## A combined conjugate gradient-multigrid algorithm for the numerical solution of the Stokes problem.(English)Zbl 0563.76028

The finite-element discretization of the Stokes problem in a bounded domain $$\Omega$$ leads to an equation $$Lp=g$$ for the pressure, where L is a symmetric, positive definite, bounded linear operator in $$L^ 2(\Omega)$$. This equation is solved by a conjugate-gradient algorithm. Evaluating Lp requires the solution of two discrete Poisson equations by a multigrid algorithm. The resulting iterative process has a convergence rate bounded away from one, independently of the meshsize, and computed between 0.8 and 0.93 by numerical experiments.
Reviewer: M.Boudouvides

### MSC:

 76D05 Navier-Stokes equations for incompressible viscous fluids 76-04 Software, source code, etc. for problems pertaining to fluid mechanics 76M99 Basic methods in fluid mechanics
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