Applications of Mathematics, Vol. 62, No. 4, pp. 377-403, 2017
A penalty method for the time-dependent Stokes problem with the slip boundary condition and its finite element approximation
Guanyu Zhou, Takahito Kashiwabara, Issei Oikawa
Received November 28, 2016. First published July 5, 2017.
Abstract: 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.
Keywords: penalty method; Stokes problem; finite element method; error estimate
Affiliations: Guanyu Zhou, Department of Applied Mathematics, The Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-Ku, Tokyo, 162-8601 Japan, e-mail: email@example.com, firstname.lastname@example.org; Takahito Kashiwabara, The Graduate School of Mathematical Sciences, The University of Tokyo, 3-8-1 Komaba Meguro-ku Tokyo 153-8914, Japan, e-mail: email@example.com; Issei Oikawa, Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, 169-8555 Tokyo, Japan, e-mail: firstname.lastname@example.org