  A rich galaxy cluster showing strong resemblance with the observed ones is
simulated. Cold dark matter spectrum, Gaussian statistics, flat universe, and
two components -- baryonic gas plus dark matter particles -- are considered. We
have calculated the gravitational-wave output during the epoch of the fully
nonlinear and nonsymmetric cluster evolution. The amplitudes and frequencies of
the resulting gravitational waves are estimated. Since frequencies are very
small --of the order of $10^{-17} Hz$ -- a complete pulse cannot be observed
during an admissible integration time; nevertheless, it is proved that these
waves can produce an interesting secular effect which appears to be observable
with current technology.
