Parallel iterative stabilized finite element algorithms for the Navier-Stokes equations with nonlinear slip boundary conditions

Based on full domain partition technique, some parallel iterative pressure projection stabilized finite element algorithms for the Navier-Stokes equations with nonlinear slip boundary conditions are designed and analyzed. In these algorithms, the lowest equal-orderP(1) - P(1)elements are used for finite element discretization and a local pressure projection stabilized method is used to counteract the invalidness of the discrete inf-sup condition. Each subproblem is solved on a global composite mesh with the vast majority of the degrees of freedom associated with the particular subdomain that it is responsible for and hence can be solved in parallel with other subproblems by using an existing sequential solver without extensive recoding. All of the subproblems are nonlinear and are independently solved by three kinds of iterative methods. We estimate the optimal error bounds of the approximate solutions with the use of some (strong) uniqueness conditions. Numerical results are also given to demonstrate the effectiveness of the parallel algorithms.