ½Π΅Π½Π½Ρ ΠΏΠ°ΡΠ°Π»Π΅Π»ΡΠ½ΠΎΡ ΠΠ΅ΠΉΠΌΠ°Π½Π°-ΠΠ΅ΠΉΠΌΠ°Π½Π° ΡΠ° ΠΏΠΎΡΠ»ΡΠ΄ΠΎΠ²Π½ΠΎΡ ΠΡΡΡΡ
Π»Π΅-ΠΠ΅ΠΉΠΌΠ°Π½Π° ΡΡ
Π΅ΠΌ ΠΌΠ΅ΡΠΎΠ΄Ρ Π΄Π΅ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΡΡ ΠΎΠ±Π»Π°ΡΡΡ Π΄Π»Ρ ΠΏΠ»ΠΎΡΠΊΠΎΡ Π·Π°Π΄Π°ΡΡ ΡΠ΅ΠΎΡΡΡ ΠΏΡΡΠΆΠ½ΠΎΡΡΡ Π·Π° Π½Π΅ΡΡΠΌΡΡΠ½ΠΈΡ
ΡΡΡΠΎΠΊ Π½Π° ΠΌΠ΅ΠΆΡ ΠΏΡΠ΄ΠΎΠ±Π»Π°ΡΡΠ΅ΠΉ. ΠΠ· Π²ΠΈΠΊΠΎΡΠΈΡΡΠ°Π½Π½ΡΠΌ ΠΌΠΎΡΡΠ°ΡΠ½ΠΈΡ
Π΅Π»Π΅ΠΌΠ΅Π½ΡΡΠ² ΡΠΌΠΎΠ²ΠΈ ΡΠ΄Π΅Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΌΠ΅Ρ
Π°Π½ΡΡΠ½ΠΎΠ³ΠΎ ΠΊΠΎΠ½ΡΠ°ΠΊΡΡ ΠΏΡΠ΄ΠΎΠ±Π»Π°ΡΡΠ΅ΠΉ Π½Π°Π±Π»ΠΈΠΆΠ°ΡΡΡΡΡ ΡΠ»Π°Π±ΠΊΠΈΠΌΠΈ ΡΠΌΠΎΠ²Π°ΠΌΠΈ. Π§ΠΈΡΠ»ΠΎΠ²Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΈ ΠΎΡΡΠΈΠΌΠ°Π½Ρ Π· Π²ΠΈΠΊΠΎΡΠΈΡΡΠ°Π½Π½ΡΠΌ Π»ΡΠ½ΡΠΉΠ½ΠΈΡ
Π³ΡΠ±ΡΠΈΠ΄Π½ΠΈΡ
ΡΠΊΡΠ½ΡΠ΅Π½Π½ΠΎ-Π³ΡΠ°Π½ΠΈΡΠ½ΠΎΠ΅Π»Π΅ΠΌΠ΅Π½ΡΠ½ΠΈΡ
Π°ΠΏΡΠΎΠΊΡΠΈΠΌΠ°ΡΡΠΉ. ΠΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½ΠΎ ΡΠΊΡΡΡΡ Π½Π°Π±Π»ΠΈΠΆΠ΅Π½ΠΎΠ³ΠΎ ΡΠΎΠ·Π²βΡΠ·ΠΊΡ Π²ΡΠ΄ ΠΊΡΠ»ΡΠΊΠΎΡΡΡ ΠΌΠΎΡΡΠ°ΡΠ½ΠΈΡ
Π΅Π»Π΅ΠΌΠ΅Π½ΡΡΠ² Ρ ΠΉΠΎΠ³ΠΎ Π·Π±ΡΠΆΠ½ΡΡΡΡ ΠΏΡΠΈ Π·Π³ΡΡΠ΅Π½Π½Ρ Π½Π΅ΡΡΠΌΡΡΠ½ΠΈΡ
ΡΡΡΠΎΠΊ ΠΌΠ΅ΡΠΎΠ΄Ρ ΡΠΊΡΠ½ΡΠ΅Π½Π½ΠΈΡ
Π΅Π»Π΅ΠΌΠ΅Π½ΡΡΠ² Ρ ΠΏΡΡΠΌΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Ρ Π³ΡΠ°Π½ΠΈΡΠ½ΠΈΡ
Π΅Π»Π΅ΠΌΠ΅Π½ΡΡΠ².A generalization of parallel Neumann-Neumann and sequential Dirichlet-Neumann domain decomposition schemes for a plane elasticity problem with nonconforming meshes on the common boundary of subdomains is proposed. These schemes are based on approximation of ideal mechanical contact conditions of subdomains by weak contact conditions using the mortar element method. Numerical solution is obtained by using linear hybrid finite-boundary element approximation. The quality of the approximate solution depending on a number of mortar elements and its convergence in nonconforming meshes of the method of finite elements and the direct method of boundary-value elements are investigated.ΠΠ°Π½ΠΎ ΠΎΠ±ΠΎΠ±ΡΠ΅Π½ΠΈΠ΅ ΠΏΠ°ΡΠ°Π»Π»Π΅Π»ΡΠ½ΠΎΠΉ ΠΠ΅ΠΉΠΌΠ°Π½Π°-ΠΠ΅ΠΉΠΌΠ°Π½Π° ΠΈ ΠΏΠΎΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΠ΅Π»ΡΠ½ΠΎΠΉ ΠΠΈΡΠΈΡ
Π»Π΅-ΠΠ΅ΠΉΠΌΠ°Π½Π° ΡΡ
Π΅ΠΌ ΠΌΠ΅ΡΠΎΠ΄Π° Π΄Π΅ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΈΠΈ ΠΎΠ±Π»Π°ΡΡΠΈ Π΄Π»Ρ ΠΏΠ»ΠΎΡΠΊΠΎΠΉ Π·Π°Π΄Π°ΡΠΈ ΡΠ΅ΠΎΡΠΈΠΈ ΡΠΏΡΡΠ³ΠΎΡΡΠΈ Π² ΡΠ»ΡΡΠ°Π΅ Π½Π΅ΡΠΎΠ²ΠΌΠ΅ΡΡΠ½ΡΡ
ΡΠ΅ΡΠΎΠΊ Π½Π° ΠΎΠ±ΡΠ΅ΠΉ Π³ΡΠ°Π½ΠΈΡΠ΅ ΠΏΠΎΠ΄ΠΎΠ±Π»Π°ΡΡΠ΅ΠΉ. Π’Π°ΠΊΠΎΠ΅ ΠΎΠ±ΠΎΠ±ΡΠ΅Π½ΠΈΠ΅ ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΎ Π½Π° ΠΏΡΠΈΠ±Π»ΠΈΠΆΠ΅Π½ΠΈΠΈ ΡΡΠ»ΠΎΠ²ΠΈΠΉ ΠΈΠ΄Π΅Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΊΠΎΠ½ΡΠ°ΠΊΡΠ° ΠΏΠΎΠ΄ΠΎΠ±Π»Π°ΡΡΠ΅ΠΉ ΡΠ»Π°Π±ΡΠΌΠΈ ΡΡΠ»ΠΎΠ²ΠΈΡΠΌΠΈ Ρ ΠΏΠΎΠΌΠΎΡΡΡ ΠΌΠ΅ΡΠΎΠ΄Π° ΠΌΠΎΡΡΠ°ΡΠ½ΡΡ
ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ². Π§ΠΈΡΠ»Π΅Π½Π½ΠΎΠ΅ ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΎ Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ Π»ΠΈΠ½Π΅ΠΉΠ½ΡΡ
Π³ΠΈΠ±ΡΠΈΠ΄Π½ΡΡ
ΠΊΠΎΠ½Π΅ΡΠ½ΠΎ-Π³ΡΠ°Π½ΠΈΡΠ½ΠΎ-ΡΠ»Π΅ΠΌΠ΅Π½ΡΠ½ΡΡ
Π°ΠΏΠΏΡΠΎΠΊΡΠΈΠΌΠ°ΡΠΈΠΉ. ΠΠ·ΡΡΠ΅Π½Ρ Π²Π»ΠΈΡΠ½ΠΈΠ΅ Π½Π° ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π° ΠΌΠΎΡΡΠ°ΡΠ½ΡΡ
ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ², ΡΡ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΡ ΡΠ΅ΡΠ΅Π½ΠΈΡ ΠΏΡΠΈ ΡΠ³ΡΡΠ΅Π½ΠΈΠΈ ΠΈ ΡΠ±Π»ΠΈΠΆΠ΅Π½ΠΈΠΈ Π½Π΅ΡΠΎΠ²ΠΌΠ΅ΡΡΠ½ΡΡ
ΡΠ΅ΡΠΎΠΊ
Structure-preserving mesh coupling based on the Buffa-Christiansen complex
The state of the art for mesh coupling at nonconforming interfaces is
presented and reviewed. Mesh coupling is frequently applied to the modeling and
simulation of motion in electromagnetic actuators and machines. The paper
exploits Whitney elements to present the main ideas. Both interpolation- and
projection-based methods are considered. In addition to accuracy and
efficiency, we emphasize the question whether the schemes preserve the
structure of the de Rham complex, which underlies Maxwell's equations. As a new
contribution, a structure-preserving projection method is presented, in which
Lagrange multiplier spaces are chosen from the Buffa-Christiansen complex. Its
performance is compared with a straightforward interpolation based on Whitney
and de Rham maps, and with Galerkin projection.Comment: 17 pages, 7 figures. Some figures are omitted due to a restricted
copyright. Full paper to appear in Mathematics of Computatio
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