@TechReport{ it:2015-036,
author = {Owe Axelsson and Shiraz Farouq and Maya Neytcheva},
title = {A Preconditioner for Optimal Control Problems, Constrained
by {S}tokes Equation with a Time-Harmonic Control},
institution = {Department of Information Technology, Uppsala University},
department = {Division of Scientific Computing},
year = {2015},
number = {2015-036},
month = dec,
abstract = {In an earlier paper preconditioning of stationary
Stokes-constrained optimal control problems has been
considered.
In this article we construct an efficient preconditioner
for solving the algebraic systems arising from discretized
optimal control problems with time-periodic Stokes
equations. A simplified analysis of the derivation of the
preconditioner and its properties is presented. The
reconditioner is fully parameter independent and the
condition number of the corresponding preconditioned matrix
is bounded by $2$. The o-constructed preconditioner is
favourably compared with another preconditioner for the
same problem.}
}