Abstract
In this paper, we discuss and analyze virtual element approximations for the nonstationary Stokes problem on polygonal meshes. The proposed scheme is based on pressure-velocity formulations, and the virtual element spaces associated with velocity and pressure are constructed in a way that they obey the discrete inf-sup (LBB) condition. The spatial discretization for velocity is based on piecewise linear polynomials as well as non-linear functions, and the pressure approximation is relied on discontinuous piecewise constant polynomials, whereas a backward Euler method is employed for the time discretization. By introducing suitable energy and \(L^2\) projection operators, the optimal error estimates are established in \(H^1\) and \(L^2\) norms for both semi and fully discrete schemes under the minimal regularity assumptions on continuous solutions. Moreover, several numerical experiments are conducted to validate the obtained theoretical rate of convergence and exhibit the performance of the proposed scheme.
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Acknowledgements
We thank the valuable comments by the anonymous reviewer, whose suggestions lead to numerous improvements to the manuscript. We also would like to thank Prof. David Mora (Departamento de Matemática, Universidad del Bío-Bío, Concepción, Chile) and Prof. Ricardo Ruiz-Baier (Monash University, Australia) for their kind support and helping in the implementation. This work was partially supported by the Department of Science and Technology (DST-SERB), India through MATRICS Grant MTR/2019/000519 and Core Research Grant CRG/2019/003863).
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Verma, N., Kumar, S. Lowest order virtual element approximations for transient Stokes problem on polygonal meshes. Calcolo 58, 48 (2021). https://doi.org/10.1007/s10092-021-00440-7
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DOI: https://doi.org/10.1007/s10092-021-00440-7
Keywords
- Stokes equation
- Lowest order scheme
- Inf-sup conditions
- Convergence analysis
- Virtual element approximations
- Mixed formulations
- Numerical experiments