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research article

Stabilized isogeometric formulation of the Stokes problem on overlapping patches

Wei, Xiaodong
•
Puppi, Riccardo  
•
Antolin, Pablo  
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November 16, 2023
Computer Methods In Applied Mechanics And Engineering

We present a novel stabilized isogeometric formulation for the Stokes problem, where the geometry of interest is obtained via overlapping NURBS (non-uniform rational B-spline) patches, i.e., one patch on top of another in an arbitrary but predefined hierarchical order. All the visible regions constitute the computational domain, whereas independent patches are coupled through visible interfaces using Nitsche's formulation. Such a geometric representation inevitably involves trimming, which may yield trimmed elements of extremely small measures (referred to as bad elements) and thus lead to the instability issue. Motivated by the minimal stabilization method that rigorously guarantees stability for trimmed geometries (Buffa et al., 2020), in this work we generalize it to the Stokes problem on overlapping patches. Central to our method is the distinct treatments for the pressure and velocity spaces: Stabilization for velocity is carried out for the flux terms on interfaces, whereas pressure is stabilized in all the bad elements. We provide a priori error estimates with a comprehensive theoretical study. Through a suite of numerical tests, we first show that optimal convergence rates are achieved, which consistently agrees with our theoretical findings. Second, we show that the accuracy of pressure is significantly improved by several orders using the proposed stabilization method, compared to the results without stabilization. Finally, we also demonstrate the flexibility and efficiency of the proposed method in capturing local features in the solution field.This contribution is dedicated to Thomas J.R. Hughes, as a tribute to his remarkable lifetime achievements.(c) 2023 Elsevier B.V. All rights reserved.

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Type
research article
DOI
10.1016/j.cma.2023.116477
Web of Science ID

WOS:001114228700001

Author(s)
Wei, Xiaodong
Puppi, Riccardo  
Antolin, Pablo  
Buffa, Annalisa  
Date Issued

2023-11-16

Publisher

Elsevier Science Sa

Published in
Computer Methods In Applied Mechanics And Engineering
Volume

417

Article Number

116477

Subjects

Technology

•

Physical Sciences

•

Boolean Operations

•

Stokes Problem

•

Minimal Stabilization

•

Boundary-Unfitted Method

•

Nitsche'S Method

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
MNS  
FunderGrant Number

National Natural Science Foundation of China

12202269

SNSF of Switzerland through the project "Design- through-Analysis (of PDEs)

40B2-0 187094

European Union

862025

Available on Infoscience
February 23, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/205187
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