Geodesic
A penalty method for the time-dependent Stokes problem with the slip boundary condition and its finite element approximation
Applications of Mathematics, Tome 62 (2017) no. 4, pp. 377-403.

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We consider the finite element method for the time-dependent Stokes problem with the slip boundary condition in a smooth domain. To avoid a variational crime of numerical computation, a penalty method is introduced, which also facilitates the numerical implementation. For the continuous problem, the convergence of the penalty method is investigated. Then we study the fully discretized finite element approximations for the penalty method with the P1/P1-stabilization or P1b/P1 element. For the discretization of the penalty term, we propose reduced and non-reduced integration schemes, and obtain an error estimate for velocity and pressure. The theoretical results are verified by numerical experiments.
DOI : 10.21136/AM.2017.0328-16
Classification : 35Q30, 65N30
Keywords: penalty method; Stokes problem; finite element method; error estimate 
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     title = {A penalty method for the time-dependent {Stokes} problem with the slip boundary condition and its finite element approximation},
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Zhou, Guanyu; Kashiwabara, Takahito; Oikawa, Issei. A penalty method for the time-dependent Stokes problem with the slip boundary condition and its finite element approximation. Applications of Mathematics, Tome 62 (2017) no. 4, pp. 377-403. doi : 10.21136/AM.2017.0328-16. http://geodesic.mathdoc.fr/articles/10.21136/AM.2017.0328-16/

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